CN205539578U - Pectination wavelength division multiplexer for optical communication - Google Patents

Abstract

The utility model provides a pectination wavelength division multiplexer for optical communication, included part, G partially T interferometer part, light beam one -way transmission control section and polarized light receiving part transmit the incident light and give play inclined to one side part, partially partially will rise the incident light alternaties into two way linearly polarized light that the polarization direction is the same, then passes through G T interferometer part reaches light beam one -way transmission control section will two way linearly polarized light carry out filtering respectively to convert orthogonal strange passageway polarized light of the polarization direction and even passageway polarized light back reflection to, strange passageway polarized light and even passageway polarized light difference to re -enter the after will reflecting G filtering is carried out to T interferometer part, and the reflection back gets into polarized light receiving part, polarized light receiving part will say that polarized light and even passageway polarized light alternate to two way linearly polarized light and the couplingout of the polarization direction quadrature. The utility model provides high wave form overall stability has simplified device structure, the cost is reduced.

Description

A kind of optical communication comb type wavelength-division multiplexer

Technical field

The utility model relates to optical communication technology field, particularly relates to a kind of optical communication pectination wavelength-division multiplex Device.

Background technology

Comb type wavelength-division multiplexer (interleaver) is again light intersection multiplexing demultiplexing device, is that one is used in The dense wave division multipurpose (DWDM:Dense Wavelength Division Multiplexing) of fiber optic communication A kind of optical router in system, also referred to as comb filter.The demultiplexing function of interleaver is Single group input DWDM optical signal is resolved into two groups of odd-even channel signal outputs, and two groups of output signals Channel spacing doubles input optical signal channel spacing.It makes the DWDM system of narrower channel spacing System, such as 100GHz (or 50GHz), can demultiplex into channel spacing further is 200GHz (or 100GHz) More loose dwdm system.

Owing to tradition coating technique can not meet in current dwdm system higher frequency wavelength interval Demand, the important devices during then interleaver device has become as optical communication network, at current optical communication Network is widely used.Scale in particular with 10G, 40G network is commercial, to channel The requirement at interval is more and more higher, and interleaver device it is also proposed the highest requirement therewith: channel Be spaced closeer, Dispersive parameter is higher.These all manufactures to interleaver bring new technical problem.

The interleaver technology of main flow mainly has crystal birefringence type, Mach-Zender interferometer at present Type and birefringence G-T etalon type etc..Wherein, first two technology, due to the problem such as cost, volume, In terms of realizing higher channel spacing, difficulty is the biggest；And the birefringence G-T standard of the third technology Tool type interleaver, has the advantages such as band is wide, top flat, volume are little, easy for installation so that It is at home and abroad favourably welcome on market.But, owing to the interband of single-stage G-T type interleaver is isolated Degree is relatively big, and only tens dB can not meet real requirement, and two-stage structure can reach 30-40dB, Existing commercial birefringence G-T etalon type interleaver is essentially two-stage structure.In existing skill In art, two-stage structure has all used the G-T etalon of at least two, is so making G-T standard During tool, there will be difference unavoidably, and this species diversity is all that ratio is more sensitive for interleaver, it Parity channel waveform can be caused to occur significantly different；And device volume is relatively big, equipment adjustment is the most difficult, Thus it is the best to result in performance, relatively costly.

So, in the current situation, it is achieved a kind of low cost, high stability, identical parity channel are defeated Going out waveform, the comb type wavelength-division multiplexer that other optical indexes are excellent is necessary.

Summary of the invention

The technical problems to be solved in the utility model, is to provide a kind of optical communication pectination wavelength-division multiplex Device, parity channel output waveform is consistent, and waveform resistance to overturning improves, and simplifies the structure of device, fall Low debugging assembly difficulty, improves the reliability of product and reduces cost.

The utility model is achieved in that

A kind of optical communication comb type wavelength-division multiplexer, described comb type wavelength-division multiplexer include being polarized part, G-T interferometer part, light beam one-way transmission control part and polarised light receiving portion, by incident light transmission Be polarized part described in giving, described in be polarized part described incident light be transformed into the two-route wire that polarization direction is identical Polarised light, then controls part by described by described G-T interferometer part and described light beam one-way transmission Two-route wire polarised light is filtered respectively, and be converted into the mutually perpendicular strange passage polarised light in polarization direction and Even passage polarised light back reflection, enters the most again by the strange passage polarised light after reflection and even passage polarised light Enter described G-T interferometer part to be filtered, after reflection, enter described polarised light receiving portion, described partially The two-route wire that road polarised light and even passage polarised light are transformed to polarization direction orthogonal by the light receiving part that shakes is inclined Shake light couple output.

Further, it is polarized part described in and includes that the second single optical fiber calibrator, the second birefringence walk off crystal And the 2nd 1/2 wave plate, described G-T interferometer part includes that the first polarization splitting prism is to, the second polarization Amici prism to, the one 3/4 wave plate, 5/8 wave plate, the 2nd 3/4 wave plate and G-T etalon, described Light beam one-way transmission control part includes the 4th 1/2 wave plate and Faraday rotation sheet, and described polarised light receives Part includes strange channel reception part and even channel reception part, and described strange channel reception part includes the 3rd Single optical fiber calibrator, the 3rd birefringence walk off crystal and the 3rd 1/2 wave plate, described even channel reception part Crystal and the one 1/2 wave plate is walked off including the first single optical fiber calibrator, the first birefringence, the described 2nd 3/4 Wave plate is arranged in described G-T etalon；

The incident light of input is incident from described second single optical fiber calibrator, walks off crystal through described second After resolve into two-route wire polarised light, by wherein deviateing described second, to walk off that route of crystal horizontal axis inclined Shake light through described 2nd 1/2 wave plate rotate after, its polarization direction walks off crystal water with being positioned at described second The polarization direction of flat that axial route polarised light is identical, and this linearly polarized light sequentially passes through described first polarization Amici prism to, described 4th 1/2 wave plate, described faraday rotator, described second polarization spectro rib Mirror, to after, described 5/8 wave plate, enters described G-T etalon and described 2nd 3/4 wave plate is filtered, The flashlight of the flashlight of mutually perpendicular for polarization direction strange passage and even passage is screened；After reflection When passing sequentially through described 5/8 wave plate and described second polarization splitting prism pair, by described second polarization spectro After prism again passes by described 5/8 wave plate to the flashlight of the strange passage of reflection output, second time enters described G-T etalon and described 2nd 3/4 wave plate are filtered, then sequentially pass through described 5/8 wave plate after reflection And described second polarization splitting prism pair, deviate the described 3rd that route polarization walking off crystal horizontal axis Light, after described 3rd 1/2 wave plate rotates, and is positioned at the described 3rd that road walking off crystal horizontal axis Linearly polarized light walks off after crystal is coupled into described 3rd single optical fiber calibrator through described 3rd birefringence, then Enter the strange channel reception end of described comb type wavelength-division multiplexer；Meanwhile, by described second polarization splitting prism The flashlight of the even passage of transmission output is again passed by described faraday rotator, described 4th 1/2 ripple After sheet and described first polarization splitting prism are to reflection, sequentially pass through described one 3/4 wave plate and described 5/8 Wave plate second time enters described G-T etalon and described 2nd 3/4 wave plate is filtered, and depends on after reflection again Secondary through described 5/8 wave plate, described one 3/4 wave plate and described first polarization splitting prism pair, deviation Described first walks off that route polarised light of crystal horizontal axis after described one 1/2 wave plate rotates, Walk off through described first birefringence with being positioned at described first that route polarised light walking off crystal horizontal axis After crystal is coupled into described first single optical fiber calibrator, the idol entering back into described comb type wavelength-division multiplexer is led to Road receiving terminal.

Further, it is polarized part described in and includes that the first single optical fiber calibrator, the first birefringence walk off crystal And the one 1/2 wave plate, described G-T interferometer part includes the first polarization splitting prism, the second polarization point Light prism, the first right-angle prism, the second right-angle prism, the first zero degree completely reflecting mirror, the second zero degree are all-trans Penetrate mirror, the one 3/4 wave plate, 5/8 wave plate, the 2nd 3/4 wave plate and G-T etalon, described light beam list The 4th 1/2 wave plate and Faraday rotation sheet, described polarised light acceptance division subpackage is included to transmission control part Including strange channel reception part and even channel reception part, described strange channel reception part includes the 3rd single fiber Collimater, the 3rd birefringence walk off crystal and the 3rd 1/2 wave plate, and described even channel reception part includes Two single optical fiber calibrators, the second birefringence walk off crystal and the 2nd 1/2 wave plate, described 2nd 3/4 wave plate 220 are arranged in described G-T etalon；

The incident light of input is incident from described first single optical fiber calibrator, walks off crystal through described first After resolve into two-route wire polarised light, by wherein deviateing described first, to walk off that route of crystal horizontal axis inclined Shake light through described 1st wave plate rotate after, its polarization direction walks off crystal water with being positioned at described first The polarization direction of flat that axial route polarised light is identical, and this linearly polarized light sequentially passes through described first polarization Amici prism, described 4th 1/2 wave plate, described faraday rotator, described second polarization splitting prism To after, described 5/8 wave plate, enter described G-T etalon and described 2nd 3/4 wave plate be filtered, The flashlight of the flashlight of mutually perpendicular for polarization direction strange passage and even passage is screened；Through described After the flashlight of the strange passage of G-T etalon reflection and the flashlight of even passage produce a deviation angle, depend on Secondary incide described 5/8 wave plate and described second polarization splitting prism, by described second polarization splitting prism The flashlight of the strange passage of reflection output sequentially enters described second right-angle prism and described second zero degree is complete Speculum total reflection after, then sequentially pass through described second right-angle prism, described second polarization splitting prism and After described 5/8 wave plate, second time enters described G-T etalon and described 2nd 3/4 wave plate is filtered, Sequentially pass through described 5/8 wave plate and described second polarization splitting prism after reflection again, deviate the described 3rd and walk From that route polarised light of crystal horizontal axis after described 3rd 1/2 wave plate rotates, described with being positioned at 3rd that route polarised light walking off crystal horizontal axis walks off crystal through described 3rd birefringence and is coupled into After entering described 3rd single optical fiber calibrator, enter back into the strange channel reception end of described comb type wavelength-division multiplexer； Meanwhile, the flashlight of even passage of described second polarization splitting prism transmission output described the is sequentially passed through After one right-angle prism, described one 3/4 wave plate and described first zero degree completely reflecting mirror total reflection, more successively Through described one 3/4 wave plate, described first right-angle prism, described second polarization splitting prism and described After 5/8 wave plate, second time enters described G-T etalon and described 2nd 3/4 wave plate is filtered, reflection After sequentially pass through described 5/8 wave plate and described second polarization splitting prism, described faraday rotator, institute State the 4th 1/2 wave plate and described first polarization splitting prism secondary reflection again, deviate described second and walk off crystal That route polarised light of horizontal axis, after described 2nd 1/2 wave plate rotates, is walked with being positioned at described second That route polarised light from crystal horizontal axis walks off crystal through described second birefringence and is coupled into described After second single optical fiber calibrator, enter back into the even channel reception end of described comb type wavelength-division multiplexer.

The utility model has the advantage of:

The utility model use G-T etalon, by arrange in input path faraday rotator with 1/2 wave plate, it is achieved the line polarisation of parity channel respectively passes twice through same G-T etalon and is filtered, On the premise of not changing comb type wavelength-division multiplexer (interleaver) other indexs, improve spaced From degree, owing to only employing a G-T etalon, improve the stability of system and the consistent of waveform Property, have that simple in construction, volume be little, debugging make simple, that extensibility is strong, cost of manufacture is low etc. is excellent Point, the comb type wavelength-division multiplexer being particularly well-suited to 50/100G and narrower wavelength interval makes.

Accompanying drawing explanation

The utility model is further described the most in conjunction with the embodiments.

Fig. 1 is that the first embodiment structure of the utility model a kind of optical communication comb type wavelength-division multiplexer is shown It is intended to.

Fig. 2 is that the second example structure of the utility model a kind of optical communication comb type wavelength-division multiplexer is shown It is intended to.

Fig. 3 is the 50/100G structure single filter of the utility model a kind of optical communication comb type wavelength-division multiplexer Waveform schematic diagram.

Fig. 4 is twice filter of 50/100G structure of the utility model a kind of optical communication comb type wavelength-division multiplexer Waveform schematic diagram.

In figure:

First single optical fiber calibrator the 101, second single optical fiber calibrator the 102, the 3rd single optical fiber calibrator 103, First birefringence walks off crystal the 104, second birefringence and walks off crystal the 105, the 3rd birefringence and walk off crystal 106, the one 1/2 wave plate the 107, the 2nd 1/2 wave plate the 108, the 3rd 1/2 wave plate 109, first polarizes Amici prism to the 110, second polarization splitting prism to the 111, the 4th 1/2 wave plate 112, Faraday rotation Sheet the 113, the 1st wave plate 114,5/8 wave plate (or 3/8 wave plate) the 115, the 2nd 3/4 wave plate 116, G-T etalon 117；

First single optical fiber calibrator the 201, second single optical fiber calibrator the 202, the 3rd single optical fiber calibrator 203, First birefringence walks off crystal the 204, second birefringence and walks off crystal the 205, the 3rd birefringence and walk off crystal 206, the one 1/2 wave plate the 207, the 2nd 1/2 wave plate the 208, the 3rd 1/2 wave plate 209, first polarizes Amici prism to the 210, second polarization splitting prism to the 211, the 4th 1/2 wave plate 212, Faraday rotation Sheet the 213, first right-angle prism the 214, second right-angle prism the 215, first zero degree completely reflecting mirror 216, Two zero degree completely reflecting mirrors 217, the one 3/4 wave plate 218,5/8 wave plate (or 3/8 wave plate) 219, 2 3/4 wave plates 220, G-T etalon 221.

Detailed description of the invention

With specific embodiment, the utility model is described in detail below in conjunction with the accompanying drawings.

A kind of optical communication comb type wavelength-division multiplexer of the present utility model, including being polarized part, G-T interference Instrument part, light beam one-way transmission control part and polarised light receiving portion, give described by incident light transmission Partially part, described in be polarized part described incident light be transformed into the two-route wire polarised light that polarization direction is identical, Then part is controlled by described two-route wire by described G-T interferometer part and described light beam one-way transmission Polarised light is filtered respectively, and is converted into the flashlight of the mutually perpendicular strange passage in polarization direction and occasionally leads to The flashlight back reflection in road, the flashlight of the strange passage after reflecting and the flashlight of even passage are the most again Enter described G-T interferometer part to be filtered, after reflection, enter described polarised light receiving portion, institute State polarised light receiving portion and the flashlight of the flashlight of strange passage and even passage is just being transformed to polarization direction Hand over two-route wire polarised light and couple output.

First embodiment:

As it is shown in figure 1, a kind of optical communication comb type wavelength-division multiplexer of the present utility model, it is a kind of straight-through Formula structure, described comb type wavelength-division multiplexer includes first single optical fiber calibrator the 101, second single fiber collimation Device the 102, the 3rd single optical fiber calibrator the 103, first birefringence walks off crystal the 104, second birefringence and walks From crystal the 105, the 3rd birefringence walk off crystal the 106, the 1st wave plate the 107, the 2nd 1/2 wave plate 108, 3rd 1/2 wave plate the 109, first polarization splitting prism to 110 (can be formed by monolithic prism arrangement), Second polarization splitting prism to 111 (can be formed by monolithic prism arrangement), the 4th 1/2 wave plate 112, Faraday rotation sheet the 113, the 1st wave plate 114,5/8 wave plate (or 3/8 wave plate) 115, second 3/4 wave plate 116 and G-T etalon 117 (including front cavity mirror and Effect of Back-Cavity Mirror), described 2nd 3/4 wave plate 116 are arranged in described G-T etalon 117；Wherein, part it is polarized described in by the second single fiber collimation Device the 102, second birefringence walks off crystal the 105 and the 2nd 1/2 wave plate 108 and forms, and described G-T interferes Instrument part by the first polarization splitting prism to the 110, second polarization splitting prism to the 111, the 1st ripple Sheet 114,5/8 wave plate the 115, the 2nd 3/4 wave plate 116 and G-T etalon 117 forms, described light beam One-way transmission control part is made up of the 4th 1/2 wave plate 112 and Faraday rotation sheet 113, described polarization Light receiving part includes strange channel reception part and even channel reception part, described strange channel reception part by 3rd single optical fiber calibrator the 103, the 3rd birefringence walks off crystal the 106 and the 3rd 1/2 wave plate 109 and forms, Described even channel reception part by first single optical fiber calibrator the 101, first birefringence walk off crystal 104 and One 1/2 wave plate 107 forms；

The incident light of input (input optical fibre) is incident from described second single optical fiber calibrator 102, passes through Described second walk off crystal 105 after resolve into two-route wire polarised light, will wherein deviate described second and walk off crystalline substance That route polarised light of body 105 horizontal axis is after described 2nd 1/2 wave plate 108 rotates, and it polarizes Direction and the polarization direction phase being positioned at the described second that route polarised light walking off crystal 105 horizontal axis With, this linearly polarized light sequentially pass through described first polarization splitting prism to 110, described 4th 1/2 wave plate 112, described faraday rotator 113, described second polarization splitting prism to 111, described 5/8 wave plate After (or 3/8 wave plate) 115, enter described G-T etalon 117 and described 2nd 3/4 wave plate 116 It is filtered, the flashlight of the flashlight of mutually perpendicular for polarization direction strange passage and even passage is filtered out Come；Described 5/8 wave plate (or described 3/8 wave plate) 115 and described second polarization is passed sequentially through after reflection When Amici prism is to 111, by described second polarization splitting prism letter to the strange passage of 111 reflection outputs After number light again passes by described 5/8 wave plate (or described 3/8 wave plate) 115, second time enters described G-T Etalon 117 and described 2nd 3/4 wave plate 116 are filtered, then sequentially pass through described 5/8 after reflection Wave plate (or described 3/8 wave plate) 115 and described second polarization splitting prism, to 111, deviate described Three walk off that route polarised light of crystal 106 horizontal axis after described 3rd 1/2 wave plate 109 rotates, That route polarised light of crystal 106 horizontal axis is walked off through described 3rd birefringence with being positioned at the described 3rd Walk off after crystal 106 is coupled into described 3rd single optical fiber calibrator 103, enter back into described pectination wavelength-division The strange channel reception end (output optical fibre) of multiplexer；Meanwhile, by described second polarization splitting prism pair The flashlight of even passage of 111 transmissions outputs again pass by described faraday rotator 113, the described 4th After 1/2 wave plate 112 and described first polarization splitting prism are to 110 reflections, sequentially pass through the described 1st Wave plate 114 and described 5/8 wave plate (or described 3/8 wave plate) 115 second time enter described G-T standard Tool 117 and described 2nd 3/4 wave plate 116 are filtered, and sequentially pass through described 5/8 wave plate after reflection again (or described 3/8 wave plate) 115, described one 3/4 wave plate 114 and described first polarization splitting prism pair 110, deviate described first and walk off that route polarised light of crystal 104 horizontal axis through the described 1st After wave plate 107 rotates, and it is positioned at described first that route polarised light warp walking off crystal 104 horizontal axis Described first birefringence walks off after crystal 104 is coupled into described first single optical fiber calibrator 101, then enters Enter the even channel reception end (output optical fibre) of described comb type wavelength-division multiplexer.

The operation principle of this embodiment is as follows:

The incident light of input (input optical fibre) is incident from described second single optical fiber calibrator 102, passes through Described second walk off crystal 105 after resolve into two-route wire polarised light, represent with solid line and dotted line respectively, its The route polarised light (deviate described second and walk off crystal 105 horizontal axis) that middle dotted line represents is through institute It is converted into the linearly polarized light represented with solid line after stating the 2nd 1/2 wave plate 108 (to be positioned at described second and walk off crystalline substance Body 105 horizontal axis) identical polarization state.Due to two-route wire polarised light independent propagation, mark at G-T The interleaver of quasi-tool type has identical mechanism, so the most only analyzing dotted line therein One tunnel, it is identical with false colour that process is analyzed on a road of solid line.Linearly polarized light sequentially passes through described first polarization Amici prism to 110, described 4th 1/2 wave plate 112 and described faraday rotator 113, described 4 1/2 wave plates 112 and described faraday rotator 113 form light beam one-way transmission control part, it is ensured that Light beam along backtracking will not enter in described second single optical fiber calibrator 102；Finally, described in entering Second polarization splitting prism to 111, described 5/8 wave plate (or described 3/8 wave plate) 115, described G-T Etalon 117 and described 2nd 3/4 wave plate 116, described first polarization splitting prism to 110, described Second polarization splitting prism is to the 111, the 1st wave plate 114, described 5/8 wave plate (or described 3/8 ripple Sheet) 115, described 2nd 3/4 wave plate 116 and described G-T etalon 117 form G-T interferometer portion Point so that o, e light walks off generation phase delay in crystal 105 in described second birefringence, and in institute State the multiple-beam interference realizing o, e light in G-T etalon 117, final polarization direction orthogonal and The flashlight of the strange passage that beam direction is overlapping and the flashlight of even passage are screened out.Work as beam direction Pass sequentially through after the flashlight of overlapping strange passage and the flashlight reflection of even passage described 5/8 wave plate (or Described 3/8 wave plate) 115 and described second polarization splitting prism to 111 time, just by (the most logical with S light The flashlight in road), the mode of the P light flashlight of passage (even) separate, complete one Level G-T etalon interleaver output.

Fig. 3 gives the G-T etalon filtered parity channel of interleaver single of 50/100G Oscillogram, wherein the isolation of adjacency channel is not the highest, about 20dB.

The S light (flashlight of strange passage) exported 111 reflections by described second polarization splitting prism is again Secondary through described 5/8 wave plate (or described 3/8 wave plate) 115 second time enter described G-T etalon 117 And described 2nd 3/4 wave plate 116 is filtered, emergent light is converted to P light (flashlight of even passage), Described 5/8 wave plate (or described 3/8 wave plate) 115 and described second polarization point is sequentially passed through again after reflection Light prism, to 111, deviates the described 3rd and walks off that route polarised light of crystal 106 horizontal axis through institute State after the 3rd 1/2 wave plate 109 is rotated into S (flashlight of strange passage), walk off with being positioned at the described 3rd That route polarised light of crystal 106 horizontal axis walks off crystal 106 through described 3rd birefringence and is coupled into After described 3rd single optical fiber calibrator 103, enter back into the strange channel reception end of described comb type wavelength-division multiplexer (output optical fibre), this road has and carries out S-P-S polarization conversion；In like manner, by described second polarization spectro The P light (flashlight of even passage) that 111 transmissions are exported by prism again passes by described faraday rotator 113, after described 4th 1/2 wave plate 112 and described first polarization splitting prism are to 110 reflections, successively Through described one 3/4 wave plate 114 and described 5/8 wave plate (or described 3/8 wave plate) 115 second time Enter described G-T etalon 117 and described 2nd 3/4 wave plate 116 is filtered, finally, after reflection Sequentially pass through again described 5/8 wave plate (or described 3/8 wave plate) 115, described one 3/4 wave plate 114 and Described first polarization splitting prism, to 110, deviates described first that road walking off crystal 104 horizontal axis Linearly polarized light, after described one 1/2 wave plate 107 rotates, walks off crystal 104 with being positioned at described first That route polarised light of horizontal axis walks off crystal 104 through described first birefringence and is coupled into described After one single optical fiber calibrator 101, enter back into the even channel reception end (output of described comb type wavelength-division multiplexer Optical fiber), this road does not carry out polarization conversion.

Fig. 4 gives the ripple of twice filtered strange passage of G-T etalon interleaver of 50/100G Shape figure, wherein the isolation of adjacency channel significantly improves, about 40dB.

It should be noted that our the computational analysis comb type wavelength-division multiplexer of 50GHz/100GHz, right Stand good in 25GHz/50GHz and narrower passage.The free spectral range of G-T etalon is FSR The chamber that (i.e. filtering interval) determines etalon is long, and formula is as follows:

$FSR=\frac{c}{2\·d}$

Wherein, c is light beam in vacuum, and d is that etalon chamber is long.If FSR=100GHz, can obtain The a length of 1.499mm in chamber.

Compared with prior art, a kind of optical communication comb type wavelength-division multiplexer of the present utility model, have Simple in construction, volume are little, debugging makes the advantages such as simple, extensibility is strong, are particularly well-suited to 50/100G And the comb type wavelength-division multiplexer of narrower wavelength interval makes.

Second embodiment:

As in figure 2 it is shown, a kind of optical communication comb type wavelength-division multiplexer of the present utility model, it it is a kind of reflection Formula structure, described comb type wavelength-division multiplexer includes first single optical fiber calibrator the 201, second single fiber collimation Device the 202, the 3rd single optical fiber calibrator the 203, first birefringence walks off crystal the 204, second birefringence and walks From crystal the 205, the 3rd birefringence walk off crystal the 206, the 1st wave plate the 207, the 2nd 1/2 wave plate 208, 3rd 1/2 wave plate the 209, first polarization splitting prism the 210, second polarization splitting prism the 211, the 4th 1/2 wave plate 212, Faraday rotation sheet the 213, first right-angle prism the 214, second right-angle prism 215, First zero degree completely reflecting mirror the 216, second zero degree completely reflecting mirror the 217, the 1st wave plate 218,5/8 ripple Sheet (or 3/8 wave plate) the 219, the 2nd 3/4 wave plate 220 and G-T etalon 221 (include front cavity mirror and Effect of Back-Cavity Mirror), described 2nd 3/4 wave plate 220 is arranged in described G-T etalon 221；Wherein, institute State to be polarized and partly walked off crystal 204 and the 1st by first single optical fiber calibrator the 201, first birefringence Wave plate 207 forms, and described G-T interferometer part is polarized by the first polarization splitting prism 210, second divides Light prism the 211, first right-angle prism the 214, second right-angle prism the 215, first zero degree completely reflecting mirror 216, Second zero degree completely reflecting mirror the 217, the 1st wave plate 218,5/8 wave plate (or 3/8 wave plate) 219, 2nd 3/4 wave plate 220 and G-T etalon 221 forms, and described light beam one-way transmission controls part by the 4 1/2 wave plates 212 and Faraday rotation sheet 213 form, and described polarised light receiving portion includes strange passage Receiving portion and even channel reception part, described strange channel reception part is by the 3rd single optical fiber calibrator 203, the 3rd birefringence walks off crystal the 306 and the 3rd 1/2 wave plate 309 and forms, described even channel reception Part is walked off crystal the 305 and the 2nd 1/2 wave plate 308 by second single optical fiber calibrator the 302, second birefringence Composition；

The incident light of input (input optical fibre) is incident from described first single optical fiber calibrator 201, passes through Described first walk off crystal 204 after resolve into two-route wire polarised light, will wherein deviate described first and walk off crystalline substance That route polarised light of body 204 horizontal axis is after described one 1/2 wave plate 207 rotates, and it polarizes Direction and the polarization direction phase being positioned at the described first that route polarised light walking off crystal 204 horizontal axis With, this linearly polarized light sequentially pass through described first polarization splitting prism 210, described 4th 1/2 wave plate 212, Described faraday rotator 213, described second polarization splitting prism to 211, described 5/8 wave plate (or 3/8 wave plate) after 219, enter described G-T etalon 221 and described 2nd 3/4 wave plate 220 is carried out Filtering, screens the flashlight of the flashlight of mutually perpendicular for polarization direction strange passage and even passage； One is produced inclined through the flashlight of strange passage of described G-T etalon 221 reflection and the flashlight of even passage After moving angle, incide described 5/8 wave plate (or 3/8 wave plate) 219 and described second polarization point successively Light prism 211, is reflected the flashlight of strange passage of output successively by described second polarization splitting prism 211 After entering described second right-angle prism 215 and described second zero degree completely reflecting mirror 217 total reflection, more successively Through described second right-angle prism 215, described second polarization splitting prism 217 and described 5/8 wave plate (or Described 3/8 wave plate) second time enters described G-T etalon 221 and described 2nd 3/4 wave plate after 219 220 are filtered, then sequentially pass through described 5/8 wave plate (or described 3/8 wave plate) 219 and institute after reflection Stating the second polarization splitting prism 211, deviateing the described 3rd, to walk off that route of crystal 206 horizontal axis inclined Shake light through described 3rd 1/2 wave plate 209 rotate after, walk off crystal 206 level with being positioned at the described 3rd That axial route polarised light walks off crystal 206 through described 3rd birefringence and is coupled into described 3rd list After optical fiber collimator 203, enter back into strange channel reception end (the output light of described comb type wavelength-division multiplexer Fine)；Meanwhile, by the flashlight of the even passage of described second polarization splitting prism 211 transmission output successively Through described first right-angle prism 214, described one 3/4 wave plate 218 and described first zero degree total reflection Mirror 216 total reflection after, then sequentially pass through described one 3/4 wave plate 218, described first right-angle prism 214, After described second polarization splitting prism 211 and described 5/8 wave plate (or described 3/8 wave plate) 219 second Secondary entrance described G-T etalon 221 and described 2nd 3/4 wave plate 220 are filtered, after reflection successively Through described 5/8 wave plate (or described 3/8 wave plate) 219 and described second polarization splitting prism 211, institute State faraday rotator 213, described 4th 1/2 wave plate 212 and described first polarization splitting prism 210 Secondary reflection again, deviates described second and walks off that route polarised light of crystal 205 horizontal axis through described After 2 1/2 wave plates 208 rotate, to walk off that route of crystal 205 horizontal axis inclined with being positioned at described second The light that shakes walks off crystal 205 through described second birefringence and is coupled into described second single optical fiber calibrator 202 After, enter back into the even channel reception end (output optical fibre) of described comb type wavelength-division multiplexer.

Second embodiment is similar with the operation principle of first embodiment, does not repeats them here.

In sum, advantage of the present utility model is as follows:

The utility model use G-T etalon, by arrange in input path faraday rotator with 1/2 wave plate, it is achieved the line polarisation of parity channel respectively passes twice through same G-T etalon and is filtered, On the premise of not changing comb type wavelength-division multiplexer (interleaver) other indexs, improve spaced From degree, owing to only employing a G-T etalon, improve the stability of system and the consistent of waveform Property, have that simple in construction, volume be little, debugging make simple, that extensibility is strong, cost of manufacture is low etc. is excellent Point, the comb type wavelength-division multiplexer being particularly well-suited to 50/100G and narrower wavelength interval makes；Described pectination Wavelength division multiplexer can be reflective structure or straight-through structure, and described comb type wavelength-division multiplexer can be Symmetrical structure or unsymmetric structure, described comb type wavelength-division multiplexer can be isolating construction or overall light Glue bonded structure or part optical cement bonded structure.

Although the foregoing describing detailed description of the invention of the present utility model, but it is familiar with the skill of the art Art personnel should be appreciated that our described specific embodiment is merely exemplary rather than for right The restriction of scope of the present utility model, those of ordinary skill in the art are according to spirit of the present utility model The modification of the equivalence made and change, all should contain of the present utility model claimed In the range of.

Claims (3)

1. null1. an optical communication comb type wavelength-division multiplexer，It is characterized in that: described comb type wavelength-division multiplexer includes being polarized part、G-T interferometer part、Light beam one-way transmission controls part and polarised light receiving portion，It is polarized part described in being given by incident light transmission，Described incident light is transformed into the two-route wire polarised light that polarization direction is identical by the described part that is polarized，Then by described G-T interferometer part and described light beam one-way transmission control part, described two-route wire polarised light is filtered respectively，And it is converted into the mutually perpendicular strange passage polarised light in polarization direction and even passage polarised light back reflection，Strange passage polarised light after reflection and even passage polarised light are again introduced into described G-T interferometer part respectively and are filtered，Described polarised light receiving portion is entered after reflection，Road polarised light and even passage polarised light are transformed to the orthogonal two-route wire polarised light in polarization direction and couple output by described polarised light receiving portion.
2. null2. a kind of optical communication comb type wavelength-division multiplexer as claimed in claim 1，It is characterized in that: described in be polarized part include the second single optical fiber calibrator、Second birefringence walks off crystal and the 2nd 1/2 wave plate，Described G-T interferometer part includes the first polarization splitting prism pair、Second polarization splitting prism pair、One 3/4 wave plate、5/8 wave plate、2nd 3/4 wave plate and G-T etalon，Described light beam one-way transmission control part includes the 4th 1/2 wave plate and Faraday rotation sheet，Described polarised light receiving portion includes strange channel reception part and even channel reception part，Described strange channel reception part includes the 3rd single optical fiber calibrator、3rd birefringence walks off crystal and the 3rd 1/2 wave plate，Described even channel reception part includes the first single optical fiber calibrator、First birefringence walks off crystal and the one 1/2 wave plate，Described 2nd 3/4 wave plate is arranged in described G-T etalon；

   The incident light of input is incident from described second single optical fiber calibrator, two-route wire polarised light is resolved into after described second birefringence walks off crystal, that route polarised light of crystal horizontal axis is walked off after described 2nd 1/2 wave plate rotates by wherein deviateing described second birefringence, its polarization direction is identical with the polarization direction being positioned at that route polarised light that described second birefringence walks off crystal horizontal axis, this linearly polarized light sequentially passes through described first polarization splitting prism pair, described 4th 1/2 wave plate, described faraday rotator, described second polarization splitting prism pair, after described 5/8 wave plate, enter described G-T etalon and described 2nd 3/4 wave plate is filtered, the flashlight of the flashlight of mutually perpendicular for polarization direction strange passage and even passage is screened；When passing sequentially through described 5/8 wave plate and described second polarization splitting prism pair after reflection, after the flashlight of the strange passage of reflection output being again passed by described 5/8 wave plate by described second polarization splitting prism, second time enters described G-T etalon and described 2nd 3/4 wave plate is filtered, described 5/8 wave plate and described second polarization splitting prism pair is sequentially passed through again after reflection, deviate described 3rd birefringence and walk off that route polarised light of crystal horizontal axis after described 3rd 1/2 wave plate rotates, walk off that route polarised light of crystal horizontal axis and walk off after crystal is coupled into described 3rd single optical fiber calibrator with being positioned at described 3rd birefringence through described 3rd birefringence, enter back into the strange channel reception end of described comb type wavelength-division multiplexer；nullSimultaneously，The flashlight of the even passage exported transmission by described second polarization splitting prism again passes by described faraday rotator、After described 4th 1/2 wave plate and described first polarization splitting prism are to reflection，Sequentially pass through described one 3/4 wave plate and described 5/8 wave plate second time enters described G-T etalon and described 2nd 3/4 wave plate is filtered，Described 5/8 wave plate is sequentially passed through again after reflection、Described one 3/4 wave plate and described first polarization splitting prism pair，Deviate described first birefringence and walk off that route polarised light of crystal horizontal axis after described one 1/2 wave plate rotates，Walk off that route polarised light of crystal horizontal axis and walk off after crystal is coupled into described first single optical fiber calibrator with being positioned at described first birefringence through described first birefringence，Enter back into the even channel reception end of described comb type wavelength-division multiplexer.
3. null3. a kind of optical communication comb type wavelength-division multiplexer as claimed in claim 1，It is characterized in that: described in be polarized part include the first single optical fiber calibrator、First birefringence walks off crystal and the one 1/2 wave plate，Described G-T interferometer part includes the first polarization splitting prism、Second polarization splitting prism、First right-angle prism、Second right-angle prism、First zero degree completely reflecting mirror、Second zero degree completely reflecting mirror、One 3/4 wave plate、5/8 wave plate、2nd 3/4 wave plate and G-T etalon，Described light beam one-way transmission control part includes the 4th 1/2 wave plate and Faraday rotation sheet，Described polarised light receiving portion includes strange channel reception part and even channel reception part，Described strange channel reception part includes the 3rd single optical fiber calibrator、3rd birefringence walks off crystal and the 3rd 1/2 wave plate，Described even channel reception part includes the second single optical fiber calibrator、Second birefringence walks off crystal and the 2nd 1/2 wave plate，Described 2nd 3/4 wave plate 220 is arranged in described G-T etalon；

   The incident light of input is incident from described first single optical fiber calibrator, two-route wire polarised light is resolved into after described first birefringence walks off crystal, that route polarised light of crystal horizontal axis is walked off after described one 1/2 wave plate rotates by wherein deviateing described first birefringence, its polarization direction is identical with the polarization direction being positioned at that route polarised light that described first birefringence walks off crystal horizontal axis, this linearly polarized light sequentially passes through described first polarization splitting prism, described 4th 1/2 wave plate, described faraday rotator, described second polarization splitting prism, after described 5/8 wave plate, enter described G-T etalon and described 2nd 3/4 wave plate is filtered, the flashlight of the flashlight of mutually perpendicular for polarization direction strange passage and even passage is screened；nullAfter the flashlight of strange passage of described G-T etalon reflection produces a deviation angle with the flashlight of even passage，Incide described 5/8 wave plate and described second polarization splitting prism successively，After being sequentially entered described second right-angle prism and described second zero degree completely reflecting mirror total reflection by the flashlight of the strange passage of described second polarization splitting prism reflection output，Sequentially pass through described second right-angle prism again、After described second polarization splitting prism and described 5/8 wave plate, second time enters described G-T etalon and described 2nd 3/4 wave plate is filtered，Described 5/8 wave plate and described second polarization splitting prism is sequentially passed through again after reflection，Deviate described 3rd birefringence and walk off that route polarised light of crystal horizontal axis after described 3rd 1/2 wave plate rotates，Walk off that route polarised light of crystal horizontal axis and walk off after crystal is coupled into described 3rd single optical fiber calibrator with being positioned at described 3rd birefringence through described 3rd birefringence，Enter back into the strange channel reception end of described comb type wavelength-division multiplexer；nullSimultaneously，Described first right-angle prism is sequentially passed through by the flashlight of the even passage of described second polarization splitting prism transmission output、After described one 3/4 wave plate and described first zero degree completely reflecting mirror total reflection，Sequentially pass through described one 3/4 wave plate again、Described first right-angle prism、After described second polarization splitting prism and described 5/8 wave plate, second time enters described G-T etalon and described 2nd 3/4 wave plate is filtered，Described 5/8 wave plate and described second polarization splitting prism is sequentially passed through after reflection、Described faraday rotator、Described 4th 1/2 wave plate and described first polarization splitting prism secondary reflection again，Deviate described second birefringence and walk off that route polarised light of crystal horizontal axis after described 2nd 1/2 wave plate rotates，Walk off that route polarised light of crystal horizontal axis and walk off after crystal is coupled into described second single optical fiber calibrator with being positioned at described second birefringence through described second birefringence，Enter back into the even channel reception end of described comb type wavelength-division multiplexer.