CN1259810A - Unit type expandable optical wave division and composite use parts - Google Patents
Unit type expandable optical wave division and composite use parts Download PDFInfo
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- CN1259810A CN1259810A CN 99124947 CN99124947A CN1259810A CN 1259810 A CN1259810 A CN 1259810A CN 99124947 CN99124947 CN 99124947 CN 99124947 A CN99124947 A CN 99124947A CN 1259810 A CN1259810 A CN 1259810A
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- optical fiber
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Abstract
The basic unit is double fibre-optical contact pin connected with coupling lens, then the band-pass filtering plate, coupling lens and double fibre-optical contact pin are connected in proper order by optical path to be a component with four parts. When N basic units are cascale connected, the first and N units remain a optical bibre each as input and output terminals for signal. The two optical fibres of second double fibre-optical contact pin of each basic unit are used as load and unload terminals of signal with set wave length. The invention is suitable for optical indensive wave multiplexing system to load and unload signals with different wave length. It can be used to form multiplexer and demultiplexer, realize the function of connecting optical path by switch and light in cross and optical delay.
Description
The present invention relates to the passive device used in a kind of optical fiber telecommunications system, be used for downloading the specified wavelength light signal, constitute new multi-wavelength transmission signals among perhaps the specified wavelength light signal being uploaded to the DWDM fibre circuit from the multi-wavelength transmission signals of dense wave division multipurpose (DWDM) fibre circuit.
Have three low loss window at 820nm～160nm optical wavelength range optical fiber, can hold the transinformation of 180000Gbit/s, this means with an optical fiber and just can transmit 180 No. hundred million phones (every road phone 10kbit/s).But the optical fiber telecommunications system that adopts the single wavelength transmission at present only reaches the transmission rate (can only transmit 100 No. ten thousand phones or 1000 road TVs) of 10Gbit/s, so optical fiber communication has extremely huge dilatation potentiality.Dense wave division multipurpose (DWDM) is exactly one of the most effective optical fiber communication dilatation technology.It utilizes a fibre circuit to transmit tens or the different light wavelength channel of dozens of simultaneously, makes message capacity enlarge tens times even hundred times, to adapt to the sharp increase of human society for the quantity of information requirement.Be that the optical-fiber network of basic fundamental need utilize a kind of equipment to carry out the download of specified wavelength light signal or uploads with DWDM, this equipment is exactly optical add/drop multiplexer (OADM).
The OADM related art scheme that has proposed comprises U.S. Patent No. 5999290, No.5959749 and U.S. Patent No. 5479082.Wherein, No.5999290 is connected in series a demodulation multiplexer with another multiplexer, and both the logical optical filtering centre wavelength of band is staggered slightly, to increase the optical filtering pass band width; No.5959749 adopts a demodulation multiplexer and a multiplexer, and between inserts optical switch, optical attenuation, optical modulation device, to realize corresponding function; No.5479082 adopts two circulators, and between insertion tunable bandpass filters, realizes the Optical Add Drop Multiplexer function with this.Demodulation multiplexer, multiplexer and circulator all are made of a lot of optics usually, constitute the optical add-drop multiplexer architecture complexity, cost an arm and a leg with them, are not easy to popularize use.
One of the object of the invention is by designing a kind of unit type expandable optical wave division and composite use parts, make it to have concurrently single wavelength light add drop multiplex, multi-wavelength light add drop multiplex and dense wave division multipurpose function, simplify the OADM device architecture, the demultiplexing and the multiplexing function of device are united two into one, thereby reduce device cost significantly; Two of the object of the invention is to constitute a kind of structure of being convenient to wavelength tuning, obtains a kind of single wavelength and multi-wavelength tuning device of carrying out.
Realize the unit type expandable optical wave division and composite use parts of the object of the invention, contain the logical filter element of band, it is characterized in that:
(1) elementary cell is made up of two optical fiber contact pins, coupled lens and bandpass filter, its position is in regular turn: the bandpass filter on the first pair of optical fiber contact pins, first coupled lens joining with it, the light path, second coupled lens and second pair optical fiber contact pins joining with it, constitute one four port devices
(2) N is individual constitutes N wavelength light add-drop multiplexer side by side as (1) described elementary cell, N 〉=1, and the bandpass filter of N elementary cell has N different centre wavelength respectively; When N＞1, the optical fiber of first pair of optical fiber contact pins of each elementary cell and neighboring unit cells cascade welding successively, an optical fiber that only stays first pair of optical fiber contact pins of first elementary cell as an optical fiber of light signal input, first pair of optical fiber contact pins of a N elementary cell as light signal output end, two optical fiber of second pair of optical fiber contact pins of each elementary cell respectively as the download end of specified wavelength signal with upload end.
Said units formula expandable optical wave division and composite use parts, its further feature can be in the described elementary cell, two optical fiber of first pair of optical fiber contact pins place with respect to the symmetrical of first coupled lens and mutually closely close, optical fiber head be positioned on the focal plane of first coupled lens, two optical fiber of second pair of optical fiber contact pins place with respect to the symmetrical of second coupled lens and mutually closely close, optical fiber head be positioned on the focal plane of second coupled lens.
Said units formula expandable optical wave division and composite use parts, described bandpass filter can be the tunable wavelength filter, has constituted corresponding tunable wave length device.
Said units formula expandable optical wave division and composite use parts, can be used as multiplexer or demodulation multiplexer in the light dense wavelength division multiplexing system, the input of multiplexer is that the output of load port on each signal of described unit type expandable optical wave division and composite use parts, multiplexer is the light signal output end mouth of described unit type expandable optical wave division and composite use parts; The input of demodulation multiplexer is that the light signal input port of described unit type expandable optical wave division and composite use parts, the output of demodulation multiplexer are each signal download port of described unit type expandable optical wave division and composite use parts.
The unit type expandable optical wave division and composite use parts of N wavelength, its download/upload wavelength can be the adjacent channel wavelength, also can be non-adjacent channel wavelength, or the different transmission wavelengths of optical fiber.
The unit type expandable optical wave division and composite use parts download port of N wavelength is connected with output port with the input of corresponding light signal processing array respectively with last load port, constitute the related device of dwdm system, as optical routing switch matrix, optical cross-connect matrix, optical delay line matrix or the like.
Unit type expandable optical wave division and composite use parts of the present invention, adopt two optical fiber and collimation-condenser lens coupling, utilize the confocal symmetrical coupled principle of light, and by bandpass filter selection download (uploading) wavelength, make straight-through wavelength light signal reflex coupling, and download (uploading) wavelength light signal transmission coupling, realize the Optical Add Drop Multiplexer function; With the OADM elementary cell cascade of different wave length, expand formation multi-wavelength OADM device.This device unites two into one DWDM demodulation multiplexer and multiplexer, simple in structure, cheap, cooperate with related device and can realize optical cross connect (OXC), optical routing switch matrix, the multiple function of optical delay line matrix, be particularly useful for the dense wave division multipurpose optical fiber telecommunications system.
Figure one is basic cell structure figure of the present invention
Figure two is a dual wavelength OADM structure chart
Figure three is a N wavelength OADM structure chart
Figure four is used for the optical cross connect example for device of the present invention
Figure five is used for multichannel light time-delay example for device of the present invention
Figure one illustrates basic cell structure of the present invention, comprises two two optical fiber contact pins (13,17), two coupled lens (14,16) and bandpass filters (15); First pair of optical fiber contact pins (13) and first coupled lens (14) link, and light path connector strip pass filter (15), second coupled lens (16) and second pair of optical fiber contact pins (17) successively constitute one four port devices then; Two optical fiber (11,12) of first pair of optical fiber contact pins are placed with respect to the symmetrical of lens 14 and are closely close mutually, optical fiber head is positioned on the focal plane of lens 14, two optical fiber (18,19) of second pair of optical fiber contact pins are placed with respect to the symmetrical of lens 16 and are closely close mutually, and optical fiber head is positioned on the focal plane of lens 16; Optical fiber 11 connects DWDM fibre circuit input, by the DWDM multi-wavelength (λ of optical fiber 11 inputs
1～λ
m) light wave becomes the parallel light wave of a low-angle (＜2 °) outgoing after lens 14, in this parallel light wave with bandpass filter 15 central wavelength lambda
1Different wavelength signals (straight-through light) is subjected to reflection and again through lens 14 coupled into optical fibres 12, optical fiber 12 connects DWDM fibre circuit output; In this parallel light wave with bandpass filter 15 central wavelength lambda
1Identical wavelength signals (download light) low-loss is by filter 15 and through lens 16 coupled into optical fibres 19, and optical fiber 19 is specified wavelength λ
1The signal download port; Optical fiber 18 is meant decides wavelength X
1Load port on the signal, the light wave of being imported by optical fiber 18 becomes the parallel light wave of a low-angle (＜2 °) outgoing after lens 16, and low-loss is inserted DWDM optical fiber outlet line by filter 15 and through lens 16 coupled into optical fibres 12 then.Finished OADM specified wavelength λ thus
1The download of light signal and upload function.
Figure two illustrates dual wavelength OADM device architecture, and it comprises four two optical fiber contact pins (13,17,23,27), the different centre wavelength (λ with two of four coupled lens (14,16,24,26) by two unit cascaded forming of the OADM shown in figure one
1, λ
2) bandpass filter (15,25); The inner separately connected mode in two unit is identical with structure shown in the figure one, and the cascade between the unit is the optical fiber 12 and optical fiber 21 weldings with two unit, and then optical fiber 11 connects DWDM fibre circuit inputs, optical fiber 22 connection DWDM fibre circuit outputs; And optical fiber 18 is specified wavelength λ
1Load port on the signal; Optical fiber 19 is specified wavelength λ
1The signal download port; Optical fiber 28 is specified wavelength λ
2Load port on the signal; Optical fiber 29 is specified wavelength λ
2The signal download port.
Figure three illustrates N wavelength OADM device architecture, and it comprises 2N two optical fiber contact pins (13,17 by N unit cascaded the forming of OADM shown in figure one ... N3, N7), a 2N coupled lens (14,16 ... N4, N7) with N different centre wavelength (λ
1～λ
N) bandpass filter (15 ... N5); The inner separately connected mode in N unit is identical with structure shown in the figure one, and the cascade between the unit is according to the fused fiber splice of method shown in the figure two with two adjacent unit, then optical fiber 11 connection DWDM multi-wavelength (λ
1～λ
m) the fibre circuit input, optical fiber N2 connects DWDM fibre circuit output; And the optical fiber j8 of each unit (j=1,2 ... N) be this unit specified wavelength λ
jLoad port on the signal; Optical fiber j9 is this unit specified wavelength λ
jThe signal download port.
Figure four illustrates 2 wavelength, 2 * 2 optical cross-connects that are made of two OADM devices (1,2) and an optical cross connect switch matrix 3.Two ways of optical signals by the circuit input contains λ respectively
11, λ
12And λ
21, λ
22Process OADM device (1,2) is afterwards from download port output wavelength demultiplexed signal, and deliver to the input port of optical cross connect switch matrix 3, carry out after the optical cross connect processing, its output signal is sent to the corresponding insertion port of OADM device (1,2) again, and then the wavelength of optical signal from the output of line output mouth just is transformed to λ
11, λ
12And λ
21, λ
22, so just realized the optical cross connect function.
Figure five illustrates by tunable wavelength OADM device 4 and the tunable optical delayer with different fixing delayer (5,6,7,8) formation.By the light signal of line input mouth input, will be according to the tuning situation of the bandpass filter of OADM and from the download port output consistent with wavelength of optical signal, then through after the corresponding optical time delay unit again from inserting the line output mouth output of port through OADM; Because the amount of delay of the optical time delay unit that each port connects is provided with difference (for example being respectively 1,2,3,4 delay time unit), therefore just can selects needed light time-delay, thereby realize the time-delay controlled function by the centre wavelength of tuning OADM filter.
Claims (4)
1. a unit type expandable optical wave division and composite use parts contains the logical filter element of band, it is characterized in that:
(1) elementary cell is made up of two optical fiber contact pins, coupled lens and bandpass filter, its position is in regular turn: the bandpass filter on the first pair of optical fiber contact pins, first coupled lens joining with it, the light path, second coupled lens and second pair optical fiber contact pins joining with it, constitute one four port devices
(2) N is individual constitutes N wavelength light add-drop multiplexer side by side as (1) described elementary cell, N 〉=1, the bandpass filter of N elementary cell has N different centre wavelength respectively, when N＞1, the optical fiber of first pair of optical fiber contact pins of each elementary cell and neighboring unit cells cascade welding successively, an optical fiber that only stays first pair of optical fiber contact pins of first elementary cell is as the light signal input, an optical fiber of first pair of optical fiber contact pins of N elementary cell is as light signal output end, two optical fiber of second pair of optical fiber contact pins of each elementary cell respectively as the download end of specified wavelength signal with upload end.
2. unit type expandable optical wave division and composite use parts as claimed in claim 1, it is characterized in that in the described elementary cell, two optical fiber of first pair of optical fiber contact pins place with respect to the symmetrical of first coupled lens and mutually closely close, optical fiber head be positioned on the focal plane of first coupled lens, two optical fiber of second pair of optical fiber contact pins place with respect to the symmetrical of second coupled lens and mutually closely close, optical fiber head be positioned on the focal plane of second coupled lens.
3. unit type expandable optical wave division and composite use parts as claimed in claim 1 or 2 is characterized in that described bandpass filter is the tunable wavelength filter.
4. unit type expandable optical wave division and composite use parts as claimed in claim 1 or 2 is characterized in that it can be used as multiplexer or demodulation multiplexer in the light dense wavelength division multiplexing system; The input of multiplexer is that the output of load port on each signal of described unit type expandable optical wave division and composite use parts, multiplexer is the light signal output end mouth of described unit type expandable optical wave division and composite use parts; The input of demodulation multiplexer is that the light signal input port of described unit type expandable optical wave division and composite use parts, the output of demodulation multiplexer are each signal download port of described unit type expandable optical wave division and composite use parts.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99124947 CN1259810A (en) | 1999-12-29 | 1999-12-29 | Unit type expandable optical wave division and composite use parts |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99124947 CN1259810A (en) | 1999-12-29 | 1999-12-29 | Unit type expandable optical wave division and composite use parts |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100395969C (en) * | 2002-09-03 | 2008-06-18 | 鸿富锦精密工业（深圳）有限公司 | Optical add and drop multiplexer (OADM) |
| CN100459477C (en) * | 2001-05-25 | 2009-02-04 | 北京邮电大学 | Optical add and drop multiplexer supporting port-wavelength designation |
| CN102621642A (en) * | 2011-02-01 | 2012-08-01 | 深圳新飞通光电子技术有限公司 | Optical transceiver for wavelength division multiplexing |
-
1999
- 1999-12-29 CN CN 99124947 patent/CN1259810A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100459477C (en) * | 2001-05-25 | 2009-02-04 | 北京邮电大学 | Optical add and drop multiplexer supporting port-wavelength designation |
| CN100395969C (en) * | 2002-09-03 | 2008-06-18 | 鸿富锦精密工业（深圳）有限公司 | Optical add and drop multiplexer (OADM) |
| CN102621642A (en) * | 2011-02-01 | 2012-08-01 | 深圳新飞通光电子技术有限公司 | Optical transceiver for wavelength division multiplexing |
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