CN1545238A - Eight-channel full fiber coarse wavelength-division multiplexer/demultiplexer - Google Patents
Eight-channel full fiber coarse wavelength-division multiplexer/demultiplexer Download PDFInfo
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- CN1545238A CN1545238A CNA2003101085507A CN200310108550A CN1545238A CN 1545238 A CN1545238 A CN 1545238A CN A2003101085507 A CNA2003101085507 A CN A2003101085507A CN 200310108550 A CN200310108550 A CN 200310108550A CN 1545238 A CN1545238 A CN 1545238A
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- wavelength division
- wavelength
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Abstract
The invention relates to 8-channel full-optical fiber coarse wavelength division multiplexer/ demultiplexer, adopting a wavelength division multiplexing unit made by fused biconic taper (FBT) technique as a basic unit, using cascade mode to synthesize seven wavelength division multiplexing units at different working wavelength into a 20nm-space 8-channel three-stage full-optical fiber coarse wavelength division demultiplexer, which has an input port and 8 output ports, the lights of two branched channels of each unit are periodically distributed and compensatory. Reverse the demultiplexer as a coarse wavelength division multiplexer with 8 reverse input ports and 1 output port. It is easy to construct and little influenced by environmental temperature and humidity, and has low cost, good working stability and very good expandability, and can increase communication capacity for the same network, meeting the demands of current communication service on bandwidth.
Description
Technical field:
The present invention relates to a kind of eight channel full-optical fiber Coarse Wavelength Division Multiplexing/demodulation multiplexers, is important passive device in a kind of optical fiber communication coarse wavelength division multiplexing systems, belongs to the photonic system field in the optical communication technique.
Background technology:
In recent years, the service traffics on the telecommunications network constantly increase, and require network that more and more wideer bandwidth can be provided.In order to satisfy the demand of communication service to bandwidth, many in the world countries adopt dense wave division multipurpose (DWDM) technology that the fibre circuit of having laid is carried out dilatation.Wide bandwidth, the transparency and these advantages of the successful Application in long-distance backbone network of transfer of data make close wavelength-division multiplex technology become desirable network transmission platform.Yet because it involves great expense, close wavelength-division multiplex technology only is applied to long-distance backbone network, the metropolitan area network and the Access Network that are used for just becoming at present the development focus that can't be very fast.In order to overcome these shortcomings, Coarse Wavelength Division Multiplexing (CWDM) technology has obtained commercial use.Coarse wavelength division multiplexing systems possesses many advantages such as low-power consumption, small size and low cost.These advantages make coarse wavelength division multiplexing systems have higher commercial practicality, will substitute close wavelength-division multiplex technology and be applied in metropolitan area network and the Access Network.In the optical communication network of high power capacity, channel selector spare plays an important role to channel multiplexing/demultiplexing.Difference between close wavelength-division multiplex technology and the Coarse Wavelength Division Multiplexing technology is the interval between optical wavelength.DWDM is multiplexing more optical channel in an optical fiber, but DWDM structure more complicated, expense is relatively expensive, so close wavelength-division multiplex technology is mainly used in wide area network, in the long distance line communications applications, and compound 160 channels in an optical fiber at most.Then multiplexing 4 to 16 channels of Coarse Wavelength Division Multiplexing technology are mainly used in local area network (LAN) and metropolitan area network, the channel spacing broad of CWDM, and the channel spacing of typical C WDM is 20nm.
Wavelength division multiplexer/demultiplexer has been widely used in the optical fiber telecommunications system, it merges to the light of different wave length in the optical fiber transmits, perhaps the light with a plurality of wavelength of transmitting in the optical fiber separately is transferred to different ports, has improved the bandwidth of optical fiber telecommunications system greatly.The technology of Coarse Wavelength Division Multiplexing/demodulation multiplexer employing mainly contains following several at present:
1. Coarse Wavelength Division Multiplexing/the demodulation multiplexer that forms by wide-band coupler and filter combination, it is to be combined by a N passage wide-band coupler and N narrow band filter, the centre wavelength difference of N narrow band filter, be serially connected in successively in N the branched bottom of wide-band coupler, the shortcoming of this wavelength division multiplexer is that the insertion loss is big, inserts loss and increases along with the increase of number of active lanes N.
2. adopt the Coarse Wavelength Division Multiplexing/demodulation multiplexer of holographic grating, combine by holographic grating and convergent lens.Incident light is divided into the different light of multi beam wavelength after projecting holographic grating, and has different angles, converge in the N root optical fiber by convergent lens respectively again, though the number of channel of this Wavelength division multiplexer/demultiplexer can be very big, and the insertion loss is little, and isolation is also higher, but its shortcoming is that it is to temperature sensitive, be subjected to environmental influence big, practicability still has certain difficulty.
3. adopt the Coarse Wavelength Division Multiplexing/demodulation multiplexer of multilayer dielectricity interference filter film, combine by N different narrow-band interference light filter film and N+1 optical fiber collimator of centre wavelength.Collimated light beam is through different narrow-band interference light filter films, and the centre wavelength difference of transmitted light is collected the back by N optical fiber collimator and transmitted in N channel.This device is bigger to the light difficulty, and coupling efficiency is low.
Summary of the invention:
The objective of the invention is at the deficiencies in the prior art, propose a kind of easy to implement, insert loss little, be subjected to eight little channel full-optical fiber Coarse Wavelength Division Multiplexing/demodulation multiplexers of environmental influence, can on same Internet resources, increase message capacity, satisfy the demand of present communication service bandwidth.
For realizing such purpose, the present invention adopts the wavelength division multiplexing unit of fused biconical taper fabrication techniques as elementary cell, utilize cascade system that the wavelength division multiplexing unit combination of seven different operating wavelength is become the eight channel three levels full optical fiber coarse wavelength division demultiplexer of channel spacing for 20nm, has an input port, eight output ports, the light of two branched bottoms of each unit is period profile and complementation on spectrum.Coarse wavelength division demultiplexer is reversed eight input ports, and an output port promptly can be used as Coarse Wave Division Multiplexer and uses.
Coarse wavelength division demultiplexer of the present invention is to have an input port, the full optical fibre device of eight output ports, and the fused biconical taper wavelength division multiplexing is unit cascaded forms by several, has three grades.Each wavelength division multiplexing unit of forming coarse wavelength division demultiplexer of the present invention all adopts the fused biconical taper fabrication techniques to form, the wavelength division multiplexing unit of each grade has different wavelength intervals, the wavelength interval is doubled and redoubled by cascaded stages, the channel spacing of the fused biconical taper wavelength division multiplexing unit of the first order is 20nm, the channel spacing of partial two fused biconical taper wavelength division multiplexing unit is 40nm, has different operation wavelengths respectively, be cascaded to two output branches of the wavelength division multiplexing unit of the first order according to the operation wavelength of correspondence, the channel spacing of four fused biconical taper wavelength division multiplexing unit of 3rd level then is 80nm, has different operation wavelengths respectively, be cascaded to each output branch of corresponding partial wavelength division multiplexing unit according to the operation wavelength of correspondence, the light of two branched bottoms of each unit is period profile on spectrum, and the wavelength in branched bottom is positioned at the cut-off wave section in another branched bottom, promptly the spectrum in two branched bottoms is complementary, final eight channels of realizing, channel spacing is the full optical fiber coarse wavelength division demultiplexer of 20nm.
Coarse wavelength division demultiplexer of the present invention is reverse, be about to its eight output ports as input port, an input port then can be used as Coarse Wave Division Multiplexer and uses as output port.
The present invention adopts fused biconical taper wavelength division multiplexing unit as elementary cell, Coarse Wavelength Division Multiplexing/demodulation multiplexer that cascade forms is an all optical fibre structure, easy to implement, come compared with the wavelength division multiplexer that adopts multilayer dielectricity interference filter film, cost is very cheap, and structure is very simple, is subjected to ambient temperature, humidity effect less, better working stability.The present invention has favorable expansibility, the wavelength division multiplexing communications that is used for simple optical fiber makes the capacity of simple optical fiber expand 10Gbit to by 2.5Gbit, even bigger, on same Internet resources, increase message capacity, satisfied the demand of present communication service bandwidth.The present invention can be used for the coarse wavelength division multiplexing systems of metropolitan area network and Access Network.
Description of drawings:
Fig. 1 is the structure principle chart of eight channel full-optical fiber coarse wavelength division demultiplexers of the present invention.
Among Fig. 1, the 1st, first order channel spacing is the fused biconical taper wavelength division multiplexer unit of 20nm, 2 and 3 is respectively the fused biconical taper wavelength division multiplexer unit that two channel spacings in the second level are 40nm, 4,5,6 and 7 is that four corresponding operation wavelengths of the third level, channel spacing are the fused biconical taper wavelength division multiplexer unit of 80nm.
Fig. 2 is the structure principle chart of eight channel full-optical fiber Coarse Wave Division Multiplexers of the present invention.
Fig. 3 is the transmission characteristic schematic diagram of C-band 8 channel Coarse Wave Division Multiplexers of the present invention.
Embodiment:
Below in conjunction with drawings and Examples technical scheme of the present invention is further described:
As shown in Figure 1, the full optical fiber coarse wavelength division demultiplexer of eight channels comprises seven fused biconical taper wavelength division multiplexing unit.Wherein Unit 1 is that first order channel spacing is the fused biconical taper wavelength division multiplexer unit of 20nm, particular job wavelength, Unit 2 and Unit 3 are respectively that two the corresponding operation wavelengths in the second level, channel spacing are the fused biconical taper wavelength division multiplexer unit of 40nm, 4, Unit 5,6 and 7 are that four corresponding operation wavelengths of the third level, channel spacing are the fused biconical taper wavelength division multiplexer unit of 80nm.2, the input of Unit 3 links to each other with two of Unit 1 output branches respectively, and 4,5,6 link to each other with four outputs correspondences of Unit 2,3 respectively with the input of Unit 7.The input of Unit 1 is the input of full optical fiber coarse wavelength division demultiplexer, 4,5,6 and eight outputs of Unit 7 be eight delivery channels of full optical fiber Coarse Wave Division Multiplexer.
Wavelength division multiplexing unit among Fig. 1 that the present invention adopts all is to adopt the fused biconical taper fabrication techniques.The manufacture craft of the specific embodiment of fused biconical taper and common fused tapered fiber coupler is roughly the same.When making device, by changing the fused biconical taper condition, strengthen the sensitiveness of coupling coefficient, thereby can make wavelength division multiplexer (WDM) wavelength, promptly close ripple/partial wave coupler.
After making whole fused biconical taper wavelength division multiplexers unit, seven fused biconical taper wavelength division multiplexer unit are cascaded up according to Fig. 1.Wideband light source (is forgiven λ
1～λ
8Scope) light is imported the input port of Coarse Wave Division Multiplexer of the present invention as incident light, is the light (λ that 1, eight wavelength interval, wavelength division multiplexing unit of 20nm, particular job wavelength is 20nm through channel spacing
1, λ
2, λ
3, λ
4, λ
5, λ
6, λ
7, λ
8) chosen by two branched bottoms of Unit 1, the light of two branched bottoms is period profile on spectrum, and the wavelength in branched bottom is positioned at the cut-off wave section in another branched bottom, promptly the spectrum in two branched bottoms is complementary, thereby the selection wavelength in the branched bottom of Unit 1 is λ
1, λ
3, λ
5, λ
7, then the selection wavelength in another branched bottom is λ
2, λ
4, λ
6, λ
8, the wavelength interval is 40nm; Respectively through two channel spacings wavelength division multiplexing unit 2 that is 40nm, corresponding operation wavelength and 3 selection, wavelength is divided into four groups of (λ that are spaced apart 80nm to light in two branched bottoms in Unit 1 again
1, λ
5), (λ
3, λ
7) and (λ
2, λ
6), (λ
4, λ
8) respectively by two branched bottoms outputs of two branched bottoms and Unit 3 of Unit 2; Then to import four channel spacings respectively be 80nm to the light of these four groups of wavelength, the wavelength division multiplexing unit 4,5,6,7 of corresponding operation wavelength, partial wave effect through these four wavelength division multiplexing unit, by eight output port outputs of coarse wavelength division demultiplexer, corresponding output wavelength is respectively λ to the light of eight wavelength respectively
1, λ
5, λ
3, λ
7, λ
2, λ
6, λ
4, λ
8
If above-mentioned coarse wavelength division demultiplexer is reverse, promptly become Coarse Wave Division Multiplexer, as shown in Figure 2.With λ
1, λ
5, λ
3, λ
7, λ
2, λ
6, λ
4, λ
8By eight port inputs of Coarse Wave Division Multiplexer, the ripple effect of closing of process Coarse Wave Division Multiplexer is with λ respectively for the light of eight wavelength
1～λ
8The light of eight wavelength is together by an optical fiber output.Fig. 3 has provided the channel transfer characteristic schematic diagram of the full optical fibre device of this cascade, wherein λ
1～λ
8Be the operation wavelength of eight channels, Δ λ is the wavelength interval of channel, is 20nm, and δ λ is a channel width.
Claims (2)
1, a kind of eight channel full-optical fiber coarse wavelength division demultiplexers, it is characterized in that adopting the wavelength division multiplexing unit of fused biconical taper fabrication techniques as elementary cell, utilize cascade system the wavelength division multiplexing unit combination of seven different operating wavelength to be become three grades of full optical fiber coarse wavelength division demultiplexers of eight channels, has an input port, eight output ports, the light of two branched bottoms of each unit is period profile and complementation on spectrum, the channel spacing of the fused biconical taper wavelength division multiplexing unit of the first order is 20nm, the channel spacing of partial two fused biconical taper wavelength division multiplexing unit is 40nm, be cascaded to two output branches of the wavelength division multiplexing unit of the first order according to the operation wavelength of correspondence, the channel spacing of four fused biconical taper wavelength division multiplexing unit of the third level is 80nm, is cascaded to each output branch of corresponding partial wavelength division multiplexing unit according to the operation wavelength of correspondence.
2, a kind of eight channel full-optical fiber Coarse Wave Division Multiplexers is characterized in that the coarse wavelength division demultiplexer of claim 1 is oppositely formed, and are about to its eight output ports as input port, and an input port is as output port.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2003101085507A CN1545238A (en) | 2003-11-13 | 2003-11-13 | Eight-channel full fiber coarse wavelength-division multiplexer/demultiplexer |
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|---|---|---|---|
| CNA2003101085507A CN1545238A (en) | 2003-11-13 | 2003-11-13 | Eight-channel full fiber coarse wavelength-division multiplexer/demultiplexer |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100403078C (en) * | 2006-06-23 | 2008-07-16 | 华为技术有限公司 | Optical add-drop multiplexer, system thereof, and updating extension method therefor |
| CN101350662B (en) * | 2008-09-01 | 2010-06-23 | 成都优博创技术有限公司 | Cascade connection networking method based on xWDM wavelength-division multiplex RF far-drawing unit |
| CN101521613B (en) * | 2008-12-31 | 2011-12-14 | 张建国 | Method for designing optical fiber communication network structure, and extensible network structure |
| CN110308522A (en) * | 2019-07-09 | 2019-10-08 | 中山市标致电子科技有限公司 | A kind of coarse wavelength division multiplexer device |
| CN112834072A (en) * | 2021-02-08 | 2021-05-25 | 广东海洋大学 | Michelson interference optical fiber temperature sensor for detecting stripe contrast change |
| CN115308845A (en) * | 2021-05-08 | 2022-11-08 | 中国移动通信集团浙江有限公司 | Wavelength division multiplexer and communication equipment |
-
2003
- 2003-11-13 CN CNA2003101085507A patent/CN1545238A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100403078C (en) * | 2006-06-23 | 2008-07-16 | 华为技术有限公司 | Optical add-drop multiplexer, system thereof, and updating extension method therefor |
| CN101350662B (en) * | 2008-09-01 | 2010-06-23 | 成都优博创技术有限公司 | Cascade connection networking method based on xWDM wavelength-division multiplex RF far-drawing unit |
| CN101521613B (en) * | 2008-12-31 | 2011-12-14 | 张建国 | Method for designing optical fiber communication network structure, and extensible network structure |
| CN110308522A (en) * | 2019-07-09 | 2019-10-08 | 中山市标致电子科技有限公司 | A kind of coarse wavelength division multiplexer device |
| CN112834072A (en) * | 2021-02-08 | 2021-05-25 | 广东海洋大学 | Michelson interference optical fiber temperature sensor for detecting stripe contrast change |
| CN112834072B (en) * | 2021-02-08 | 2021-09-24 | 广东海洋大学 | Michelson interference optical fiber temperature sensor for detecting stripe contrast change |
| CN115308845A (en) * | 2021-05-08 | 2022-11-08 | 中国移动通信集团浙江有限公司 | Wavelength division multiplexer and communication equipment |
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