CN101656591B - Wavelength division multiplex transmission system - Google Patents
Wavelength division multiplex transmission system Download PDFInfo
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- CN101656591B CN101656591B CN2009101711512A CN200910171151A CN101656591B CN 101656591 B CN101656591 B CN 101656591B CN 2009101711512 A CN2009101711512 A CN 2009101711512A CN 200910171151 A CN200910171151 A CN 200910171151A CN 101656591 B CN101656591 B CN 101656591B
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Abstract
The invention relates to a wavelength division multiplex transmission system, comprising a wideband light source, an optical circulator, 2Nx1(de) multiplexer, two wavelength interleaver, N Fabry-Perot laser diode, and N optical receiver, characterized in that the N Fabry-Perot laser diode are connected with odd-number ports of the (de) multiplexers, the N optical receiver are connected with even-number ports of the (de) multiplexers, common ports of the (de) multiplexers are connected with a first port of a first wavelength interleaver, a second port of the first wavelength interleaver is connected with a second port of the optical circulator, a first port of the optical circulator is connected with the wideband light source, a third port of the optical circulator is connected with a second port of the second wavelength interleaver, and a third port of the second wavelength interleaver is connected with a third port of the first wavelength interleaver.
Description
The application at the application number that on April 29th, 2005 submitted to is: 2005100689918, denomination of invention is: the dividing an application of " wavelengthtunable light source and use the wave division multiplexing transmission system of this light source ".
Technical field
The present invention relates to provide the light source of wavelength selectivity output.More specifically, the present invention relates to its output wavelength can be by wavelength-division multiplex (WDM) transmission system of the wavelengthtunable light source of external control and this light source of use.
Background technology
Providing the light source of output by specific wavelength is wherein according to the wavelength of each channel, to distinguish one of the critical component of the wave division multiplexing transmission system of each channel.
In order to minimize the interference between adjacent channel, the light source of wave division multiplexing transmission system should have stable wavelength and enough septate mode rejection ratios (SMSR).Also wish to have high output power and narrow line width.
In meeting the prior art of the demand, distributed feedback laser diode (DFBLD) is representative light source.
But DFBLD is very expensive, and needs complicated control procedure that its output wavelength is fixed on a specified point.Use wideband light source to replace the spectrum segmenting system of specified wavelength light source to confirm to have reduced cost and the complicacy of system.
Incoherent wideband light source (ILS), as light emitting diode (LED), superluminescent diode (SLD) and the emission image intensifer through amplified spont-aneous emission, is the representative light source for the spectrum segmenting system., because with distributed feedback laser diode, compare and can simplify the wavelength control process, so use the spectrum segmenting system of these light sources, be very attractive.
United States Patent (USP) 5,440,417 (System for spectrum-sliced fiber amplifierlight for multi-channel wavelength-division-multiplexedapplications) disclose and have used the image intensifer light source to carry out the method that spectrum is cut apart.And United States Patent (USP) 5,694,234 (Wavelength division multiplexing passiveoptical network including broadcast overlay) disclose and have used the directly spectrum segmenting system of modulation LED.
But they also have some shortcomings.For example, LED or SLD provide enough output powers hardly, and the external modulator that the image intensifer light source need to be expensive, and let it be to the greatest extent, and output power is relatively large.
In other words, United States Patent (USP) 5,440, the external modulator that the system that proposes in 417 need to be added, and the system that proposes in United States Patent (USP) 5,694,234 almost can not provide enough output powers.
On the other hand, the adjustable wavelength light source has improved the functional of wave division multiplexing transmission system.
Control the output wavelength that can adjust distributed feedback laser diode (DFBLD) by temperature, but the wavelengthtunable scope is only the about several nanometers in 1270～1600nm wave band (the common low-loss wavelength period that contains the silicon dioxide single-mode fiber).
Therefore, mainly studied the wavelengthtunable light source that uses external cavity in prior art, still, they are expensive and equipment need to be complicated is adjusted output wavelength.
Summary of the invention
The problem that the present invention solves above-mentioned prior art is proposed.The present invention proposes the wavelengthtunable light source of use Fabry-Perrault (Fabry-Perot) type laser diode and the wave division multiplexing transmission system of this light source of use.
Fabry-Perrault type laser diode is compared the output power that can provide higher with SLD with LED, and to compare manufacturing relative simple with distributed feedback laser diode (DFBLD).But because it is the multimode light source, it not yet is used to wave division multiplexing transmission system.
But, Korean Patent 1003256870000 (A light source forwavelength-division multiplexed telecommunication system using aFabry-Perot laser diode wavelength-locked by an injectedincoherent light, registered at Feb.8,2002) proposed by obtain the method for wavelength selectivity output with Fabry-Perrault type laser diode.By from outside, narrow band light being injected into Fabry-Perrault type laser diode, the septate mode rejection ratio has increased, and can obtain the high-output power of certain wave strong point.
As mentioned above, wavelengthtunable light source according to the present invention is constituted as and can adjusts output wavelength by controlling the outside light wavelength of injecting.
In addition,, by controlling the temperature of Fabry-Perrault type laser diode, can optimize the characteristic of wavelengthtunable light source, as septate mode rejection ratio, noise attribute and output power.
Description of drawings
Fig. 1 is the schematic diagram according to wavelengthtunable light source embodiment of the present invention.
Fig. 2 is for the schematic diagram of measurement according to the experimental provision of the characteristic of wavelengthtunable light source embodiment of the present invention.
Fig. 3 a～Fig. 3 c is the spectrum that experimental provision shown in Figure 2 is measured.
Fig. 4 a～Fig. 4 b is the spectrum of being measured together by experimental provision shown in Figure 2 and different optical filters.
Fig. 5 a is the experimental provision for the eye pattern of the spectrum segmenting system of measuring prior art, and Fig. 5 b is for the experimental provision of measuring according to the eye pattern of light source of the present invention.
Fig. 6 a and Fig. 6 b are the eye patterns of being measured by the experimental provision shown in Fig. 5 a and Fig. 5 b respectively.
Fig. 7 is the first embodiment according to wave division multiplexing transmission system of the present invention.
Fig. 8 is the second embodiment according to wave division multiplexing transmission system of the present invention.
Fig. 9 is the 3rd embodiment according to wave division multiplexing transmission system of the present invention.
Figure 10 is the 4th embodiment according to wave division multiplexing transmission system of the present invention.
Figure 11 is the 5th embodiment that uses according to the wave division multiplexing transmission system of light source of the present invention.
The label of＜accompanying drawing major part (symbol) illustrates 〉
100: optical transmission system
BLS: wideband light source
EDFA: two-stage Erbium-Doped Fiber Amplifier (EDFA)
(D) MUX1:2N * 1 multichannel (going) multiplexer
(D) MUX2:N * 1 multichannel (going) multiplexer
DR: laser diode driver circuit
EM: external modulator
EMDR: external modulator driving circuit
FPLD: Fabry-Perrault type laser diode
IL: cross device
OC: light gyroscope
OSA: spectroanalysis instrument
OSC: oscillograph
RX: optical receiver
TBPF: variable band-pass filter
TEC: temperature controller
WDM: wavelength division multiplexer
Embodiment
Below,, with reference to accompanying drawing, specifically describe structure and the principle of work of the embodiment of the present invention.
As shown in Figure 1, wavelengthtunable light source according to the present invention comprises wideband light source (BLS), variable band-pass filter (TBPF), light gyroscope and Fabry-Perrault type laser diode.
Here, wideband light source is any one in incoherent light source (as optical amplifier fiber, semiconductor optical amplifier, light emitting diode and the superluminescent diode of emission through amplified spont-aneous emission) or coherent source Supercontinuum source.
It is desirable to, Fabry-Perrault type laser diode (FPLD) should not comprise the optoisolator that injects for efficiency light.
Variable band-pass filter (TBPF) is the light by injecting optionally.
Fabry-Perrault type laser diode (FPLD) is to it, not inject the multimode light source of exterior light, if but from outside, to it, inject light, in the mode of oscillation of Fabry-Perrault type laser diode, pattern in the scope of injecting light will be exported relatively high power, and the pattern outside this scope is with suppressed.
Thereby, by the light gyroscope (OC) that is connected with Fabry-Perrault type laser diode (FPLD), exported wavelength selectivity output.
Here, because the output wavelength of light source is definite by the light that is injected in Fabry-Perrault type laser diode (FPLD), so can adjust this output wavelength by the passband of controlling variable band-pass filter (TBPF).
The wavelength of the cavity modes of Fabry-Perrault type laser diode (FPLD) changes according to the temperature of Fabry-Perrault type laser diode.
Utilize this specific character,, by controlling the temperature of Fabry-Perrault type laser diode (FPLD), can control the characteristic such as the wavelengthtunable light source of septate mode rejection ratio, noisiness, output power and output spectrum.
In addition,, by controlling the electric current of Fabry-Perrault type laser diode (FPLD), also can control the characteristic such as the wavelengthtunable light source of septate mode rejection ratio, noisiness, output power and output spectrum.
The output power of wavelengthtunable light source changes with the bias current that is applied to Fabry-Perrault type laser diode (FPLD).
Therefore, not only can be by with external modulator but also can directly modulate the wavelengthtunable light source.
If to Fabry-Perrault type laser diode (FPLD), apply suitable electric current, the output generation polarization of wavelengthtunable light source, but the injection light of reflection can be unpolarized.
, according to this specific character, by the output port at light gyroscope (OC), Polarization Controller and polarizer are installed additionally and can be improved the extinction ratio of modulated light signal.
In other words, by the output power for wanting maximized wavelengthtunable light source, control Polarization Controller, can maximize the extinction ratio of the output of wavelengthtunable light source.
In light source according to the present invention, make with light gyroscope (OC) and reduce light insertion consume.
But,, even with low cost optical power mixer, replace light gyroscope (OC), also can obtain having the light source of similar characteristic.
Fig. 2 shows for the experimental provision of measuring according to the characteristic of wavelengthtunable light source embodiment of the present invention.
Use two-stage Erbium-Doped Fiber Amplifier (EDFA) (EDFA) as wideband light source (BLS) in Fig. 1, and use Fabry-Perrault type etalon filter as variable band-pass filter (TBPF).
Two-stage Erbium-Doped Fiber Amplifier (EDFA) (EDFA) output is through amplified spont-aneous emission (ASE), and this spontaneous radiation is the incoherent light that band is wider than 30nm.
Three dB bandwidth is approximately the Fabry of 2.5GHz-Perrault type etalon filter (FPEF) optionally by Erbium-Doped Fiber Amplifier (EDFA) (EDFA) output, and by applying voltage, can control passband.
The power that is injected into the incoherent light of Fabry-Perrault type laser diode (FPLD) by light gyroscope (OC) is-2dBm that the threshold current of Fabry-Perrault type laser diode (FPLD) is 10mA, to it, has applied the bias current of 17mA.
The cavity length of Fabry-Perrault type laser diode (FPLD) is approximately 400 μ m, and intermode is apart from being approximately 100GHz, and it is equivalent to 40 times of three dB bandwidth of Fabry-Perrault type etalon filter (FPEF).
OSA represents spectroanalysis instrument in the drawings.
Fig. 3 a has shown in the situation that inject the output spectrum of the Fabry measure-Perrault type laser diode (FPLD) without ASE, Fig. 3 b has shown the spectrum that is injected into the light in Fabry-Perrault type laser diode, and Fig. 3 c has shown the output spectrum of the wavelengthtunable light source after the light that injects respectively Fig. 3 b to the wavelengthtunable light source.
The peak wavelength that is injected into the light in Fabry-Perrault type laser diode (FPLD) is respectively 1530nm, 1545nm and 1560nm, and the temperature of Fabry-Perrault type laser diode (FPLD) is configured to make the septate mode rejection ratio that measures in Fig. 3 c maximum in all cases.
After light injected, Fabry-Perrault type laser diode provided the wavelength with specific wavelength to select output according to injecting light wavelength.The septate mode rejection ratio that measures is greater than 30dB, and output power is approximately 0dBm.
Therefore, can notice that light source according to the present invention provides the output of the arrowband with about wavelengthtunable scope greater than 30nm.
Fig. 4 a is the spectrum of being measured together by experimental provision shown in Figure 2 and different optical filters, and its three dB bandwidth is approximately 100GHz.
The centre wavelength of wave filter is approximately 1558.8nm.
Here, the three dB bandwidth of wave filter is equivalent to the intermode distance of Fabry-Perrault type laser diode (FPLD).In a word, when the light of several times that with three dB bandwidth is the intermode distance of Fabry-Perrault type laser diode is injected in Fabry-Perrault type laser diode, can realize according to light source of the present invention.
Fig. 4 b is the spectrum of being measured by same experimental provision, but has adjusted the temperature of Fabry-Perrault type laser diode, so that inject the mid point of the centre wavelength of light corresponding to two cavity modess.
In this case, described light source provides wavelength selectivity output.
Intensity noise (intensity noise) for the Fabry according to wavelengthtunable light source of the present invention-incoherent light that Perrault type laser diode (FPLD) can suppress to inject.
That is to say, as the article at Jae-Seung Lee (" Signal-to-noise ratiomeasurement of a 2.5-Gb/s spectrum-sliced incoherent lightchannel ", IEEE Photon.Technol.Lett., Vol.1, no.1, pp.94-96,1997) propose in, the incoherent light that spectrum is cut apart has large intensity noise.
The performance of spectrum segmenting system that this intensity noise is deteriorated.
In wavelengthtunable light source according to the present invention, Fabry-Perrault type laser diode has suppressed the intensity noise of the incoherent light that injects.
As shown in Figure 5, can build test unit and confirm this characteristic.
Experimental provision shown in Fig. 5 a is used for existing spectrum segmenting system, it uses to attach has the external modulator (EM) of variable band-pass filter (TBPF) to modulate the incoherent wave filter in arrowband, and uses subsequently oscillograph (OSC) to measure its eye pattern.
Experimental provision shown in Fig. 5 b is used for according to wavelengthtunable light source of the present invention, it is injected into incoherent light in Fabry-Perrault type laser diode (FPLD), directly modulate Fabry-Perrault type laser diode, and use subsequently oscillograph (OSC) to measure its eye pattern.
Three dB bandwidth is about the Fabry of 2.5GHz-Perrault etalon filter (FPEF) and is used as variable band-pass filter (TBPF).
In both cases, modulation bit rate is 622Mb/s, and the pseudorandom block signal (PRBS) that is applied to external modulator or Fabry-Perrault type laser diode (FPLD) is 2
31-1.
Fig. 6 a and Fig. 6 b have shown respectively the eye pattern of measuring in both cases., with reference to this two width figure, can notice that wavelengthtunable light source according to the present invention has suppressed the intensity noise of incoherent light.
As described above, can be used for the various application of wave division multiplexing transmission system according to wavelengthtunable light source of the present invention.
Fig. 7 has shown the first embodiment that uses according to the wave division multiplexing transmission system of light source of the present invention, and it exports N first group of wavelength-division-multiplexed optical signal (λ by optical fiber
1, λ
3..., λ
2N-1), and receive N the second group of wavelength-division-multiplexed optical signal (λ that inputs by optical fiber
2, λ
4..., λ
2N).
As shown in Figure 7, wave division multiplexing transmission system according to the present invention comprise N Fabry-Perrault type laser diode (FPLD1, FPLD2 ..., FPLDn), a N laser diode driver circuit (DR
1, DR
2DRn), a N laser diode temperature controller (TEC1, TEC2 ... TECn), N optical receiver (RX1, RX2 ..., RXn), 2N * 1 (going) multiplexer ((D) MUX1), (going) multiplexer temperature controller (TEC), two cross device (IL1, IL2), a light gyroscope (OC), an and wideband light source (BLS).
(going) multiplexer ((D) MUX1) carries out demultiplexing and exports them by 2N input/output end port respectively the wavelength-division-multiplexed optical signal of inputting by public port.Perhaps, it carries out multiplexing to the light signal with different wave length of inputting by 2N input/output end port respectively, and by public port, exports them.
First group of light signal (λ
1, λ
3..., λ
2N-1) and second group of light signal (λ
2, λ
4..., λ
2N) wavelength to be configured to be cross one another.First group of light signal (λ
1, λ
3..., λ
2N-1) can the public port of (going) multiplexer ((D) MUX1) and odd number port (1,3 ..., 2N-1) between transmission, and second group of light signal (λ
2, λ
4..., λ
2N) can the public port of (going) multiplexer and even number port (2,4 ..., 2N) between the transmission.
Wideband light source (BLS) emission broadband light.
The light signal that light gyroscope (OC) is inputted by the first port by the second port output, and by the light signal of the 3rd port output by the second port input.
Cross device (IL1, IL2) transmits first group of light signal (λ between the first port and the second port
1, λ
3..., λ
2N-1) and block second group of light signal (λ
2, λ
4..., λ
2N), on the other hand, second group of light signal (λ of transmission between the first port and the 3rd port
2, λ
4..., λ
2N) and block first group of light signal (λ
1, λ
3..., λ
2N-1).
The connection of above-mentioned transmission system (100) can be performed as follows:
N Fabry-Perrault type laser diode (FPLD1, FPLD2, FPLDn) be connected with the odd number port of (going) multiplexer ((D) MUX1) respectively, N optical receiver (RX1, RX2 ..., RXn) be connected with the even number port of (going) multiplexer ((D) MUX1) respectively.
The public port of (going) multiplexer ((D) MUX1) is connected with the first port of the first cross device (IL1), the second port of the first cross device (IL1) is connected with the second port of light gyroscope (OC), the first port of described smooth gyroscope (OC) is connected with wideband light source (BLS), and the 3rd port of described smooth gyroscope (OC) is connected with the second port of second wave length interleaver (IL2).
The 3rd port of the 3rd port of the first cross device (IL1) and second wave length interleaver (IL2) interconnects, and the first port of second wave length interleaver (IL2) becomes the output port of transmission system (100).
Consider the principle of work of transmission system (100), wideband light source (BLS) emission broadband light, the light of described emission then is transfused to by the first port of light gyroscope (OC), by the second port, and then be imported in the second port of the first cross device (IL1).
Then, the first cross device (IL1) is by the part in the broadband light of the first port output input.
Output from the first cross device (IL1) is imported in the public port of (going) multiplexer ((D) MUX1), and is output by odd number port corresponding to (going) multiplexer ((D) MUX1) respectively.
Output from (going) multiplexer ((D) MUX1) is input to respectively N Fabry-Perrault type laser diode (FPLD1, FPLD2, FPLDn), then, and then N Fabry-Perrault type laser diode (FPLD1, FPLD2,, FPLDn) the first group light signal (λ of difference output wavelength in the passband of the odd number port of (going) multiplexer ((D) MUX1)
1, λ
3..., λ
2N-1).
First group of light signal (λ
1, λ
3..., λ
2N-1) undertaken multiplexingly by (going) multiplexer ((D) MUX1), then be imported in the first port of the first cross device (IL1).
Be input to first group of light signal (λ in the first port of the first cross device (IL1)
1, λ
3..., λ
2N-1) by the second port, be output,, through the second port and the 3rd port of light gyroscope (OC), then be imported into the second port of second wave length interleaver (IL2), be output with the first port by second wave length interleaver (IL2).
Be input to second group of light signal (λ in the first port of second wave length interleaver (IL2)
2, λ
4..., λ
2N) by the 3rd port, be output, then be imported into the 3rd port of the first cross device (IL1),, by the first port, to be output, be imported into thereafter the public port of (going) multiplexer ((D) MUX1).
The second group of light signal (λ that inputs by public port
2, λ
4..., λ
2N) be output by the corresponding even number port of (going) multiplexer ((D) MUX1), then respectively by N optical receiver (RX1, RX2 ..., RXn) receive.
Here, transmission system (100) can also comprise for N Fabry-Perrault type laser diode (FPLD1 of modulation, FPLD2, FPLDn) N laser diode driver circuit (DR1, DR2,, DRn), be used for N Fabry-Perrault type laser diode (FPLD1, FPLD2, the N that temperature FPLDn) is controlled laser diode temperature controller (TEC1, TEC2 ... and be used for the temperature controller (TEC) that the temperature of (going) multiplexer ((D) MUX1) is controlled TECn).
Fig. 8 shows the second embodiment that uses according to the wave division multiplexing transmission system of wavelengthtunable light source of the present invention, and it exports N the 3rd group of wavelength-division-multiplexed optical signal (λ by optical fiber
1, λ
2..., λ
N), and receive N the 4th group of wavelength-division-multiplexed optical signal (λ that inputs by optical fiber
N+1, λ
N+2..., λ
2N).
as shown in Figure 8, wave division multiplexing transmission system according to the present invention comprises N Fabry-Perrault type laser diode (FPLD1, FPLD2, FPLDn), N laser diode driver circuit (DR1, DR2, DRn), N laser diode temperature controller (TEC1, TEC2, TECn), N optical receiver (RX1, RX2, RXn), 2N * 1 (going) multiplexer ((D) MUX1), (going) multiplexer temperature controller (TEC), two wavelength division multiplexer (WDM1, WDM2), a light gyroscope (OC), an and wideband light source (BLS).
(going) multiplexer ((D) MUX1) carries out demultiplexing and exports them by 2N input/output end port respectively the light signal of inputting by public port.Perhaps, it carries out multiplexing to the light signal with different wave length of inputting by 2N input/output end port respectively, and by public port, exports them.
The 3rd group of light signal (λ
1, λ
2..., λ
N) and the 4th group of light signal (λ
N+1, λ
N+2..., λ
2N) wavelength be separately positioned on different wavelength period.The 3rd group of light signal (λ
1, λ
2..., λ
N) can transmit between the N port at the public port and the 1st of (going) multiplexer ((D) MUX1), and the 4th group of light signal (λ
N+1, λ
N+2..., λ
2N) can transmit between the 2N port at public port and the N+1 of (going) multiplexer.
Wideband light source (BLS) emission broadband light.
The light signal that light gyroscope (OC) is inputted by the first port by the second port output, and by the light signal of the 3rd port output by the second port input.
Wavelength division multiplexer (WDM1, WDM2) transmits the 3rd group of light signal (λ between the first port and the second port
1, λ
2..., λ
N) and block the 4th group of light signal (λ
N+1, λ
N+2..., λ
2N), on the other hand, they transmit the 4th group of light signal (λ between the first port and the 3rd port
N+1, λ
N+2..., λ
2N) and block the 3rd group of light signal (λ
1, λ
2..., λ
N).
The connection of above-mentioned transmission system (100) can be performed as follows:
N Fabry-Perrault type laser diode (FPLD1, FPLD2, FPLDn) be connected to the N port with the 1st of (going) multiplexer ((D) MUX1) respectively, N optical receiver (RX1, RX2 ..., RXn) be connected to the 2N port with the N+1 of (going) multiplexer ((D) MUX1) respectively.
The public port of (going) multiplexer ((D) MUX1) is connected with the first port of first wave division multiplexer (WDM1), the second port of first wave division multiplexer (WDM1) is connected with the second port of light gyroscope (OC), the first port of light gyroscope (OC) is connected with wideband light source (BLS), and the 3rd port of light gyroscope (OC) is connected with the second port of Second Wave division multiplexer (WDM2).
The 3rd port of the 3rd port of first wave division multiplexer (WDM1) and Second Wave division multiplexer (WDM2) interconnects, and the first port of Second Wave division multiplexer (WDM2) becomes the output port of transmission system (100).
Consider the principle of work of transmission system (100), the output of wideband light source (BLS) is transfused to by the first port of light gyroscope (OC),, by the second port, then is imported into the second port of first wave division multiplexer (WDM1).
Then, first wave division multiplexer (WDM1) is by the part in the broadband light of the first port output input.
Be imported into the public port of (going) multiplexer ((D) MUX1) from the output of first wave division multiplexer (WDM1), and the 1st to the n port, being output of the correspondence by (going) multiplexer ((D) MUX1) respectively.
Output from (going) multiplexer ((D) MUX1) is input to respectively N Fabry-Perrault type laser diode (FPLD1, FPLD2, FPLDn) in, then, N Fabry-Perrault type laser diode (FPLD1, FPLD2,, FPLDn) respectively output wavelength (going) multiplexer ((D) MUX1) the 1st to the 3rd group of light signal (λ in the passband of N port
1, λ
2..., λ
N).
The 3rd group of light signal (λ
1, λ
2..., λ
N) undertaken multiplexingly by (going) multiplexer ((D) MUX1), then be imported in the first port of first wave division multiplexer (WDM1).
Be input to the 3rd group of light signal (λ of first wave division multiplexer (WDM1)
1, λ
2..., λ
N) by the second port, be output, the second port and the 3rd port through light gyroscope (OC), then be imported in the second port of Second Wave division multiplexer (WDM2), with the first port by Second Wave division multiplexer (WDM2), be output.
Be input to the 4th group of light signal (λ in the first port of Second Wave division multiplexer (WDM2)
N+1, λ
N+2..., λ
2N) by the 3rd port, be output, then be imported in the 3rd port of first wave division multiplexer (WDM1),, by the first port, to be output, then be imported in the public port of (going) multiplexer ((D) MUX1).
Then, the signal of inputting by public port is output to the 2N port by the N+1 of the correspondence of (going) multiplexer ((D) MUX1), then respectively by the optical receiver (RX1, the RX2 that are connected with these ports,, RXn) receive.
Here, transmission system (100) can also comprise for N Fabry-Perrault type laser diode (FPLD1 of modulation, FPLD2, FPLDn) N laser diode driver circuit (DR1, DR2,, DRn), be used for N Fabry-Perrault type laser diode (FPLD1, FPLD2, the N that temperature FPLDn) is controlled laser diode temperature controller (TEC1, TEC2 ... and be used for the actuator temperature controller (TEC) that the temperature of (going) multiplexer ((D) MUX1) is controlled TECn).
Fig. 9 shows the 3rd embodiment that uses according to the wave division multiplexing transmission system of light source of the present invention, and it exports N the 5th group of wavelength-division-multiplexed optical signal (λ by optical fiber
1, λ
2..., λ
N), and receive N the 6th group of wavelength-division-multiplexed optical signal (λ that inputs by optical fiber
N+1, λ
N+2..., λ
2N).
As shown in Figure 9, wave division multiplexing transmission system according to the present invention comprise N Fabry-Perrault type laser diode (FPLD1, FPLD2 ..., FPLDn), a N laser diode driver circuit (DR
1, DR
2..., DRn), a N laser diode temperature controller (TEC1, TEC2 ..., TECn), a N optical receiver (RX1, RX2,, RXn), N * 1 (going) multiplexer ((D) MUX2), (going) multiplexer temperature controller (TEC), a N+2 wavelength division multiplexer (WDM1, WDM2, WDMn+1, WDMn+2), a light gyroscope (OC), an and wideband light source (BLS).
(going) multiplexer ((D) MUX2) carries out demultiplexing to the wavelength-division-multiplexed optical signal of inputting by public port, and exports them by N input/output end port respectively.Perhaps, it carries out multiplexing to the light signal with different wave length of inputting by N input/output end port respectively, and by public port, exports them.Here, the signal transmission characteristics between public port and each input/output end port repeats by I (arbitrary integer) wavelength interval doubly of the Free Spectral Range of (going) multiplexer ((D) MUX2).
The 5th group of light signal (λ
1, λ
2..., λ
N) and the 6th group of light signal (λ
N+1, λ
N+2..., λ
2N) wavelength be respectively set to and be in different wavelength period.The 5th group of light signal (λ
1, λ
2..., λ
N) and the 6th group of light signal (λ
N+1, λ
N+2..., λ
2N) can transmit between the public port of (going) multiplexer ((D) MUX2) and N port, still, the 5th group of light signal (λ
1, λ
2..., λ
N) and the 6th group of light signal (λ
N+1, λ
N+2..., λ
2N) wavelength be configured to respectively I (arbitrary integer) interval doubly of the Free Spectral Range of apart (going) multiplexer ((D) MUX2).
Wideband light source (BLS) emission broadband light.
The light signal that light gyroscope (OC) is inputted by the first port by the second port output, and by the light signal of the 3rd port output by the second port input.
Wavelength division multiplexer (WDM1 ..., WDMn+1, WDMn+2) and the 5th group of light signal (λ of transmission between the first port and the second port
1, λ
2..., λ
N) and block the 6th group of light signal (λ
N+1, λ
N+2..., λ
2N), on the other hand, they transmit the 6th group of light signal (λ between the first port and the 3rd port
N+1, λ
N+2..., λ
2N) and block the 5th group of light signal (λ
1, λ
2..., λ
N).
The connection of above-mentioned transmission system (100) can be performed as follows:
N the input/output end port of (going) multiplexer ((D) MUX2) respectively with N wavelength division multiplexer (WDM3, WDMn+1, WDMn+2) the first port is connected, N Fabry-Perrault type laser diode (FPLD1, FPLD2, FPLDn) respectively with N wavelength division multiplexer (WDM3 ..., WDMn+1, WDMn+2) the second port is connected, N optical receiver (RX1, RX2 ... RXn) respectively with N wavelength division multiplexer (WDM3,, WDMn+1, WDMn+2) and the 3rd port is connected.
The public port of (going) multiplexer ((D) MUX2) is connected with the first port of first wave division multiplexer (WDM1), the second port of first wave division multiplexer (WDM1) is connected with the second port of light gyroscope (OC), the first port of light gyroscope (OC) is connected with wideband light source (BLS), and the 3rd port of light gyroscope (OC) is connected with the second port of Second Wave division multiplexer (WDM2).
The 3rd port of the 3rd port of first wave division multiplexer (WDM1) and Second Wave division multiplexer (WDM2) interconnects, and the first port of Second Wave division multiplexer (WDM2) becomes the output port of transmission system (100).
Investigate the principle of work of transmission system (100), the output of wideband light source (BLS) is transfused to by the first port of light gyroscope (OC),, by the second port, then is imported into the second port of first wave division multiplexer (WDM1).
Then, the part in the light inputted by the first port of first wave division multiplexer (WDM1).
Output from first wave division multiplexer (WDM1) is imported in the public port of (going) multiplexer ((D) MUX2), and then the corresponding input/output end port by (going) multiplexer ((D) MUX2) is output respectively.
Output from (going) multiplexer ((D) MUX2) is input to respectively N wavelength division multiplexer (WDM3, WDMn+1, WDMn+2) in the first port, then be output by the second port, to be imported into respectively N Fabry-Perrault type laser diode (FPLD1, FPLD2,, FPLDn) in.
N Fabry-Perrault type laser diode (FPLD1, FPLD2 ..., FPLDn) the five group light signal (λ of difference output wavelength in the passband of N the input/output end port of (going) multiplexer ((D) MUX2)
1, λ
2..., λ
N).
The 5th group of light signal (λ
1, λ
2..., λ
N) by N wavelength division multiplexer (WDM3 ..., WDMn+1, WDMn+2) transmit to be imported in (going) multiplexer ((D) MUX2), and at this, be re-used.Then be imported in the first port of first wave division multiplexer (WDM1) through multiplexing signal.
Be input to the 5th group of light signal (λ in the first port of first wave division multiplexer (WDM1)
1, λ
2..., λ
N) by the second port, be output, the second port and the 3rd port through light gyroscope (OC), then be imported in the second port of Second Wave division multiplexer (WDM2), with the first port by Second Wave division multiplexer (WDM2), be output.
Be input to the 6th group of light signal (λ in the first port of Second Wave division multiplexer (WDM2)
N+1, λ
N+2..., λ
2N) by the 3rd port, be output, then be imported in the 3rd port of first wave division multiplexer (WDM1),, by the first port, to be output, then be imported in the public port of (going) multiplexer ((D) MUX2).
The 6th group of light signal (λ that inputs by public port
N+1, λ
N+2..., λ
2N) input/output end port of correspondence by (going) multiplexer ((D) MUX2) is output, be imported into N wavelength division multiplexer (WDM3 ..., WDMn+1, WDMn+2) the first port in.
Be input to N wavelength division multiplexer (WDM3 ..., WDMn+1, WDMn+2) in the 6th group of light signal (λ
N+1, λ
N+2..., λ
2N) then the 3rd port by wavelength division multiplexer be output, with by optical receiver (RX1, RX2 ..., RXn) receive.
Here, transmission system (100) can also comprise for N Fabry-Perrault type laser diode (FPLD1 of modulation, FPLD2, FPLDn) N laser diode driver circuit (DR1, DR2,, DRn), be used for N Fabry-Perrault type laser diode (FPLD1, FPLD2, the N that temperature FPLDn) is controlled laser diode temperature controller (TEC1, TEC2 ... and be used for the temperature controller (TEC) that the temperature of (going) multiplexer ((D) MUX2) is controlled TECn).
Figure 10 shows the 4th embodiment that uses according to the wave division multiplexing transmission system of light source of the present invention.
As shown in figure 10, wave division multiplexing transmission system according to the present invention comprises N Fabry-Perrault type laser diode (FPLD1, FPLD2, FPLDn), N laser diode temperature controller (TEC1, TEC2, TECn), N * 1 (going) multiplexer ((D) MUX2), (going) multiplexer temperature controller (TEC), a light gyroscope (OC), a wideband light source (BLS), an external modulator (EM), an and external modulator driving circuit (EMDR).
(going) multiplexer ((D) MUX2) carries out demultiplexing and exports them by N input/output end port respectively the wavelength-division-multiplexed optical signal of inputting by public port.Perhaps, it carries out multiplexing to the light signal with different wave length of inputting by N input/output end port respectively, and by public port, exports them.
Wideband light source (BLS) emission broadband light.
The light signal that light gyroscope (OC) is inputted by the first port by the second port output, and by the light signal of the 3rd port output by the second port input.
The connection of above-mentioned transmission system (100) can be performed as follows:
N Fabry-Perrault type laser diode (FPLD1, FPLD2, FPLDn) be connected with N the port of (going) multiplexer ((D) MUX2) respectively, and the public port of (going) multiplexer ((D) MUX2) is connected with the second port of light gyroscope (OC).
The first port of light gyroscope (OC) is connected with wideband light source (BLS), and the 3rd port of light gyroscope (OC) is connected with external modulator (EM).
External modulator driving circuit (EMDR) is connected with external modulator (EM), so electric signal is imported in external modulator driving circuit (EMDR), and modulated light signal is output by external modulator (EM).
Investigate the principle of work of transmission system (100), the output of wideband light source (BLS) is transfused to by the first port of light gyroscope (OC), by the second port, in the public port that is imported into (going) multiplexer ((D) MUX2), then corresponding N port by (going) multiplexer ((D) MUX2) is output respectively.
Output from (going) multiplexer ((D) MUX2) is input to respectively N Fabry-Perrault type laser diode (FPLD1, FPLD2, FPLDn) in, and each Fabry-Perrault type laser diode (FPLD1, FPLD2 ..., FPLDn) export respectively the light signal of its wavelength in the passband of N the port of (going) multiplexer ((D) MUX2).
From N Fabry-Perrault type laser diode (FPLD1, FPLD2 ..., output FPLDn) is undertaken multiplexing by (going) multiplexer ((D) MUX2),, by light gyroscope (OC), then be imported in external modulator (EM).Then, the electric signal that receives by use of external modulator (EM) is modulated the light signal of input and is exported modulated signal.
In above-described transmission system (100), be applied to Fabry-Perrault type laser diode (FPLD1 by control, FPLD2, FPLDn) electric current in, the light signal that can control (or more than the 2) specific wavelength that has is output by external modulator (EM).
Transmission system of the present invention (100) also comprises: N Polarization Controller (PC1, PC2, PCn), they are connected to input/output end port and the Fabry-Perrault type laser diode (FPLD1 of (going) multiplexer ((D) MUX2), FPLD2 ..., FPLDn) between; Perhaps a Polarization Controller, be connected between external modulator (EM) and light gyroscope (OC).
Transmission system (100) also comprises for to N Fabry-Perrault type laser diode (FPLD1, FPLD2, FPLDn) N that temperature is controlled laser diode temperature controller (TEC1, TEC2,, TECn) and be used for the temperature controller (TEC) that the temperature of (going) multiplexer ((D) MUX2) is controlled.
Figure 11 shows the 5th embodiment that uses according to the wave division multiplexing transmission system of light source of the present invention, and it also comprises the optical receiver (RX) of the structure with transmission system shown in Figure 10.
Optical receiver (RX) converts the light signal of input to electric signal.
Owing to comprising additional optical receiver (RX), so when from the outside input, having the light signal of specific wavelength, system can be converted to electric signal with this signal, then converts it back to the light signal with 1 (or more) wavelength.
Here, by control be applied to Fabry-Perrault type laser diode (FPLD1, FPLD2 ..., electric current FPLDn), can change the wavelength by the light signal of external modulator (EM) output.
As mentioned above, use the cost that has reduced each channel according to the wave division multiplex transmission system of light source of the present invention.And it can increase output power, thereby make, can easily build transmission system and expanding coverage area of network.
In addition, wave division multiplexing transmission system according to the present invention is built as for by the input of same optical fiber and/or output wavelength-division-multiplexed optical signal, thereby, the quantity of the required optical fiber of optical communication can be dropped to half of prior art.
Because those skilled in the art can recognize within the scope of the present invention additional variations and application, so the present invention is not limited to the above embodiments and accompanying drawing.
Claims (18)
1. wave division multiplexing transmission system comprises:
The wideband light source of output broadband light;
The light gyroscope, pass through the light signal of the first port input of this light gyroscope by the second port output of this light gyroscope, and export the light signal of inputting by described second port of this light gyroscope by the 3rd port of this light gyroscope;
2N * 1 multiplexer/demultiplexer, have an a public port and 2N input/output end port, transmits respectively the light signal with different wave length between described public port and a described 2N input/output end port;
The first cross device, at the light signal with first specific wavelength that transmits between the described public port of described multiplexer/demultiplexer and the odd number input/output end port in a described 2N input/output end port, and obstruction has the light signal of second specific wavelength different from described the first specific wavelength in transmission between the second port of the first port of this first cross device and this first cross device; And, at the light signal with described second specific wavelength that transmits between the described public port of described multiplexer/demultiplexer and the even number input/output end port in a described 2N input/output end port, and obstruction has the light signal of described the first specific wavelength in transmission between the 3rd port of the first port of this first cross device and this first cross device;
The second wave length interleaver, at the light signal with described first specific wavelength that transmits between the described public port of described multiplexer/demultiplexer and the described odd number input/output end port in a described 2N input/output end port, and obstruction has the light signal of described the second specific wavelength in transmission between the second port of the first port of this second wave length interleaver and this second wave length interleaver; And, at the light signal with described second specific wavelength that transmits between the described public port of described multiplexer/demultiplexer and the described even number input/output end port in a described 2N input/output end port, and obstruction has the light signal of described the first specific wavelength in transmission between the 3rd port of the first port of this second wave length interleaver and this second wave length interleaver;
N Fabry-Perrault type laser diode; And
N optical receiver, the light signal that is used for inputting is converted to electric signal and exports them,
It is characterized in that:
Described N Fabry-Perrault type laser diode is connected with the described odd number input/output end port in described 2N input/output end port of described multiplexer/demultiplexer respectively;
A described N optical receiver is connected with the described even number input/output end port in described 2N input/output end port of described multiplexer/demultiplexer respectively;
The described public port of described multiplexer/demultiplexer is connected with the first port of the first cross device;
The second port of described the first cross device is connected with the second port of described smooth gyroscope;
The first port of described smooth gyroscope is connected with described wideband light source;
The 3rd port of described smooth gyroscope is connected with the second port of second wave length interleaver; And
The 3rd port of described second wave length interleaver is connected with the 3rd port of described the first cross device;
The first port of described second wave length interleaver is used for the light signal of described the first specific wavelength being arranged and receiving the light signal with described second specific wavelength from outside to outside output device.
2. wave division multiplexing transmission system according to claim 1,
It is characterized in that, also comprise the temperature controller of controlling for the temperature to described multiplexer/demultiplexer.
3. wave division multiplexing transmission system according to claim 1,
It is characterized in that, also comprise for directly modulating N laser diode driver circuit of described N Fabry-Perrault type laser diode.
4. wave division multiplexing transmission system according to claim 1,
It is characterized in that, also comprise N the temperature controller of controlling for the temperature to described N Fabry-Perrault type laser diode.
5. wave division multiplexing transmission system comprises:
The wideband light source of output broadband light;
The light gyroscope, pass through the light signal of the first port input of this light gyroscope by the second port output of this light gyroscope, and export the light signal of inputting by described second port of this light gyroscope by the 3rd port of this light gyroscope;
2N * 1 multiplexer/demultiplexer, have an a public port and 2N input/output end port, transmits respectively the light signal with different wave length between described public port and a described 2N input/output end port;
The first wave division multiplexer, in transmission between the second port of the first port of this first wave division multiplexer and this first wave division multiplexer in the described public port of described multiplexer/demultiplexer and a described 2N input/output end port the 1st to the light signal with first specific wavelength that transmits between the N input/output end port, and obstruction has the light signal of second specific wavelength different from described the first specific wavelength; And, between the 3rd port of the first port of this first wave division multiplexer and this first wave division multiplexer transmission the described public port of described multiplexer/demultiplexer with the N+1 in a described 2N input/output end port to the light signal with described second specific wavelength that transmits between the 2N input/output end port, and obstruction has the light signal of described the first specific wavelength;
The Second Wave division multiplexer, in transmission between the second port of the first port of this Second Wave division multiplexer and this Second Wave division multiplexer in the described public port of described multiplexer/demultiplexer and a described 2N input/output end port the described the 1st to the light signal with described first specific wavelength that transmits between the N input/output end port, and obstruction has the light signal of described the second specific wavelength; And, between the 3rd port of the first port of this Second Wave division multiplexer and this Second Wave division multiplexer transmission the described public port of described multiplexer/demultiplexer with the described N+1 in a described 2N input/output end port to the light signal with described second specific wavelength that transmits between the 2N input/output end port, and obstruction has the light signal of described the first specific wavelength;
N Fabry-Perrault type laser diode; And
N optical receiver, the light signal that is used for inputting is converted to electric signal and exports them,
It is characterized in that:
Described N Fabry-Perrault type laser diode respectively with described 2N input/output end port of described multiplexer/demultiplexer in the 1st to the N input/output end port, be connected;
A described N optical receiver respectively with described 2N input/output end port of described multiplexer/demultiplexer in N+1 be connected to the 2N input/output end port;
The described public port of described multiplexer/demultiplexer is connected with the first port of first wave division multiplexer;
The second port of described first wave division multiplexer is connected with the second port of described smooth gyroscope;
The first port of described smooth gyroscope is connected with described wideband light source;
The 3rd port of described smooth gyroscope is connected with the second port of Second Wave division multiplexer;
The 3rd port of described Second Wave division multiplexer is connected with the 3rd port of described first wave division multiplexer; And
The first port of described Second Wave division multiplexer is used for the light signal of described the first specific wavelength being arranged and receiving the light signal with described second specific wavelength from outside to outside output device.
6. wave division multiplexing transmission system according to claim 5,
It is characterized in that, also comprise the temperature controller of controlling for the temperature to described multiplexer/demultiplexer.
7. wave division multiplexing transmission system according to claim 5,
It is characterized in that, also comprise for directly modulating N laser diode driver circuit of described N Fabry-Perrault type laser diode.
8. wave division multiplexing transmission system according to claim 5,
It is characterized in that, also comprise N the temperature controller of controlling for the temperature to described N Fabry-Perrault type laser diode.
9. wave division multiplexing transmission system comprises:
The wideband light source of output broadband light;
The light gyroscope, pass through the light signal of the first port input of this light gyroscope by the second port output of this light gyroscope, and export the light signal of inputting by described second port of this light gyroscope by the 3rd port of this light gyroscope;
N * 1 multiplexer/demultiplexer, have an a public port and N input/output end port, transmits respectively the light signal with different wave length between described public port and a described N input/output end port;
first to the N+2 wavelength division multiplexer, wherein, first respectively has following structure to the N+2 wavelength division multiplexer: in transmission between the second port of the first port of this wavelength division multiplexer and this wavelength division multiplexer, transmit between the described public port of described multiplexer/demultiplexer and a described N input/output end port, light signal with the specific wavelength in the specific Free Spectral Range of described multiplexer/demultiplexer, and obstruction has the light signal of the first wavelength, the interval of the described Free Spectral Range of wavelength departure of described the first wavelength and the described light signal that transmits between described second port of described first port of this wavelength division multiplexer and this wavelength division multiplexer, and transmission has the light signal of described the first wavelength between the 3rd port of the first port of this wavelength division multiplexer and this wavelength division multiplexer, and blocks the light signal with described specific wavelength,
N Fabry-Perrault type laser diode; And
N optical receiver, the light signal that is used for inputting is converted to electric signal and exports them,
It is characterized in that:
Described N input/output end port of described multiplexer/demultiplexer is connected with the 3rd the first port to the N+2 wavelength division multiplexer respectively;
Described N Fabry-Perrault type laser diode is connected with the described the 3rd the second port to the N+2 wavelength division multiplexer respectively;
A described N optical receiver is connected with the described the 3rd the 3rd port to the N+2 wavelength division multiplexer respectively;
The described public port of described multiplexer/demultiplexer is connected with the first port of described first wave division multiplexer;
The second port of described first wave division multiplexer is connected with the second port of described smooth gyroscope;
The first port of described smooth gyroscope is connected with described wideband light source;
The 3rd port of described smooth gyroscope is connected with the second port of described Second Wave division multiplexer;
The 3rd port of described Second Wave division multiplexer is connected with the 3rd port of described first wave division multiplexer; And
The first port of described Second Wave division multiplexer is used for the light signal of described specific wavelength being arranged and receiving the light signal with described first wavelength from outside to outside output device.
10. wave division multiplexing transmission system according to claim 9,
It is characterized in that, also comprise the temperature controller of controlling for the temperature to described multiplexer/demultiplexer.
11. wave division multiplexing transmission system according to claim 9,
It is characterized in that, also comprise for directly modulating N laser diode driver circuit of described N Fabry-Perrault type laser diode.
12. wave division multiplexing transmission system according to claim 9,
It is characterized in that, also comprise N the temperature controller of controlling for the temperature to described N Fabry-Perrault type laser diode.
13. a wave division multiplexing transmission system comprises:
The wideband light source of output broadband light;
The light gyroscope, pass through the light signal of the first port input of this light gyroscope by the second port output of this light gyroscope, and export the light signal of inputting by the second port of this light gyroscope by the 3rd port of this light gyroscope;
N * 1 multiplexer/demultiplexer, have an a public port and N input/output end port, transmits respectively the light signal with different wave length between described public port and a described N input/output end port;
N Fabry-Perrault type laser diode;
External modulator, it has for the input port of light signal and output port, according to the light signal of the electric signal modulation that applies to it by described input port input, and by the modulated signal of described output port output; And
The external modulator drive unit, it is connected to be provided for operating the described electric signal of described external modulator with described external modulator,
It is characterized in that:
Described N Fabry-Perrault type laser diode is connected with described N input/output end port of described multiplexer/demultiplexer respectively;
The described public port of described multiplexer/demultiplexer is connected with the second port of described smooth gyroscope;
The first port of described smooth gyroscope is connected with described wideband light source; And
The 3rd port of described smooth gyroscope is connected with the described input port of described external modulator.
14. wave division multiplexing transmission system according to claim 13,
It is characterized in that, also comprise optical receiver, this optical receiver is connected with the input port of described external modulator drive unit, thereby the light signal that will be input in described optical receiver is converted to electric signal, then described electric signal is converted to again light signal and exports described light signal through again changing.
15. wave division multiplexing transmission system according to claim 13,
It is characterized in that, also comprise the temperature controller of controlling for the temperature to described multiplexer/demultiplexer.
16. wave division multiplexing transmission system according to claim 13,
It is characterized in that, also comprise N Polarization Controller between described N the input/output end port that is connected to described N Fabry-Perrault type laser diode and described multiplexer/demultiplexer.
17. wave division multiplexing transmission system according to claim 13,
It is characterized in that, also comprise described the 3rd port that is connected to described smooth gyroscope and the Polarization Controller between described external modulator.
18. wave division multiplexing transmission system according to claim 13,
It is characterized in that, also comprise N the temperature controller of controlling for the temperature to described N Fabry-Perrault type laser diode.
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| CN1354840A (en) * | 1998-06-10 | 2002-06-19 | Lsa公司 | Laser communication system and method |
| CN1481105A (en) * | 2002-08-06 | 2004-03-10 | Wave division multiroute multiplying passive optical network system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1354840A (en) * | 1998-06-10 | 2002-06-19 | Lsa公司 | Laser communication system and method |
| CN1481105A (en) * | 2002-08-06 | 2004-03-10 | Wave division multiroute multiplying passive optical network system |
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