CN101881863A - Comb filter - Google Patents
Comb filter Download PDFInfo
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- CN101881863A CN101881863A CN2009100506385A CN200910050638A CN101881863A CN 101881863 A CN101881863 A CN 101881863A CN 2009100506385 A CN2009100506385 A CN 2009100506385A CN 200910050638 A CN200910050638 A CN 200910050638A CN 101881863 A CN101881863 A CN 101881863A
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- prism
- port connector
- comb filter
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- transmission plane
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Abstract
The invention discloses a comb filter, comprising a first port connector, a second port connector, a first filter unit, a second filter unit, a polarization beam splitter and a feedback reflector, wherein a lateral light-leading prism and a ridge prism are arranged between the second port connector and the first filter unit; the lateral light-leading prism comprises a first transmission surface and a second transmission surface which are parallel to each other and a first reflecting surface and a second reflecting surface which are parallel to each other, wherein the first transmission surface and the first filter unit are in optical joint, the second transmission surface and the ridge prism are in optical joint, and the ridge prism and the second port connector are in optical joint. The invention adopts a folding type optical path design to enable all the port connectors to be positioned in the same side, thereby having small volume. By using a lateral light-leading prism to lead the light to the port connector from side direction, the polarization state of the light can not be changed, the structure is simplified and assembling and debugging are more convenient.
Description
Technical field
The present invention relates to a kind of comb filter of optical communication field.
Background technology
Along with the fast development of information communication, the information interchange of voice, image, data increasing.Especially the widespread use of the Internet, people have higher requirement to broadband connections.For in the short as far as possible time, can satisfy the demand of people with low-cost, high-quality system to broadband connections, wavelength-division multiplex (WDM) technology is widely used, wavelength-division multiplex is to increase the number of channel by the principle that different wave length can transmit in same optical fiber, and the transmission of signal is significantly improved.Wavelength-division multiplex can enlarge the optical fiber communication capacity, and does not need to lay new fibre circuit, has reduced the networking expense.
Another approach that improves the Optical Fiber Transmission capacity is further to reduce channel spacing.At present, regulation according to International Telecommunications Union (ITU), the interval of channel is all at 100GHz or 200GHz, if want original system is carried out the low price dilatation, the first-selected optical interleaver of people, because it can be undertaken by the method that changes channel spacing on the basis that does not change existing equipment and system.That is: be the original system of 200GHz to channel spacing, can use the optical interleaver of 100GHz; To channel spacing is the original system of 100GHz, can use the optical interleaver of 50GHz.The function of this comb filter is that the equally spaced lightwave signal of row alternately is divided into odd and even number channel two column signals by enlarging channel spacing, and channel spacing becomes original twice, i.e. demultiplexing; Or two column signals are multiplexed with row by dwindling channel spacing.Because optical interleaver can carry out dilatation on the basis of not changing existing equipment, saved spending.Therefore, optical interleaver has crucial effect to the upgrading of existing optical communication wavelength-division multiplex system.Optical interleaver commonly used at present has: grating type optical fiber, birefringece crystal type, Mach-Zehnder interfere type, resonant cavity type etc.
Chinese invention patent application 200510078136.5 discloses a kind of optical interleaver (optical interleaver) that is used to handle light signal, as shown in Figure 1, it has 3 port ones 02,188,198 that engage with primary filter unit 322 by the corresponding ports connector.Wherein, the port connector 210 that is used for port one 02 comprises: collimating apparatus 212, beam splitter/combiner 214 and wave plate 216 with lens; Be used for the port connector 282 of port one 88, the port connector 292 that is used for port one 98 has the structure similar to 210.In operation as optical demultiplexer, the light signal of odd and even number channel is by may being that the port one 02 of optical fiber enters collimating apparatus 212, beam splitter/combiner can be oriented to the birefringece crystal that can produce the optical axial that light signal leaves on wave plate 216 and makes by having, and wave plate is zero-th order waveplates and linearizing optical axial with polarization vector of two rays that the generation of being oriented to forms by beam splitter/combiner.
The ray of linear polarization then is directed to primary filter unit 322, and primary filter unit 322 comprises polarisation beam division unit and the zero level half-wave plate 124 as primary filter.Harmonic filter unit 340 engages with primary filter unit 322 optically and apply higher harmonic wave on the light signal of handling through primary filter.Be provided with zero-th order waveplates 270 in the front of primary filter unit 322, be provided with zero-th order waveplates 232 in the front of harmonic filter unit 340, zero-th order waveplates 270,232 needn't rotate to an angle primary filter unit 322 and harmonic filter unit 340 when mounted.Optical polarization beam splitter 251 is made up of a parallel-plate and one or more prism, on the respective face of the hypotenuse of prism or parallel-plate, apply polarisation beam division coating, 251 divisions of optical polarization beam splitter come from the odd and even number signal of primary filter unit and harmonic filter unit, odd number signal and even signal are respectively divided the different light beams of two bundle polarization states, feedback reflector device 160 goes back to each beam reflection to harmonic filter unit 340 and primary filter unit 322, and the light beam that returns from primary filter unit 322 is through three beam benders 272 at last, 280,290 are divided into odd even two-way entry port connector 282 respectively, 292.
In above-mentioned this structure, installation site, angle and the relativeness of three beam benders 272,280,290 will directly influence light beam entry port connector 282,292 exactly, and be coupled into odd number signal or even signal respectively in port connector 282,292.Like this, three discrete elements just bother when Installation and Debugging very much, influence efficiency of assembling.
In addition, in above-mentioned this structure, three port connectors the 210,282, the 292nd are installed in the plane side by side, and two filter cells 322,340 are placed vertically with respect to the mounting plane of port connector, the short transverse size that is filter cell 322,340 is bigger, can cause the height of product excessive like this, can not adapt to the requirement of some occasion.
Summary of the invention
The technical problem to be solved in the present invention provide a kind of volume littler, assemble comb filter more easily.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme, a kind of comb filter, comprise first port connector, second port connector, first filter cell, second filter cell, polarisation beam splitter and feedback reflector device, between second port connector and first filter cell, also be provided with a side direction light lead prism and a roof prism, described side direction light lead prism comprises a pair of first transmission plane that is parallel to each other and second transmission plane, also comprise a pair of first reflecting surface that is parallel to each other and second reflecting surface, described first transmission plane and the first filter cell optical junction, second transmission plane and roof prism optical junction, roof prism and the second port connector optical junction.
The invention has the beneficial effects as follows: adopt collapsible light path design, port connector all is positioned at the same side, and volume is little.Adopt a side direction light lead prism that light is led to port connector from side direction, but can not change polarization state of light, simplify the structure, make assembly and adjustment convenient.Adopt unique polarisation beam splitter, light is divided into the mutually perpendicular two-beam of polarization state and exports at diverse location.By roof prism directional light is become a pair of light with certain alternate angle, and the coupling of exporting light by two fine collimating apparatuss.Owing to adopted side direction light lead prism, two filter cells among the present invention can keep flat, thereby reduce the height of product, reduce volume.
Preferably, described first, second port connector includes optical fiber collimator, beam splitting/combiner and wave plate.
Further, the quantity of described second port connector is one, and optical fiber collimator wherein is two fine collimating apparatuss.
Further, described beam splitting/combiner is made by birefringece crystal.
Preferably, the angle of first reflecting surface of described side direction light lead prism and first transmission plane is 45 °.
Preferably, second transmission plane of described side direction light lead prism is provided with the phase compensation sheet.
Preferably, be provided with half-wave plate between described first filter cell and second filter cell, also be provided with half-wave plate between second filter cell and the polarisation beam splitter.
Preferably, described feedback reflector device is a right-angle prism.
Further, described polarisation beam splitter comprises two prisms and is clipped in parallel-plate between the two prisms, applies polarisation beam division coating with the two prisms facing surfaces on the described parallel-plate.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Fig. 1 is the synoptic diagram of a kind of comb filter of the prior art.
Fig. 2 is the front elevation of a kind of comb filter of the present invention.
Fig. 3 is the schematic perspective view of a kind of comb filter of the present invention.
Fig. 4 is the synoptic diagram of side direction light lead prism.
Fig. 5 is the synoptic diagram of polarisation beam splitter and feedback reflector device.
The optical path change synoptic diagram that Fig. 6 is a light signal through roof prism, beam splitting/combiner the time.
Fig. 7 is the vertical view of Fig. 6.
Embodiment
As Fig. 2, shown in Figure 3, a kind of comb filter of the present invention comprises first port connector 10, second port connector 20, and they can be connected with optical fiber, realizes the input and output of light signal.Wherein, first port connector 10 comprises optical fiber collimator 11, beam splitting/combiner 12 and wave plate 13, second port connector 20 comprises optical fiber collimator 21, beam splitting/combiner 22 and wave plate 23, and beam splitting/combiner 12,22 can be made by birefringece crystal.10 inputs of a branch of optical signals first port connector, through after the optical processing of wave filter, become 20 outputs of the different optical signals of two bundle polarization states second port connector, second port connector 20 can adopt two single fiber collimating apparatuss or a two fine collimating apparatus, adopts a two fine collimating apparatus 21 in the present embodiment.
As shown in Figure 5, polarisation beam splitter 70 comprises 72,73 and parallel-plates 71 of two prisms, parallel-plate 71 is clipped between the two prisms, and two opposite face 74 is fitted with the inclined-plane of prism 72,73 respectively, applies polarisation beam division coating on this a pair of coating surface 74.Optical signals prism 73 goes into to inject feedback reflector device 80, this feedback reflector device 80 is made of a right-angle prism, return polarisation beam splitter 70 through the direction of turning back after twice total reflection in the light signal feedback reflector device 80, at polarisation beam division coating place, every bundle light signal is split into the perpendicular light beam of two bundle polarization states again, become the parallel light signal of four bundles behind the two-beam signal process polarisation beam splitter 70, this four bundles light signal returns second filter cell 60 and first filter cell 50 once more.From the light signal approaching side of first filter cell, 50 outgoing to light lead prism 40.
As shown in Figure 4, side direction light lead prism comprises a pair of first transmission plane 41 that is parallel to each other and second transmission plane 42, comprises that also the angle of a pair of first reflecting surface 43 that is parallel to each other and second reflecting surface, 44, the first reflectings surface 43 and first transmission plane 41 is 45 °.The light signal that comes from first filter cell enters from first transmission plane 41, on first reflecting surface 43, reflex to second reflecting surface 44, after 44 reflections of second reflecting surface, penetrate from second transmission plane 42, second transmission plane 42 is provided with phase compensation sheet 45, and phase compensation sheet 45 can be used for compensating the phase differential that each light beam produces at reflex time.
The second transmission plane optical junction of roof prism 30 and side direction light lead prism 40, the light signal parallel from four bundles of the second transmission plane outgoing becomes two groups of cross one another light signals (as shown in Figure 6) through behind the roof prism 30, and each group comprises the pair of parallel light signal again.These two groups of light signals enter second port connector 20 at last, and the pair of parallel light signal in beam splitting/combiner 22 in each group is reassembled into a branch of light signal (as shown in Figure 7) again, and by optical fiber collimator 21 outputs.
Like this, from a branch of wavelength optical signals that comprises of optical fiber collimator 11 input through after the filter process of the present invention, finally become two bundles and comprise wavelength optical signals, from two optical fiber outputs of optical fiber collimator 21, the wavelength interval of different wave length becomes the twice of input signal in every bundle light signal respectively.
Claims (9)
1. comb filter, comprise first port connector (10), second port connector (20), first filter cell (50), second filter cell (60), polarisation beam splitter (70) and feedback reflector device (80), it is characterized in that: between second port connector (20) and first filter cell (50), also be provided with a side direction light lead prism (40) and a roof prism (30), described side direction light lead prism (40) comprises a pair of first transmission plane (41) that is parallel to each other and second transmission plane (42), also comprise a pair of first reflecting surface (43) that is parallel to each other and second reflecting surface (44), described first transmission plane (41) and first filter cell (50) optical junction, second transmission plane (42) and roof prism (30) optical junction, roof prism (30) and second port connector (20) optical junction.
2. comb filter according to claim 1 is characterized in that: described first, second port connector (10,20) includes optical fiber collimator (11,21), beam splitting/combiner (12,22) and wave plate (13,23).
3. comb filter according to claim 2 is characterized in that: the quantity of described second port connector (20) is one, and optical fiber collimator wherein (21) is two fine collimating apparatuss.
4. comb filter according to claim 2 is characterized in that: described beam splitting/combiner (12,22) is made by birefringece crystal.
5. comb filter according to claim 1 is characterized in that: first reflecting surface (43) of described side direction light lead prism (40) is 45 ° with the angle of first transmission plane (41).
6. comb filter according to claim 1 is characterized in that: second transmission plane (42) of described side direction light lead prism (40) is provided with phase compensation sheet (45).
7. comb filter according to claim 1, it is characterized in that: be provided with half-wave plate (51) between described first filter cell (50) and second filter cell (60), also be provided with half-wave plate (61) between second filter cell (60) and the polarisation beam splitter (70).
8. comb filter according to claim 1 is characterized in that: described feedback reflector device (80) is a right-angle prism.
9. comb filter according to claim 8, it is characterized in that: described polarisation beam splitter (70) comprises two prisms (72,73) and be clipped in parallel-plate (71) between the two prisms, described parallel-plate (71) is gone up and is applied polarisation beam with the two prisms facing surfaces and divide coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100506385A CN101881863A (en) | 2009-05-05 | 2009-05-05 | Comb filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100506385A CN101881863A (en) | 2009-05-05 | 2009-05-05 | Comb filter |
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| Publication Number | Publication Date |
|---|---|
| CN101881863A true CN101881863A (en) | 2010-11-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100506385A Pending CN101881863A (en) | 2009-05-05 | 2009-05-05 | Comb filter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012122728A1 (en) * | 2011-03-17 | 2012-09-20 | 昂纳信息技术（深圳）有限公司 | A polarized light interference-type comb filter |
| CN102707451A (en) * | 2012-06-25 | 2012-10-03 | 珠海保税区光联通讯技术有限公司 | Polarization light splitting and merging device and method for producing same |
| CN109154700A (en) * | 2016-05-25 | 2019-01-04 | 瞻博网络公司 | Light coupling devices and method |
-
2009
- 2009-05-05 CN CN2009100506385A patent/CN101881863A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012122728A1 (en) * | 2011-03-17 | 2012-09-20 | 昂纳信息技术（深圳）有限公司 | A polarized light interference-type comb filter |
| CN102707451A (en) * | 2012-06-25 | 2012-10-03 | 珠海保税区光联通讯技术有限公司 | Polarization light splitting and merging device and method for producing same |
| CN109154700A (en) * | 2016-05-25 | 2019-01-04 | 瞻博网络公司 | Light coupling devices and method |
| CN109154700B (en) * | 2016-05-25 | 2022-06-03 | 瞻博网络公司 | Optical coupling apparatus and method |
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Application publication date: 20101110 |