CN203732814U - Optical comb filter with low dispersion - Google Patents
Optical comb filter with low dispersion Download PDFInfo
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- CN203732814U CN203732814U CN201420124001.2U CN201420124001U CN203732814U CN 203732814 U CN203732814 U CN 203732814U CN 201420124001 U CN201420124001 U CN 201420124001U CN 203732814 U CN203732814 U CN 203732814U
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- phase delay
- delay chip
- beam splitter
- polarizing beam
- light path
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Abstract
The utility model relates to an optical comb filter which comprises an input unit, a first lambda/2 phase retarder and a first polarizing beam splitter which are successively arranged along a light-path input direction. A first lambda/4 phase retarder and a first reflector plate are successively arranged along a reflected light path. A second lambda/4 phase retarder and a first GT cavity are successively arranged along a transmission light path. A second lambda/2 phase retarder and a second polarizing beam splitter are successively arranged along a light-path output direction. A third lambda/4 phase retarder and a second GT cavity are successively arranged along a reflected light path of the second polarizing beam splitter. A fourth lambda/4 phase retarder and a second reflector plate are successively arranged along a transmission light path of the second polarizing beam splitter. A third lambda/2 phase retarder, a fourth lambda/2 phase retarder, an odd-even channel polarizing beam splitter and an output unit are successively arranged along an output light-path of the second polarizing beam splitter. By the above optical comb filter, two times of filtering can be realized, and chromatic dispersion caused by two times of filtering can be compensated.
Description
Technical field
The utility model relates to optical communication device technical field, particularly a kind of optical interleaver with low dispersion.
Background technology
At present, according to the regulation of International Telecommunications Union (ITU), the interval of channel is all at 100Hz or 200Hz, if want, original system is carried out to low price dilatation, the first-selected optical interleaver of people, because or else it can change on the basis of existing equipment and system, undertaken by the method that changes channel spacing.The function of optical interleaver is that the equally spaced lightwave signal of row is alternately divided into odd and even number channel two column signals by expanding channel spacing, and channel spacing becomes original twice, i.e. demultiplexing; Or two column signals are multiplexed with to row by dwindling channel spacing.Can or else change on the basis of existing equipment and carry out dilatation due to optical interleaver, save spending.Therefore, the upgrading of optical interleaver to existing optical communication wavelength-division multiplex system, has very important effect.The technology of making at present comb filter mainly contains: 1. capable based on birefringece crystal polarized light interference; 2. based on glass sheet polarized light interference type; 3. based on Michelson-GT chamber interferometer type (Michelson-Gires-Tournois Interferometer is called for short MGTI type); 4. based on birefringence GT chamber polarized light interference type (BirefringentGires-TournoisInterfermeter is called for short BGTI type).
Wherein, based on the comb filter of birefringence GT chamber polarized light interference type, its dispersion is almost nil in passband, thereby is widely used in 40G system.But this kind of structure, comprises birefringece crystal, and cost is higher, and need to realize temperature compensation with two or more crystal, technique is more complicated.
Utility model content
The utility model provides a kind of comb filter of polarized light interference type of cost-saving, volume miniaturization.
In order to realize described object, the utility model provides a kind of optical interleaver with low dispersion, includes the input unit (1-1), λ/2 phase delay chip (2-1), the first polarizing beam splitter (4-1) that set gradually along light path input direction; Along setting gradually λ/4 phase delay chip (3-1), the first reflector plate (5-1) on the reflected light path of the first polarizing beam splitter (4-1); Along setting gradually the 2nd λ/4 phase delay chip (3-2), a GT chamber (6-1) on the transmitted light path of the first polarizing beam splitter (4-1); Set gradually the 2nd λ/2 phase delay chip (2-2), the second polarizing beam splitter (4-2) along the light path outbound course of the first polarizing beam splitter (4-1); Set gradually the 3rd λ/4 phase delay chip (3-3), the 2nd GT chamber (6-2) along the reflected light path of the second polarizing beam splitter (4-2); Set gradually the 4th λ/4 phase delay chip (3-4) along the transmitted light path of the second polarizing beam splitter (4-2); The second reflector plate (5-2); Set gradually the 3rd λ/2 phase delay chip (2-3), the 4th λ/2 phase delay chip (2-4), odd-even channel polarizing beam splitter (1-3), follower (1-2) along the output light path of the second polarizing beam splitter (4-2).
Wherein, preferred implementation is: input unit (1-1) includes the first optical fiber collimator (8-1), the first polarization beam apparatus (7-1), the first refractive prism (9-1) and sets gradually.Wherein, preferred implementation is: follower (1-2) includes the second polarization beam apparatus (7-2), the second refractive prism (9-2), the second optical fiber collimator (8-2), the 3rd optical fiber collimator (8-3).
Wherein, preferred implementation is: the first polarizing beam splitter (4-1), the second polarizing beam splitter (4-2) are made up of PBS prism, and are coated with PBS film in the diagonal plane of PBS prism.
Wherein, preferred implementation is: λ/4 phase delay chip (3-1), the 2nd λ/4 phase delay chip (3-2), the 3rd λ/4 phase delay chip (3-3), the 4th λ/4 phase delay chip (3-4) all adopt quartz wave-plate, and its optical axis direction is all set to 45 °.
Wherein, preferred implementation is: λ/2 phase delay chip (2-1), the 2nd λ/2 phase delay chip (2-2), the 3rd λ/2 phase delay chip (2-3) and the 4th λ/2 phase delay chip (2-4) all adopt quartz wave-plate, and wherein the optical axis direction of λ/2 phase delay chip (2-1) is set to 22.5 °, the optical axis direction of the 4th λ/2 phase delay chip (2-4) is set to 45 °.
Wherein, preferred implementation is: the FSR in a GT chamber (6-1) is set to 100GHz, and the FSR in the 2nd GT chamber (6-2) be set to a GT chamber (6-1) FSR 1/2nd.
Implement the optical interleaver with low dispersion of the present utility model, there is following beneficial effect: 1. the comb filter based on birefringence GT chamber polarized light interference type, can realize twice filtering; 2. utilize light path to produce contrary dispersion and compensate the dispersion that twice filtering produces, thereby accomplish that bandwidth internal dispersion is less than 20ps/nm; 3. reduce production costs.
Brief description of the drawings
Below in conjunction with drawings and Examples, structure of the present utility model is further illustrated.
Fig. 1 is the one-piece construction schematic diagram of the optical interleaver of low dispersion of the present utility model.
Fig. 2 a is the structure of input unit 1-1.
Fig. 2 b is the structure of follower 1-2.
Fig. 3 is the light channel structure schematic diagram of the optical interleaver of low dispersion of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the principle of work of the optical interleaver that the utlity model has low dispersion is described further.
As shown in Figure 1, there is the optical interleaver of low dispersion, include: the input unit 1-1, a λ/2 phase delay chip 2-1, the first polarizing beam splitter 4-1 that set gradually along light path input direction; Along setting gradually a λ/4 phase delay chip 3-1, the first reflector plate 5-1 on the reflected light path of the first polarizing beam splitter 4-1; Along setting gradually the 2nd λ/4 phase delay chip 3-2, a GT chamber 6-1 on the transmitted light path of the first polarizing beam splitter 4-1; Set gradually the 2nd λ/2 phase delay chip 2-2, the second polarizing beam splitter 4-2 along the light path outbound course of the first polarizing beam splitter 4-1.Set gradually the 3rd λ/4 phase delay chip 3-3, the 2nd GT chamber 6-2 along the reflected light path of the second polarizing beam splitter 4-2; Set gradually the 4th λ/4 phase delay chip 3-4 along the transmitted light path of the second polarizing beam splitter 4-2; The second reflector plate 5-2; Set gradually the 3rd λ/2 phase delay chip 2-3, the 4th λ/2 phase delay chip 2-4, odd-even channel polarizing beam splitter 1-3, follower 1-2 along the output light path of the second polarizing beam splitter 4-2.
Above-mentioned optical component can be arranged on a base plate, and base plate can be metal material, can be also glass material; Also can connect by optical cement, make more compact structure.
Fig. 2 a is the structure of input unit 1-1, and described input unit 1-1 includes the first optical fiber collimator 8-1, the first polarization beam apparatus 7-1, the first refractive prism 9-1 sets gradually.Fig. 2 b is the structure of follower 1-2, and described follower 1-2 includes the second optical fiber collimator 8-2, the second polarization beam apparatus 7-2, the second refractive prism 9-2, the 3rd optical fiber collimator 8-3.
Please also refer to Fig. 3, the light channel structure schematic diagram of the optical interleaver that Fig. 3 is low dispersion of the present utility model.Light beam is resolved into optical fiber 11a to the optical texture of input unit 1-1 and 12a two restraints polarized light, and the polarization direction of polarized light 11a and 12a is orthogonal.Before entering follower 1-2, light 11a becomes two-beam 11b and 12b, wherein the polarization direction of light beam 11b and 12b is orthogonal, after light beam 11b and 12b the second polarization beam apparatus 7-2, the second refractive prism 9-2 via follower 1-2, exported by the second optical fiber collimator 8-2; Before entering follower 1-2, light 12a becomes two-beam 11c and 12c, wherein the polarization direction of light beam 11c and 12c is orthogonal, after light beam 11c and 12c the second polarization beam apparatus 7-2, the second refractive prism 9-2 via follower 1-2, exported by the 3rd optical fiber collimator 8-3.
The first polarizing beam splitter 4-1 described in the utility model and the second polarizing beam splitter 4-2 form by PBS prism, and described PBS prism can be square.In the diagonal plane of described PBS prism, be coated with PBS film.As shown in Figure 1, the diagonal plane of the first polarizing beam splitter 4-1 is coated with PBS film, and this diagonal plane is perpendicular to paper, and the intersection of paper is exactly the oblique line of the first polarizing beam splitter 4-1 in figure; The second polarizing beam splitter 4-2 is identical with the first polarizing beam splitter 4-1, does not repeat them here.
Described a λ/4 phase delay chip 3-1, the 2nd λ/4 phase delay chip 3-2, the 3rd λ/4 phase delay chip 3-3, the 4th λ/4 phase delay chip 3-4 all adopt quartz wave-plate, and its optical axis direction is set to 45 °.Same, the one λ/2 phase delay chip 2-1, the 2nd λ/2 phase delay chip 2-2, the 3rd λ/2 phase delay chip 2-3 and the 4th λ/2 phase delay chip 2-4 all adopt quartz wave-plate, and wherein the optical axis direction of a λ/2 phase delay chip 2-1 is set to 22.5 °, the optical axis direction of the 4th λ/2 phase delay chip 2-4 is set to 45 °.
For the optical interleaver of 50G/100GHz, the FSR of a GT chamber 6-1 is set to 100GHz, and the FSR of the 2nd GT chamber 6-2 be set to a GT chamber 6-1 FSR 1/2nd.
In the utility model, input unit 1-1 and follower 1-2 transmit and receive for light beam; The one λ/4 phase delay chip 3-1, the 2nd λ/4 phase delay chip 3-2, the 3rd λ/4 phase delay chip 3-3, the 4th λ/4 phase delay chip 3-4, a λ/2 phase delay chip 2-1, the 2nd λ/2 phase delay chip 2-2, the 3rd λ/2 phase delay chip 2-3 and the 4th λ/2 phase delay chip 2-4 are to reach the effect that changes light polarization for generation of phase delay; The first polarizing beam splitter 4-1 and the second polarizing beam splitter 4-2 are for the travel path of this change polarized light, and transmission is reflected or occurred in the light beam of different polarization states or generation; The one GT chamber 6-1 and the 2nd GT chamber 6-2 are respectively used to produce the effect of additional dispersion and interference filter.
Arbitrary polarized light can be decomposed into the linearly polarized light of mutually perpendicular two coordination phases, perpendicular to the plane of incidence (principal plane) be parallel to the plane of incidence (principal plane) both direction, be s ripple (with having in circle × symbol represent) perpendicular to the plane of incidence (principal plane), be parallel to the plane of incidence (principal plane) for p ripple (with having in circle-symbol represent).Light path shown in Fig. 1 specifically describes as follows, light is through input unit 1-1 output, output light is broken down into the two mutually perpendicular linearly polarized lights in bundle polarization direction, be light 11a and 12a, wherein light 11a is s ripple, light 12a is p ripple, enter after a λ/2 phase delay chip 2-1, wherein, light 11a is broken down into s ripple and p ripple, enter the first polarizing beam splitter 4-1, wherein s ripple enters a λ/4 phase delay chip 3-1 via the first polarizing beam splitter 4-1 reflection, enter again the first reflector plate 5-1, after reflecting, the first reflector plate 5-1 becomes p ripple through a λ/4 phase delay chip 3-1 again, and then incide the first polarizing beam splitter 4-1, p ripple is transmitted to the 2nd λ/4 phase delay chip 3-2 via the first polarizing beam splitter 4-1 simultaneously, enter again a GT chamber 6-1, after a GT chamber 6-1 reflects, become s ripple through the 2nd λ/4 phase delay chip 3-2 again, and then incide the first polarizing beam splitter 4-1.Equally, concerning light 12a, after a λ/2 phase delay chip 2-1, be broken down into equally s ripple and p ripple, identical with the light path of light 11a, again repeat no more.Now, have again p ripple via the existing s ripple of light beam of the first polarizing beam splitter 4-1, light beam via the 2nd λ/2 phase delay chip 2-2, enters the second polarizing beam splitter 4-2 again.Light beam enters the second polarizing beam splitter 4-2, wherein s ripple enters the 3rd λ/4 phase delay chip 3-3 via the second polarizing beam splitter 4-2 reflection, enter again the 2nd GT chamber 6-2, after the 2nd GT chamber 6-2 reflects, become p ripple through the 3rd λ/4 phase delay chip 3-3 again, and then incide the second polarizing beam splitter 4-2; P ripple is transmitted to the 4th λ/4 phase delay chip 3-4 via the second polarizing beam splitter 4-2 simultaneously, enter again the second reflector plate 5-2, after the second reflector plate 5-2 reflects, become s ripple through the 4th λ/4 phase delay chip 3-4 again, and then incide the second polarizing beam splitter 4-2.Now, have again p ripple via the existing s ripple of light beam of the second polarizing beam splitter 4-2, light beam by after the 3rd λ/2 phase delay chip 2-3, enters after the 4th λ/2 phase delay chip 2-4 again, then enters odd-even channel polarizing beam splitter 1-3; After odd-even channel polarizing beam splitter 1-3, again via the 3rd λ/2 phase delay chip 2-3, now in light beam, not only comprise s ripple but also comprise p ripple, then via being exported by follower 1-2 after the second polarizing beam splitter 4-2, the 2nd λ/2 phase delay chip 2-2, the first polarizing beam splitter 4-1.
Implement the optical interleaver with low dispersion of the present utility model, there is following beneficial effect: 1. the comb filter based on birefringence GT chamber polarized light interference type, can realize twice filtering; 2. utilize light path to produce contrary dispersion and compensate the dispersion that twice filtering produces, thereby accomplish that bandwidth internal dispersion is less than 20ps/nm; 3. reduce production costs.
As described above, be only the utility model most preferred embodiment, and not for limiting scope of the present utility model, all equivalences of doing according to the utility model claim change or modify, and are all the utility model and contain.
Claims (9)
1. an optical interleaver with low dispersion, is characterized in that, the input unit (1-1), λ/2 phase delay chip (2-1), the first polarizing beam splitter (4-1) that set gradually along light path input direction; Along setting gradually λ/4 phase delay chip (3-1), the first reflector plate (5-1) on the reflected light path of the first polarizing beam splitter (4-1); Along setting gradually the 2nd λ/4 phase delay chip (3-2), a GT chamber (6-1) on the transmitted light path of the first polarizing beam splitter (4-1); Set gradually the 2nd λ/2 phase delay chip (2-2), the second polarizing beam splitter (4-2) along the light path outbound course of the first polarizing beam splitter (4-1); Set gradually the 3rd λ/4 phase delay chip (3-3), the 2nd GT chamber (6-2) along the reflected light path of the second polarizing beam splitter (4-2); Set gradually the 4th λ/4 phase delay chip (3-4) along the transmitted light path of the second polarizing beam splitter (4-2); The second reflector plate (5-2); Set gradually the 3rd λ/2 phase delay chip (2-3), the 4th λ/2 phase delay chip (2-4), odd-even channel polarizing beam splitter (1-3), follower (1-2) along the output light path of the second polarizing beam splitter (4-2).
2. an optical interleaver for low dispersion as claimed in claim 1, is characterized in that: described input unit (1-1) includes the first optical fiber collimator (8-1), the first polarization beam apparatus (7-1), the first refractive prism (9-1) and sets gradually.
3. an optical interleaver for low dispersion as claimed in claim 1, is characterized in that: described follower (1-2) includes the second polarization beam apparatus (7-2), the second refractive prism (9-2), the second optical fiber collimator (8-2), the 3rd optical fiber collimator (8-3).
4. an optical interleaver for low dispersion as claimed in claim 1, is characterized in that: described the first polarizing beam splitter (4-1) is made up of PBS prism.
5. an optical interleaver for low dispersion as claimed in claim 1, is characterized in that: described the second polarizing beam splitter (4-2) is made up of PBS prism.
6. an optical interleaver for the low dispersion as described in claim 4 or 5, is characterized in that: in the diagonal plane of described PBS prism, be coated with PBS film.
7. the optical interleaver of a low dispersion as claimed in claim 1, it is characterized in that: described λ/4 phase delay chip (3-1), the 2nd λ/4 phase delay chip (3-2), the 3rd λ/4 phase delay chip (3-3), the 4th λ/4 phase delay chip (3-4) all adopt quartz wave-plate, and its optical axis direction is all set to 45 °.
8. the optical interleaver of a low dispersion as claimed in claim 1, it is characterized in that: λ/2 phase delay chip (2-1), the 2nd λ/2 phase delay chip (2-2), the 3rd λ/2 phase delay chip (2-3) and the 4th λ/2 phase delay chip (2-4) all adopt quartz wave-plate, and wherein the optical axis direction of λ/2 phase delay chip (2-1) is set to 22.5 °, the optical axis direction of the 4th λ/2 phase delay chip (2-4) is set to 45 °.
9. an optical interleaver for low dispersion as claimed in claim 1, is characterized in that: the FSR in a GT chamber (6-1) is set to 100GHz, and the FSR in the 2nd GT chamber (6-2) be set to a GT chamber (6-1) FSR 1/2nd.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420124001.2U CN203732814U (en) | 2014-03-19 | 2014-03-19 | Optical comb filter with low dispersion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420124001.2U CN203732814U (en) | 2014-03-19 | 2014-03-19 | Optical comb filter with low dispersion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203732814U true CN203732814U (en) | 2014-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420124001.2U Expired - Fee Related CN203732814U (en) | 2014-03-19 | 2014-03-19 | Optical comb filter with low dispersion |
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| Country | Link |
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| CN (1) | CN203732814U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016082226A1 (en) * | 2014-11-29 | 2016-06-02 | 华为技术有限公司 | Phase retarder and optical comb filter thereof |
| CN114660694A (en) * | 2022-03-24 | 2022-06-24 | 武汉光迅科技股份有限公司 | Depolarizer |
-
2014
- 2014-03-19 CN CN201420124001.2U patent/CN203732814U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016082226A1 (en) * | 2014-11-29 | 2016-06-02 | 华为技术有限公司 | Phase retarder and optical comb filter thereof |
| US10866350B2 (en) | 2014-11-29 | 2020-12-15 | Huawei Technologies Co., Ltd. | Phase retarder and optical comb filter thereof |
| CN114660694A (en) * | 2022-03-24 | 2022-06-24 | 武汉光迅科技股份有限公司 | Depolarizer |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140723 Termination date: 20190319 |
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| CF01 | Termination of patent right due to non-payment of annual fee |