CN101145849A - Signal receiving system and method for differential phase shift key control optical transmission system - Google Patents
Signal receiving system and method for differential phase shift key control optical transmission system Download PDFInfo
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- CN101145849A CN101145849A CNA2007101276362A CN200710127636A CN101145849A CN 101145849 A CN101145849 A CN 101145849A CN A2007101276362 A CNA2007101276362 A CN A2007101276362A CN 200710127636 A CN200710127636 A CN 200710127636A CN 101145849 A CN101145849 A CN 101145849A
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Abstract
The invention discloses a signal receive system and a method in DPSK optical transmission system. The signal receive system comprises a band-pass optical filter to filter the received DPSK optical signal; a receive device to directly detect and converse the filtered optical signal into an electronic signal, which is then treated to get an original data sent by a signal transmission system. Compared with the common method of delay interference and balance receiving in the DPSK optical transmission system, the invention greatly improves the dispersion tolerance and maintains the DPSK's high tolerant ability to the optical non-linear effect.
Description
Technical field
The present invention relates to optical communication field, relate more specifically to a kind of receiving system and method for differential phase-shift-keyed optic transmission system.
Background technology
Dense wave division multipurpose (Dense Wavelength Division Multiplexing is called for short DWDM) optical transmission system transmits the signal of a plurality of wavelength in optical fiber, transmission capacity is very big.In the DWDM transmission system, if adopt differential phase keying (DPSK) (DifferentialPhase-shift Keying, abbreviation DPSK) modulation format transmits, then can obtain receiving sensitivity, Optical Signal To Noise Ratio (Optical Signal to Noise Ratio preferably, be called for short OSNR) tolerance limit, suppress fiber nonlinear effect effectively, thereby realize the over distance transmission.
Usually, as shown in Figure 1, the receiving terminal of DPSK transmission system need adopt Mach-Zehnder time delay interferometer (Mach-Zehnder Delay Interferometer is called for short MZDI) and balanced reciver.The arm of MZDI has the time-delay of 1 bit, and when the signal phase of two arms of MZDI was identical, one in the output port had light; When the signal phase phase difference of pi of two arms of MZDI, another output port has light.Two output ports of MZDI link to each other with an optical-electrical converter respectively, can recover the raising that primary signal also can obtain the 3dB receiver sensitivity thus.
Because this demodulation method needs the accuracy of strict control time-delay when using MZDI, thus the difficulty and the complexity of control increased, and use MZDI and balanced reciver to increase system cost.
Summary of the invention
One or more problems in view of the above the invention provides a kind of receiving system and method for reseptance of DPSK optical transmission system.
Receiving system according to DPSK optical transmission system of the present invention comprises: the logical optical filter of band is used for the DPSK light signal that receives is carried out Filtering Processing; Signal receiving device is used for the light signal through Filtering Processing is converted to the signal of telecommunication through directly detecting, and the signal of telecommunication is handled, to draw the initial data that signal sending system sends from the signal of telecommunication.
Wherein, signal receiving device comprises: photoelectric conversion unit is used for the light signal through Filtering Processing is converted to the signal of telecommunication through directly detecting; Signal amplification unit is used for amplification signal; And the data decision unit, be used for to carry out the amplitude judgement through the signal of telecommunication that amplifies, to draw the initial data that signal sending system sends from the signal of telecommunication through amplification.
Wherein, the bandwidth of the logical optical filter of band need be at 0.5/T in the scope of 2/T.Especially, the bandwidth of the logical optical filter of band can be 0.65/T.
Be applicable in the following system any one according to the receiving system of DPSK optical transmission system of the present invention: differential phase-shift-keyed optic transmission system, the differential phase-shift-keyed optic transmission system that makes zero, carrier suppressed make zero differential phase-shift-keyed optic transmission system, and other differential phase-shift-keyed optic transmission system.And optical filter can be the channel-splitting filter of above optical transmission system.Signal receiving device can be the signal receiver of on-off keying optical transmission system.
According to DPSK light signal method of reseptance of the present invention, may further comprise the steps: S702, carry out Filtering Processing to the DPSK light signal that receives; S704 will be converted to the signal of telecommunication through directly detecting through the light signal of Filtering Processing, and the signal of telecommunication will be handled, to draw the initial data that signal sending system sends from the signal of telecommunication.
Wherein, step S704 may further comprise the steps: S7042 will be converted to the signal of telecommunication through directly detecting through the light signal of Filtering Processing; S7044 amplifies the signal of telecommunication; And S7046, to carry out the amplitude judgement through the signal of telecommunication that amplifies, to draw the initial data that signal sending system sends from the signal of telecommunication through amplification.
Wherein, DPSK light signal method of reseptance according to the present invention is applicable to any one in the following system: differential phase-shift-keyed optic transmission system, the differential phase-shift-keyed optic transmission system that makes zero, carrier suppressed make zero differential phase-shift-keyed optic transmission system, and other differential phase-shift-keyed optic transmission system.
All very simple according to signal acceptance method of the present invention and device, and control is convenient, with low cost.Because the present invention do not use balanced reciver, so compare with the method for reseptance of conventional dpsk signal, receiver sensitivity, OSNR tolerance limit difference are a little, but dispersion tolerance improves a lot, and have kept the DPSK characteristic strong to the fiber nonlinear effect tolerance.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of the receiving terminal of the DPSK optical transmission system of routine in the correlation technique;
Fig. 2 is the structural representation according to receiving system of the present invention;
Fig. 3 is the structural representation according to the DPSK optical transmission system of the embodiment of the invention;
Fig. 4 A to Fig. 4 E is that some A among Fig. 3 is to the signal waveforms of putting E and eye pattern;
Fig. 5 is the structural representation according to the RZ-DPSK optical transmission system of the embodiment of the invention;
Fig. 6 A to Fig. 6 E is that some A among Fig. 5 is to the signal waveforms of putting E and eye pattern; And
Fig. 7 is the flow chart according to the signal acceptance method of the embodiment of the invention.
Embodiment
Below with reference to accompanying drawing, describe the specific embodiment of the present invention in detail.
With reference to figure 2, illustrate according to receiving system of the present invention.As shown in Figure 2, this is used for DPSK, the DPSK that makes zero (Return to Zero DPSK, be called for short RZ-DPSK), carrier suppressed DPSK (the Carrier-Suppressed Return to Zero DPSK that makes zero, abbreviation CSRZ-DPSK) receiving system of optical transmission system comprises: the optical receiver (that is signal receiving device) of logical optical filter of band and direct detection.Wherein, the bandwidth requirement of the logical optical filter of band is not strict.Generally speaking, the logical optical filter of band-three dB bandwidth need be (T be a bit period) more than the 0.5/T, below the 2/T.Bandwidth transmits incomplete same to different DPSK.Under suitable bandwidth was selected, the logical optical filter of band can directly adopt the channel-splitting filter of optical transmission system.Directly the optical receiver that detects can be the direct-detection receiver of common on-off keying modulation format transmission system, is used for the signal through the Filtering Processing of the logical optical filter of band is carried out the direct detection of luminous intensity.Directly the optical-electrical converter in the optical receiver of Jian Ceing, amplification and clock data decision unit (that is, signal amplification unit and data decision unit) are the same with corresponding units among Fig. 1.
With reference to figure 3, the structure according to the DPSK optical transmission system of the embodiment of the invention is described.As shown in Figure 3, adopted the structure of the logical optical filter of band+Direct-detection Optical receiver at the receiving terminal of 10Gb/s DPSK optical transmission system.Wherein, for convenience of explanation, comprised the block diagram of DPSK transmitting terminal among Fig. 3.In Fig. 3, the bandwidth of the logical optical filter of band is about 0.65/T; Optical transmission chain comprises unit such as image intensifer in wavelength division multiplexing (Wavelength Division Multiplexing, the be called for short WDM) optical transmission system, optical fiber.
The signal that Fig. 4 A to Fig. 4 E shows the DPSK optical transmission system develops schematic diagram.Some A among Fig. 3 corresponds respectively to Fig. 4 A to Fig. 4 E to the signal of putting E.To find out, dpsk signal B has noise, signal skew through behind the optical transmission chain from Fig. 4 A to Fig. 4 E; Through behind the logical optical filter of band, the signal D that obtains is similar to optical duo binary signals, can directly detect again.Can carry out the amplitude judgement through the signal E that obtains behind the Direct-detection Optical receiver, thereby obtain initial data.
With reference to figure 5, the RZ-DPSK optical transmission system according to the embodiment of the invention is described.As shown in Figure 5, the receiving terminal of 10Gb/s RZ-DPSK optical transmission system has adopted the structure of the logical optical filter of band+Direct-detection Optical receiver.Wherein, for convenience of explanation, comprised the block diagram of RZ-DPSK transmitting terminal among Fig. 5.In Fig. 5, the logical optical filter bandwidth of band is about 0.65/T; Optical transmission chain comprises unit such as image intensifer in the WDM optical transmission system, optical fiber.
The signal that Fig. 6 A to Fig. 6 E shows the RZ-DPSK optical transmission system develops schematic diagram.Some A among Fig. 8 to the signal of putting E corresponding to Fig. 6 A to Fig. 6 E.From Fig. 6 A to Fig. 6 E as can be seen, RZ-DPSK signal B has noise, signal skew through behind the optical transmission chain; Through behind the logical optical filter of band, the signal D that obtains is similar to the ODB signal, thereby can directly detect again.Can carry out the amplitude judgement through the signal E that obtains behind the Direct-detection Optical receiver, thereby obtain initial data.
The present invention also provides the signal acceptance method of a kind of DPSK of being used for, RZ-DPSK, CSRZ-DPSK optical transmission system.With reference to figure 7, the signal acceptance method according to the embodiment of the invention is described.As shown in Figure 7, this DPSK light signal method of reseptance may further comprise the steps: S702, carry out Filtering Processing to the DPSK light signal that receives; S704 will be converted to the signal of telecommunication through directly detecting through the light signal of Filtering Processing, and the signal of telecommunication will be handled, to draw the initial data that signal sending system sends from the signal of telecommunication.
Wherein, step S704 may further comprise the steps: S7042 will be converted to the signal of telecommunication through the light signal of Filtering Processing; S7044 amplifies the signal of telecommunication; And S7046, to carry out the amplitude judgement through the signal of telecommunication that amplifies, to draw the initial data that signal sending system sends from the signal of telecommunication through amplification.
Wherein, phase information is converted to strength information, makes it to become the light signal that is similar to optical duo-binary (Optical Duobinary, abbreviation ODB), carry out opto-electronic conversion and regularly judgement with the Direct-detection Optical receiver again by optical band pass filter.
In sum, adopt this direct Detection Method to carry out the reception of dpsk signal, method and apparatus is all very simple, and control is convenient, cost is low.Wherein, optical receiver can adopt the receiver of regular tap key control optical transmission system, and the logical optical filter of the band of certain bandwidth can directly adopt the channel-splitting filter of dwdm system.Owing to do not use balanced reciver, so compare with the balance method of reseptance of conventional DPSK, receiver sensitivity, OSNR tolerance limit difference are a little, but dispersion tolerance improves a lot, and have kept the DPSK characteristic strong to the fiber nonlinear effect tolerance.
The above is embodiments of the invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (9)
1. the receiving system of a differential phase-shift-keyed optic transmission system is characterized in that,
Comprise:
The logical optical filter of band is used for the differential phase keying (DPSK) light signal that receives is carried out Filtering Processing;
Signal receiving device is used for the light signal through Filtering Processing is converted to the signal of telecommunication through directly detecting, and the described signal of telecommunication is handled, to draw the initial data that signal sending system sends from the described signal of telecommunication.
2. receiving system according to claim 1 is characterized in that, described band leads to the bandwidth of optical filter in 0.5/T arrives the scope of 2/T, different transmission signals filter bandwidht differences.
3. receiving system according to claim 1 is characterized in that, described signal receiving device comprises:
Photoelectric conversion unit is used for described light signal through Filtering Processing is converted to the described signal of telecommunication through directly detecting;
Signal amplification unit is used to amplify the described signal of telecommunication; And
The data decision unit is used for to carry out the amplitude judgement through the signal of telecommunication that amplifies, to draw the described initial data that described signal sending system sends from described through the signal of telecommunication that amplifies.
4. according to each described receiving system in the claim 1 to 3, it is characterized in that described system is applicable to any one in the following system: the differential phase-shift-keyed optic transmission system that makes zero, carrier suppressed make zero differential phase-shift-keyed optic transmission system, and other differential phase keying (DPSK) transmission system.
5. receiving system according to claim 1 is characterized in that, the logical optical filter of described band adopts the channel-splitting filter of described differential phase-shift-keyed optic transmission system.
6. receiving system according to claim 1 is characterized in that, described signal receiving device is the signal receiver of on-off keying optical transmission system.
7. a differential phase keying (DPSK) light signal method of reseptance is characterized in that, may further comprise the steps:
S702 carries out Filtering Processing to the differential phase keying (DPSK) light signal that receives;
S704 will be converted to the signal of telecommunication through directly detecting through the light signal of Filtering Processing, and the described signal of telecommunication will be handled, to draw the initial data that signal sending system sends from the described signal of telecommunication.
8. signal acceptance method according to claim 7 is characterized in that, described step
S704 may further comprise the steps:
S7042 is converted to the described signal of telecommunication with described light signal through Filtering Processing through directly detecting;
S7044 amplifies the described signal of telecommunication; And
S7046 is to carry out the amplitude judgement through the signal of telecommunication that amplifies, to draw the described initial data that described signal sending system sends from described through the signal of telecommunication that amplifies.
9. according to claim 7 or 8 described signal acceptance methods, it is characterized in that described method is applicable to any one in the following system: differential phase-shift-keyed optic transmission system, the differential phase-shift-keyed optic transmission system that makes zero, carrier suppressed make zero differential phase-shift-keyed optic transmission system, and other differential phase-shift-keyed optic transmission system.
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| CNA2007101276362A CN101145849A (en) | 2007-06-20 | 2007-06-20 | Signal receiving system and method for differential phase shift key control optical transmission system |
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| CNA2007101276362A CN101145849A (en) | 2007-06-20 | 2007-06-20 | Signal receiving system and method for differential phase shift key control optical transmission system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103999383A (en) * | 2011-12-15 | 2014-08-20 | 瑞典爱立信有限公司 | Optical homodyne coherent receiver and method for receiving a multichannel optical signal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103999383A (en) * | 2011-12-15 | 2014-08-20 | 瑞典爱立信有限公司 | Optical homodyne coherent receiver and method for receiving a multichannel optical signal |
| US9356705B2 (en) | 2011-12-15 | 2016-05-31 | Telefonaktiebolaget Lm Ericsson (Publ) | Optical homodyne coherent receiver and method for receiving a multichannel optical signal |
| CN103999383B (en) * | 2011-12-15 | 2016-10-19 | 瑞典爱立信有限公司 | For receiving light homodyne coherent receiver and the method for multi-channel optical signal |
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Open date: 20080319 |