CN201341138Y - Differential phase shift keying demodulator based on etalon structure - Google Patents
Differential phase shift keying demodulator based on etalon structure Download PDFInfo
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- CN201341138Y CN201341138Y CNU2008201451145U CN200820145114U CN201341138Y CN 201341138 Y CN201341138 Y CN 201341138Y CN U2008201451145 U CNU2008201451145 U CN U2008201451145U CN 200820145114 U CN200820145114 U CN 200820145114U CN 201341138 Y CN201341138 Y CN 201341138Y
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Abstract
A differential phase shift keying demodulator based on an etalon structure is provided with a Michelson interferometer which comprises a parallel glass plate, a glass bottom plate and a glass spacer supported between the parallel glass plate and the glass bottom plate; wherein, an anti-reflection film is plated at a position on the upper surface of the parallel glass plate, which corresponds to input light signals, a highly reflecting film is plated at a position corresponding to reflected light signals, and an anti-reflection film is plated at a position corresponding to output light signals; a 50/50 polarization-independent spectroscopic film is plated at a position on the lower surface of the parallel glass plate, through which light signals pass; and a highly reflecting film is plated on the upper surface of the glass bottom plate. Between the parallel glass plate and the glass bottom plate, a glass plate for temperature compensation is arranged at a position through which transmitted light passes. An input collimator for input light signals, a first output collimator and a second output collimator are respectively arranged over the parallel glass plate, and the first and the second output collimators are coupled with the directions of two routes of output light signals. The structure based on the etalon structure has the advantages of simple fabrication technique, low cost, easy integration and encapsulation and the like, and is adaptable to mass production.
Description
Technical field
The utility model relates to a kind of demodulator, particularly relates to a kind of the stable of optical path difference of need not external control promptly can keeping, and is used for the differential phase shift keying demodulator based on the etalon structure of the jumbo communication system of long distance High-speed.
Background technology
In recent years, along with the development of two-forty, high-capacity optical fiber communication system, the differential phase keying (DPSK) modulation format gets more and more people's extensive concerning with the superior function in its spectral efficient extra long distance transmission.(On-off keying OOK) compares, and the remarkable advantage of DPSK is that (Bit Error Rate BER) under the condition, has reduced 3dB to the requirement of Optical Signal To Noise Ratio in same bit error rate with traditional intensity modulated form.Simultaneously, DPSK can effectively reduce in the wdm system cross-phase modulation (Cross Phase Modulation between adjacent channel, XPM) influence, (Polarization Mode Dispersion PMD) has higher tolerance and mitigation to nonlinear effect, chromatic dispersion, polarization mode dispersion.
Along with the concern to the DPSK modulation format is more and more, the research of the method for its modulation and demodulation also has remarkable progress.Typical DPSK receiver as shown in Figure 1, wherein, D represents the DPSK demodulator, F represents balance detection.The light signal that receives at first passes through the Mach-Zehnder time delay interferometer, and (Mach-Zehnder Delay Interferometer, MZDI), the differential delay of interferometer is a bit period.Like this, separate timing at DPSK, the phase information of previous bit can be relevant with the phase information of next bit just, thereby realize that phase modulated is to amplitude-modulated conversion, i.e. demodulation.The light signal that comes out from two outputs of MZDI subtracts each other (balance detection) again by photodetector respectively, can increase signal to noise ratio.Generally speaking, present stage has following several based on the DPSK demodulator of time delay interferometer:
(1) the Mach-Zehnder time delay interferometer of full fiber type or planar type optical waveguide, take structure as shown in Figure 1, but the device of full optical fiber or optical-waveguide-type often needs the accurate control (heating or voltage control) by the outside to keep the stable of optical path difference between interferometer two arms, thereby makes the complexity of device and cost rise;
(2) based on the Michelson time delay interferometer of Free Space Optics design, in this interferometer structure, key element is 50: 50 depolarization light splitting pieces.Humans such as patent document US 2007/0070505 A1 Y.C.Hsieh are realized the Michelson's interferometer structure based on the depolarization light splitting piece of 45 ° of incidents, in order to make relevant frequency drift (the Polarization Dependent Frequency Shift of polarization, PDFS) minimize, thereby this light splitting piece takes symmetrical plated film to make its phase place insensitive with the polarization of incident light attitude.But this kind is very high to technological requirement with 50: 50 depolarization spectro-films of 45 ° of incidents, and during with wide-angle incident like this, Polarization Dependent Loss (PDL) can increase, thereby has influence on the performance of device.In order to reduce the influence of PDL to device, can take 50: 50 depolarization spectro-films of low-angle incident, its principle is identical with the Michelson time delay interferometer of 45 ° of incidents, owing to take low-angle incident (in 13 °), the PDL of this device can be controlled in the desirable scope (below 0.1dB).But it is very obvious that two arm brachiums of the Michelson's interferometer of this kind structure change with ambient temperature, caused the drift of transmission spectral line centre wavelength, makes the device cisco unity malfunction;
(3) take the mode of polarized light interference, promptly on the polarization territory, realize the structure of Mach-Zehnder time delay interferometer.As document L.Christen et al., " Variable rate, multi-format receiver design for 10to 40Gb/s DPSK and OOK formats, 17 March 2008/Vol.16, No.6/Optics Express.
As a kind of expanded application of DPSK, difference quadrature phase shift keying (DQPSK) has been subjected to showing great attention to of researchers.A typical DQPSK receiver has comprised two DPSK receivers, as shown in Figure 2, promptly a pair of time delay interferometer DI and two couples of balance detection device F, the differential delay of each DI is the twice of a bit period, i.e. 2T (marking in Fig. 2).But between two arms of each DI certain phase difference is arranged, π/4 and-π/4.Therefore, the DQPSK demodulator can be built by two above-mentioned DPSK demodulators, and its key is the accurate control to phase difference.The way of realization of the DQPSK demodulator of being made up of two DPSK demodulators has a lot, full optical fiber and fiber waveguide form are more typically arranged, but the DQPSK demodulator of this type is the same with the DPSK demodulator, and the higher shortcoming of complexity and cost is arranged equally.
Patent application document US 2006/0140695A1 has proposed a kind of Michelson interferometer type DQPSK demodulator of PM signal PM of Free Space Optics design, but is based on the spectro-film of 45 ° of incidents equally, and complex structure, implements comparatively difficulty.
Patent application document US 2006/0171718 A1 has proposed a kind of DQPSK demodulator of PM signal PM based on polarized light interference, incident DQPSK light signal through one section PANDA type polarization maintaining optical fibre after, just produced a fixing time delay T between the polarization state of two quadratures, be divided into the light wave that two beam energies equate through the signal after the time-delay by a half-reflecting mirror, between this light wave fields pairwise orthogonal polarization state a fixed delay T is arranged, this two ways of optical signals produces based on the polarization interference of light respectively and produces four tunnel outputs, wherein ± and the phase shift of π/4 produces by one 1/4th slide.But the DQPSK of this kind structure need use Polarization Controller and control the polarization of incident light attitude, thereby has improved device cost greatly.
Summary of the invention
Technical problem to be solved in the utility model is, provide a kind of device volume little, manufacture craft is simple, need not external control promptly can keep the stable of optical path difference, is used for the differential phase shift keying demodulator based on the etalon structure of the jumbo communication system of long distance High-speed.
The technical scheme that the utility model adopted is: a kind of differential phase shift keying demodulator based on the etalon structure, include by parallel plate, glass film plates and be supported on parallel plate and glass film plates between the Michelson's interferometer that constitutes of glass pad, on the upper surface of parallel plate, be coated with anti-reflection film with the input optical signal corresponding position, be coated with highly reflecting films with the reflected light signal corresponding position, be coated with anti-reflection film with output light signal corresponding position; On the position of the lower surface light signal process of described parallel plate, be coated with 50/50 polarization-independent beam splitter; The position of optical signal transmissive process is coated with highly reflecting films on the upper surface of glass film plates.
Between described parallel plate and the glass film plates, the position of transmitted light process is provided with the sheet glass that is used for temperature-compensating.
The top of described parallel plate is respectively arranged with the input collimater of input optical signal, and exports first output collimator and second output collimator of the coupling of light signal direction with two-way.
The position that is positioned at the secondary optical signal transmissive process of highly reflecting films one side on the upper surface of described glass film plates is coated with anti-reflection film, and the position of glass film plates lower surface secondary transmitted light process also is coated with anti-reflection film.
The top of described parallel plate is respectively arranged with the input collimater of input optical signal, and with first output collimator of one tunnel output light signal direction coupling, the below of described glass film plates is provided with second output collimator with another road output light signal direction coupling.
Between described parallel plate and the glass film plates, transmitted light process the position by earlier to after set gradually shift component and be used for the sheet glass of temperature-compensating, be respectively arranged with the phase adjusted sheet that is used for phase-adjusted ± π/4 on the light path of sheet glass lower end and on the reflected light path on sheet glass right side, the two sides of the phase adjusted sheet of described two ± π/4 all is coated with anti-reflection film.
The top of described parallel plate is respectively arranged with the input collimater of input optical signal, export first output collimator and the 3rd output collimator of the coupling of light signal direction with two-way, and export second output collimator and the 4th output collimator of the coupling of light signal direction with other two-way.
The position that is positioned at three optical signal transmissive processes of highly reflecting films one side on the upper surface of described glass film plates is coated with anti-reflection film.The position of three transmitted light processes of glass film plates lower surface is coated with anti-reflection film.
The top of described parallel plate is respectively arranged with the input collimater of input optical signal, and with first output collimator and the 3rd output collimator of two-way output light signal direction coupling, the below of described glass film plates is provided with second output collimator and the 4th output collimator with two-way output light signal direction coupling in addition.
The width of described each coatings is by position and the spot size decision of hot spot on parallel plate and glass film plates.
Differential phase shift keying demodulator based on the etalon structure of the present utility model adopts the structure of similar Michelson (Michelson) interferometer to replace traditional Mach-Zehnder (Mach-Zehnder) interferometer structure, has reduced the volume of device; Adopt the part spectro-film of low-angle incident, manufacture craft is simple relatively, and Polarization Dependent Loss can maintain a lower level; With respect to full optical fiber or optical-waveguide-type Mach-Zehnder interferometer type demodulator, the utility model need not external control promptly can be kept the stable of optical path difference, can also regulate the position of centre wavelength by the angle of rotating little glass compensating plate, realize the adjustability of device; Adopt the structure of the utility model based on etalon, it is simple to have manufacture craft, and low-cost and easy of integration and encapsulation is fit to advantages such as large-scale production.
Description of drawings
Fig. 1 is the structural representation of typical dpsk signal receiver;
Fig. 2 is the structural representation of typical DQPSK signal receiver;
Fig. 3 is first embodiment that is used for the demodulator of dpsk signal reception of the present utility model;
Fig. 4 is second embodiment that is used for the demodulator of dpsk signal reception of the present utility model;
Fig. 5 is first embodiment of the demodulator of the DQPSK of being used for signal reception of the present utility model;
Fig. 6 is second embodiment of the demodulator of the DQPSK of being used for signal reception of the present utility model.
Wherein:
1: 2: the first output collimators of input collimater
2 ': 3: the second output collimators of the 3rd output collimator
3 ': the 4th output collimator 4: parallel plate
5: glass pad 6: glass film plates
7: highly reflecting films 8:50/50 polarization-independent beam splitter
9: the phase adjusted sheet 10 of ± π/4: shift component
11: anti-reflection film 12: sheet glass
Embodiment
Provide specific embodiment below in conjunction with accompanying drawing, further specify the differential phase shift keying demodulator based on the etalon structure of the present utility model and how to realize.
As shown in Figure 3, differential phase shift keying demodulator based on the etalon structure of the present utility model, include by parallel plate 4, glass film plates 6 and be supported on parallel plate 4 and glass film plates 6 between the Michelson's interferometer that constitutes of glass pad 5, on the upper surface of parallel plate 4, be coated with anti-reflection film 11 with the input optical signal corresponding position, be coated with highly reflecting films 7 with the reflected light signal corresponding position, be coated with anti-reflection film 11 with output light signal corresponding position; On the position of the lower surface light signal process of described parallel plate 4, be coated with 50/50 polarization-independent beam splitter 8; The position of optical signal transmissive process is coated with highly reflecting films 7 on the upper surface of glass film plates 6.
Between described parallel plate 4 and the glass film plates 6, transmitted light the position of process be provided with the sheet glass 12 that is used for temperature-compensating.
The top of described parallel plate 4 is respectively arranged with the input collimater 1 of input optical signal, and exports first output collimator 2 and second output collimator 3 of the coupling of light signal direction with two-way.
The operation principle of differential phase shift keying demodulator based on the etalon structure shown in Figure 3 is: the lower surface that at first incides parallel plate 4 from the DPSK light signal of parallel plate 4 upper surface incidents after parallel plate 4 refractions, deflecting light beams is divided into reverberation and transmitted light two bundles at the parallel plate lower surface that is coated with 50/50 spectro-film 8, and the energy of every Shu Guang is half of incident light energy; The highly reflecting films 7 of parallel plate 4 upper surfaces are positioned at the right side of anti-reflection film 11, wherein reverberation incide parallel plate 4 upper surface by the lower surface of highly reflecting films 7 reflected back parallel plates 4, the width of highly reflecting films 7 retes is determined by the position and the spot size of hot spot on parallel plate; Get back to the lower surface of parallel plate 4 after the highly reflecting films 7 that transmitted light is plated by glass film plates 6 upper surfaces reflect once more, at the parallel plate lower surface, transmitted light and catoptrical hot spot overlap also and interfere, and produce the output of two-way complementation.Two arm brachiums of interferometer are respectively reverberation at glass plate 4 and the aerial light path of transmitted light, when the differential delay that is produced by optical path difference is the duration of a bit, have just realized the demodulation of dpsk signal.Two place's highly reflecting films 7 of mentioning among the embodiment play the effect of two speculums in the Michelson's interferometer.In order to make the homonymy of two output collimators in the input collimater, the output light path that the DPSK restituted signal is positioned at glass film plates 6 directions is received after parallel plate 4 transmissions and with collimater 3 by the highly reflecting films that plated on the glass film plates 6 secondary reflection again.
As shown in Figure 4, the position that is positioned at the secondary optical signal transmissive process of highly reflecting films 7 one sides on the upper surface of described glass film plates 6 is coated with anti-reflection film 11, and the position of glass film plates 6 lower surface secondary transmitted light processes also is coated with anti-reflection film 11.The top of described parallel plate 4 is respectively arranged with the input collimater 1 of input optical signal, and with first output collimator 2 of one tunnel output light signal direction coupling, the below of described glass film plates 6 is provided with second output collimator 3 with another road output light signal direction coupling.
Compare with Fig. 3, in Fig. 4, on glass film plates 6, plate highly reflecting films and anti-reflection film from left to right successively, glass film plates 6 lower surface respective regions also plate anti-reflection film, the DPSK restituted signal is positioned at the anti-reflection film of output light path by being plated on the glass film plates 6 of glass film plates 6 directions, and a road in the output of interferometer two-way is from glass film plates 6 transmissions so.Output collimator 3 is placed with the transmitted light path coupling.Then incident collimater and output collimator 2 wherein are positioned at the homonymy based on the differential phase shift keying demodulator of etalon structure, and second output collimator 3 is positioned at the other side based on the differential phase shift keying demodulator of etalon structure.
Differential phase shift keying demodulator as shown in Figure 5 based on the etalon structure, include by parallel plate 4, glass film plates 6 and be supported on parallel plate 4 and glass film plates 6 between the Michelson's interferometer that constitutes of glass pad 5, on the upper surface of parallel plate 4, be coated with anti-reflection film 11 with the input optical signal corresponding position, be coated with highly reflecting films 7 with the reflected light signal corresponding position, be coated with anti-reflection film 11 with output light signal corresponding position; On the position of the lower surface light signal process of described parallel plate 4, be coated with 50/50 polarization-independent beam splitter 8; The position of optical signal transmissive process is coated with highly reflecting films 7 on the upper surface of glass film plates 6.Between described parallel plate 4 and the glass film plates 6, transmitted light process the position by earlier to after set gradually shift component 10 and be used for the sheet glass 12 of temperature-compensating, be respectively arranged with the phase adjusted sheet 9 that is used for phase-adjusted ± π/4 on the light path of sheet glass 12 lower ends and on the reflected light path on sheet glass 12 right sides, the two sides of the phase adjusted sheet 9 of described two ± π/4 all is coated with anti-reflection film.
The top of described parallel plate 4 is respectively arranged with the input collimater 1 of input optical signal, with first output collimator 2 of two-way output light signal direction coupling and the 3rd output collimator 2 ', and with second output collimator 3 of other two-way output light signal direction coupling and the 4th output collimator 3 '.
In Fig. 5, plate highly reflecting films on the glass film plates 6, the output of the wherein two-way of interferometer is through the reflection of the highly reflecting films of glass film plates 6, again through the parallel plate transmission so, so incident collimater and output collimator are positioned at the homonymy based on the differential phase shift keying demodulator of etalon structure.Differential phase shift keying demodulator based on the etalon structure shown in Figure 5 can be used as the difference quadrature phase shift keying demodulator, and its demodulating process is referring to the demodulating process of the described Fig. 6 in back.
Difference quadrature phase shift keying demodulator as shown in Figure 6 based on the etalon structure, identical with structure shown in Figure 5, include by parallel plate 4, glass film plates 6 and be supported on parallel plate 4 and glass film plates 6 between the Michelson's interferometer that constitutes of glass pad 5, on the upper surface of parallel plate 4, be coated with anti-reflection film 11 with the input optical signal corresponding position, be coated with highly reflecting films 7 with the reflected light signal corresponding position, be coated with anti-reflection film 11 with output light signal corresponding position; On the position of the lower surface light signal process of described parallel plate 4, be coated with 50/50 polarization-independent beam splitter 8; The position of optical signal transmissive process is coated with highly reflecting films 7 on the upper surface of glass film plates 6, and the position of glass film plates 6 lower surface secondary transmitted light processes also is coated with anti-reflection film 11.Between described parallel plate 4 and the glass film plates 6, transmitted light process the position by earlier to after set gradually shift component 10 and be used for the sheet glass 12 of temperature-compensating, be respectively arranged with the phase adjusted sheet 9 that is used for phase-adjusted ± π/4 on the light path of sheet glass 12 lower ends and on the reflected light path on sheet glass 12 right sides, the two sides of the phase adjusted sheet 9 of described two ± π/4 all is coated with anti-reflection film.Just, in the differential phase shift keying demodulator based on the etalon structure shown in Figure 6, the position that is positioned at three optical signal transmissive processes of highly reflecting films 7 one sides on the upper surface of described glass film plates 6 and the lower surface all is coated with anti-reflection film 11.The top of described parallel plate 4 is respectively arranged with the input collimater 1 of input optical signal, and with first output collimator 2 of two-way output light signal direction coupling and the 3rd output collimator 2 ', the below of described glass film plates 6 be provided with second output collimator 3 of two-way output light signal direction coupling in addition and the 4th output collimator 3 '.
Differential phase shift keying demodulator based on the etalon structure shown in Figure 6, can be used as the difference quadrature phase shift keying demodulator too, its demodulating process: the DQPSK light signal of incident is after arriving the lower surface of parallel plate 4 after the upper surface refraction of parallel plate 4, at first be divided into transmitted light a and reverberation b two bundles by 50/50 spectro-film 8, the energy of every Shu Guang is half of incident light energy.With reverberation b is example, this light beam is got back to the lower surface of parallel plate 4 after the reflection of parallel plate 4 upper surfaces, thereby be divided into light beam c and the d that transmission equates with reflection two energy by 50/50 spectro-film once more, light beam c and d are respectively after the highly reflecting films reflection of parallel plate 4 upper surfaces and glass film plates 6 upper surfaces, get back to the same position of parallel plate lower surface once more, mutual superposition also interferes, and produces the output of two-way complementation; The situation and the reverberation of transmitted light are similar, and just transmitted light a will be through a shift component 10, and its effect is to make transmitted light a through the reflection of glass film plates upper surface and at the bottom of getting back to parallel glass during 4 lower surface, and hot spot does not overlap with the hot spot of reverberation b.Like this, transmitted light a and reverberation b can be counted as two dpsk signals, and the time-delay that takes place is respectively as shown in Figure 2 interfered.Shift component 10 plays the effect that makes the light beam displacement, and it can be the transparency glass plate that a slice two sides is coated with anti-reflection film, makes that hot spot did not overlap when light beam a and b got back to the lower surface of parallel plate for the first time; Sheet glass 12 plays regulates optical path difference and temperature compensation function.In this figure, plate highly reflecting films and anti-reflection film on the glass film plates 6 successively, incident collimater so and two output collimators wherein are positioned at the homonymy based on the differential phase shift keying demodulator of etalon structure, and other two output collimators are positioned at the other side based on the differential phase shift keying demodulator of etalon structure.
In order to realize in the DQPSK demodulator ± phase shift of π/4 that introduced two phase adjusted sheets 9 that are used for phase-adjusted ± π/4 among the present invention, the two sides of the phase adjusted sheet 9 of ± π/4 all is coated with anti-reflection film.Change interference pattern by the angle of rotating these two sheet glass, thus the phase adjusted of realization ± π/4.
The width of each coatings described in the utility model is by position and the spot size decision of hot spot on parallel plate 4 and glass film plates 6.
Operation principle as the dpsk signal demodulator in the utility model can be summarized as follows:
If the complex amplitude of incident light is E, ignore the common phase part, interfere the two-way recovery amplitude expression formula of back output as follows:
Wherein, T
dBe the delay inequality that optical path difference produced that interferes two-beam, concerning the dpsk signal demodulation, T
dBe the duration of a bit, promptly to the dpsk signal of 40Gb/s, T
dBe 25ps,
The expression interferometer, is introduced by little sheet glass 12 to change the interference pattern of interferometer the fine setting (wavelength magnitude) of phase place.Optical path difference in order to make optical path difference insensitive with variation of temperature, is taked following two measures by the thickness decision of parallel plate, little glass compensating plate and air-gap in the utility model:
The first, the glass pad 5 that connects 6 of parallel plate 4 and glass film plates adopts the minimum material of temperature expansion coefficient, for example the zerodur glass of Schott AG;
The second, little sheet glass 12 can play the effect of temperature-compensating.Select the principle of little sheet glass material and thickness specific as follows:
The thickness of supposing parallel plate is d
1, refractive index is n
1, θ is the refraction angle in parallel plate, then the light path in interfering front glass panel can be expressed as:
OPL＝2n
1d
1/cosθ
Can get the temperature variant expression formula of light path thus is:
In order to compensate light path with variation of temperature, can add little sheet glass 12, the refractive index of establishing little sheet glass is n
2, thickness is d
2, then the additional optical distance of its generation is:
OPL′＝(n
2-n
air)d
2
The temperature variant expression formula of additional optical distance is:
Consider light path in the air-gap simultaneously with the variation of temperature situation, establishing air-gap thickness is d
3Light path is with variation of temperature in the air:
So optical path difference (Optical path-length difference, OPD) can describe by following formula as the function of temperature variation:
OPD(δT)＝OPL(δT)-OPL(δT)-OPL
air(δT)
The parallel glass panel material can adopt the less fused quartz of temperature expansion coefficient (fused silica) glass, by choosing n
2With d
2, make in the uniform temperature excursion, the change in optical path length that little sheet glass 12 and airborne change in optical path length can the full remuneration parallel plates, promptly optical path difference is insensitive with variation of temperature.Therefore, the two kinds of material refractive indexes and the coefficient of expansion chosen will differ bigger, and according to aforementioned calculation, little sheet glass material can adopt silicon (silicon) can play compensating action preferably.The another one effect of little glass compensating plate is: can finish fine adjustment function to phase place by the angle of rotary glass compensating plate, thereby change the position of device centre wavelength, realize the adjustability of device.
Claims (10)
1. differential phase shift keying demodulator based on the etalon structure, include by parallel plate (4), glass film plates (6) and be supported on parallel plate (4) and glass film plates (6) between the Michelson's interferometer that constitutes of glass pad (5), it is characterized in that, on the upper surface of parallel plate (4), be coated with anti-reflection film (11) with the input optical signal corresponding position, be coated with highly reflecting films (7) with the reflected light signal corresponding position, be coated with anti-reflection film (11) with output light signal corresponding position; On the position of the lower surface light signal process of described parallel plate (4), be coated with 50/50 polarization-independent beam splitter (8); The position of optical signal transmissive process is coated with highly reflecting films (7) on the upper surface of glass film plates (6).
2. the differential phase shift keying demodulator based on the etalon structure according to claim 1 is characterized in that, between described parallel plate (4) and the glass film plates (6), the position of transmitted light process is provided with the sheet glass (12) that is used for temperature-compensating.
3. the differential phase shift keying demodulator based on the etalon structure according to claim 1, it is characterized in that, the top of described parallel plate (4) is respectively arranged with the input collimater (1) of input optical signal, and exports first output collimator (2) and second output collimator (3) of the coupling of light signal direction with two-way.
4. the differential phase shift keying demodulator based on the etalon structure according to claim 1, it is characterized in that, the position that is positioned at the secondary optical signal transmissive process of highly reflecting films (7) one sides on the upper surface of described glass film plates (6) is coated with anti-reflection film (11), and the position of glass film plates (6) lower surface secondary transmitted light process also is coated with anti-reflection film (11).
5. the differential phase shift keying demodulator based on the etalon structure according to claim 4, it is characterized in that, the top of described parallel plate (4) is respectively arranged with the input collimater (1) of input optical signal, and with first output collimator (2) of one tunnel output light signal direction coupling, the below of described glass film plates (6) is provided with second output collimator (3) with another road output light signal direction coupling.
6. the differential phase shift keying demodulator based on the etalon structure according to claim 1, it is characterized in that, between described parallel plate (4) and the glass film plates (6), transmitted light process the position by earlier to after set gradually shift component (10) and be used for the sheet glass (12) of temperature-compensating, be respectively arranged with the phase adjusted sheet (9) that is used for phase-adjusted ± π/4 on the light path of sheet glass (12) lower end and on the reflected light path on sheet glass (12) right side, the two sides of the phase adjusted sheet (9) of described two ± π/4 all is coated with anti-reflection film.
7. the differential phase shift keying demodulator based on the etalon structure according to claim 6, it is characterized in that, the top of described parallel plate (4) is respectively arranged with the input collimater (1) of input optical signal, export first output collimator (2) and the 3rd output collimator (2 ') of the coupling of light signal direction with two-way, and export second output collimator (3) and the 4th output collimator (3 ') of the coupling of light signal direction with other two-way.
8. the differential phase shift keying demodulator based on the etalon structure according to claim 6 is characterized in that, the position that is positioned at three optical signal transmissive processes of highly reflecting films (7) one sides on the upper surface of described glass film plates (6) is coated with anti-reflection film (11).The position of three transmitted light processes of glass film plates (6) lower surface is coated with anti-reflection film (11).
9. the differential phase shift keying demodulator based on the etalon structure according to claim 8, it is characterized in that, the top of described parallel plate (4) is respectively arranged with the input collimater (1) of input optical signal, and with first output collimator (2) and the 3rd output collimator (2 ') of two-way output light signal direction coupling, the below of described glass film plates (6) is provided with second output collimator (3) and the 4th output collimator (3 ') that is coupled with two-way output light signal direction in addition.
10. according to claim 1 or 4 or 8 described differential phase shift keying demodulators, it is characterized in that the width of described each coatings is by position and the spot size decision of hot spot on parallel plate (4) and glass film plates (6) based on the etalon structure.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101799611A (en) * | 2010-01-12 | 2010-08-11 | 珠海保税区光联通讯技术有限公司 | Zero-heat differential phase shift keying demodulator |
| WO2011063750A1 (en) * | 2009-11-25 | 2011-06-03 | 华为技术有限公司 | Optical demodulator |
-
2008
- 2008-12-30 CN CNU2008201451145U patent/CN201341138Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011063750A1 (en) * | 2009-11-25 | 2011-06-03 | 华为技术有限公司 | Optical demodulator |
| EP2431805A1 (en) * | 2009-11-25 | 2012-03-21 | Huawei Technologies Co., Ltd. | Optical demodulator |
| EP2431805A4 (en) * | 2009-11-25 | 2013-01-09 | Huawei Tech Co Ltd | Optical demodulator |
| US8411350B2 (en) | 2009-11-25 | 2013-04-02 | Huawei Technologies Co., Ltd. | Optical demodulator |
| CN102073190B (en) * | 2009-11-25 | 2013-08-07 | 华为技术有限公司 | Optical demodulator |
| CN101799611A (en) * | 2010-01-12 | 2010-08-11 | 珠海保税区光联通讯技术有限公司 | Zero-heat differential phase shift keying demodulator |
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