CN1377154A - Multi-wavelength optical albel transceiver based on wavelength-time encode method - Google Patents
Multi-wavelength optical albel transceiver based on wavelength-time encode method Download PDFInfo
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Abstract
The invention relates to a transceiver that uses multiple wavelengths light marks and is based on an encoding method of wavelengths-time. The spaces with two degrees of freedom i.e. time and wavelengths are utilzies in the encoding method. At the same slice of time, one or multiple difference wavelengths can appear, at different times, same wavelength combinations can appear. W pieces of wavelengths and K pieces of pulses can generates (2w-1)k codes with different light marks. Bandpass filters relevant to different wavelengths and relevant control logic set are utilized in the transceiver based on the invented method so as to increase the mark combinations formed greatly and improve coding efficiency effectively. Since the tunable bandpass filters are used in the transceiver, it makes possible for coder allocate the mark wavelengths dynamically so that replacing filters is not needed.
Description
Technical field:
The present invention relates to a kind of multi-wavelength light mark transceiver, belong to optical communication based on wavelength-time encoding method
Technical field.
Background technology
In recent years, rapid growth along with data service, requirement to the network bandwidth has proposed challenge, appearing at of dense wave division multipurpose (DWDM) technology solved this difficult problem to a certain extent, but, owing to be subjected to the limitation of light/electricity (electricity/light) disposal ability of existing network node, the purpose that makes full use of bandwidth also is restricted, that is to say, the data-handling capacity of node has become further expansion bandwidth " neck bottle ", and in order to address this problem, people have proposed many methods that overcome, the light packet switching is exactly wherein a kind of, it combines light switching technology and packet-switch technology together, thoroughly eliminates this bottleneck of light/electricity, thereby, occupying critical role in all optical network, also is simultaneously a new and high technology that realizes the wide-band-message network.In the light packet switching, broken into one by one " grouping " (packet) from the data on upper strata in adaptation layer, this packet data package mainly is made of a packet header (Header) and a load (Payload), packet header accounts for the sub-fraction of whole group, mainly comprise some address informations, load accounts for the overwhelming majority of packet data package, mainly contain the data that are transmitted, grouping from adaptation layer is delivered to switching node by optical transport layer, at the switching node place, node structure is only handled the packet header of grouping, content according to packet header is judged the destination, select route, the packet that arrives destination node (fringe node) will be reduced into original data format again in adaptation layer, and whole process has just been finished " transparent " exchange of data.According to the design in packet header, can be divided into negative carrier labelling method, multi-wavelength mark method etc.The multi-wavelength light labelling method is to utilize the combination of the light pulse of several different wave lengths to represent signal, reach the purpose of the different addresses of mark with this, this method can be divided into two kinds again, a kind of is to allow load data and mark header use the different wave length of different wave length channel to encode respectively, and another kind is to allow load data and mark header use the method for different wavelength channel transmission respectively.The latter compares with the person, has taken more wavelength resource, and the former is owing to be in same wavelength channel, effectively the wavelength resource of saves valuable.
People such as Naoya Wada provide a kind of multi-wavelength mark coding transceiver based on same wavelength channel in the Photonic of ECOC 2000 Packet Routing Based onMulti-Wavelength Label Switching Using Fiber Bragg Gratings one literary composition, to use W different wave length, the situation of K light pulse coding is an example, the coding basic principle of the encoder of this transceiver is: any one light pulse of K light pulse can be selected any one in W the different wave length for use, but the optical wavelength difference that light pulse is used each other, this coding method can generate W! / (W-K)! Individual different signal.
At above-mentioned coding, the design of Photonic Packet Routing Based on Multi-Wavelength LabelSwitching Using Fiber Bragg Gratings one literary composition transmitter mainly form by SC light source, 1 * 2 splitter, band pass filter, intensity modulator, Fiber Bragg Grating FBG and fibre delay line.Receiver has 1 * 2 splitter, low pass filter, Fiber Bragg Grating FBG, photo-detector, expander, gate, gain clamper RF driver and fibre delay line to form.The course of work of transmitter: the light signal from light source is sent into 1 * 2 splitter by optical fiber, 1 * 2 splitter is divided into 2 the tunnel with light signal, one the tunnel through after the intensity modulator modulation, send into Fiber Bragg Grating FBG, Fiber Bragg Grating FBG will make the output light signal become the series connection marker light pulse of a plurality of wavelength, simultaneously, the specific wavelength light signal that leaches by band pass filter from another road light signal of light source, send into intensity modulator, synthesize complete optical packet signal at splitter behind the delayed line of load light signal after the intensity modulated with from the marker light pulse of Fiber Bragg Grating FBG.The course of work of receiver: the optical packet signal from optical fiber is divided into two-way by splitter, lead up to band pass filter, leach the load light signal, another road is sent into a splitter again and is divided into three the tunnel, Fiber Bragg Grating FBG is passed through on each road respectively, after the light signal that the output of the Fiber Bragg Grating FBG of different parameters is different, these light signals are detected by photo-detector, send into the RF driver through low pass filter filtering and T-E, by each RF driver drives optical switch matrix.
The encoder of this transceiver is using W wavelength, under the situation of K light pulse, can produce W! / (W-K)! Individual different signal, based on the transceiver of this encoder, following weak point is arranged: code efficiency is low; Very flexible; Cost is expensive.
Summary of the invention:
The objective of the invention is at the deficiencies in the prior art, a kind of new multi-wavelength light label coding method is proposed and based on the multi-wavelength light mark transceiver of new compiling method, this signal optical transceiver is employed one's time to the best advantage and two kinds of degrees of freedom of wavelength, can improve code efficiency greatly, satisfy the requirement of different occasions, reduce cost, reach and utilize Limited resources to finish the more purpose of multiplex's work.
For realizing such purpose, the present invention has designed a kind of novel wavelength-time multi-wavelength light label coding method, and has designed multi-wavelength light mark optical transceiver based on the optical mark encoding method.Multi-wavelength light label coding method is characterised in that has fully used wavelength and time two degree of freedom spaces, to use W different wave length, the situation of K light pulse coding is an example, follow following rule when encoding: 1) can have different wavelength to occur in the sheet at the same time, can be that a wavelength also can be a plurality of wavelength; 2) in the different timeslice identical wavelength combinations can appear.The different cursors that this compiling method generates are designated as (2
W-1)
K, much larger than W! / (W-K)!
Transmitter based on this new compiling method mainly is made up of Supercontinum (SC) light source, 1 * N splitter, isolator, variable band-pass filter, intensity modulator, wavelength division multiplexer, load circuit and logic control circuit.Light signal from light source is sent into 1 * N splitter by optical fiber, 1 * N splitter is divided into N road light signal with light signal, by sending into variable band-pass filter behind the isolator separately respectively, variable band-pass filter is used up fibre with the specific wavelength light signal that leaches and is sent into intensity modulator, intensity modulator is connecting logic control circuit, the signal of telecommunication that logic control circuit produces outputs to intensity modulator respectively, light signal from variable band-pass filter is modulated respectively by intensity modulator, export the light signal of specific wavelength and pulse separately, intensity modulator is connecting the charged road of load, light signal from variable band-pass filter is modulated by the signal on the charged road of load, the load light signal of output specific wavelength all enters the synthetic light packet data package of wavelength division multiplexer at last.The receiver of design mainly comprises: 1 * N splitter, variable band-pass filter, light/electric transducer, serial/parallel transducer, synchronous circuit, judgement control circuit and optical switch matrix.Enter 1 * N splitter from the light signal of optical fiber and be divided into N road light signal, by sending into variable band-pass filter and synchronizer behind the isolator separately respectively, variable band-pass filter is sent into light/electric transducer with the specific wavelength mark light signal that leaches with optical fiber and is changed the signal of telecommunication into, the signal of telecommunication is sent into the serial/parallel device of back respectively, serial/parallel device is converted to electric pulse in parallel with the electric pulse of connecting and sends into the judgement control circuit, the judgement control circuit is judged routing iinformation according to the combination of electric pulse, generate the control signal of optical switch matrix then, the load light signal of optical switch matrix motor synchronizing in the future device is delivered to corresponding ports thus.
Optical mark encoding of the present invention can utilize less wavelength to realize the upgrading of the network address, can realize the dilatation of network in actual applications with less cost.The band pass filter and the corresponding control logic device of corresponding different wave length have been used in the transmitter based on this optical mark encoding conceptual design, thereby the condition that makes encoder can be implemented in to have one or more different wavelength to occur in the sheet at the same time, make the marker combination that can form increase greatly, effectively improve code efficiency.The present invention has used tunable band pass filter in receiver, thereby make that encoder can dynamic-configuration mark wavelength, need not change whole filter, not only increase the flexibility of receiver but also can save cost, reach and utilize Limited resources to finish the more purpose of multiplex's work.
Description of drawings and embodiment:
In order to understand technical scheme of the present invention better, execution mode is further described below in conjunction with accompanying drawing.
The multi-wavelength mark coding principle schematic diagram that Fig. 1 proposes for the present invention
The number of combinations of transverse axis N expressive notation among Fig. 1, longitudinal axis t represents the different time, the timeslice that the lattice representative is different, the circle of different colours is represented the pulse of different wave length, and two combinations in the dotted line are existing coding results.
For the purpose of simple declaration, Fig. 1 is with 2 wavelength, 2 pulses be encoded to example.Among the figure, transverse axis is represented the reference numerals that can make up, longitudinal axis express time, with the different wavelength of different color showings, different grids is represented different timeslices, because wavelength and time two degrees of freedom are arranged, as long as follow following rule when encoding: 1) can have different wavelength to occur in the sheet at the same time, can be that a wavelength also can be two wavelength; 2) in the different timeslice identical wavelength combinations can appear.Like this, just obtained 9 kinds of marks shown in Figure 1, this encoding scheme has had more 7 kinds of marks than existing coded system.
Be generalized to W wavelength, the situation of K pulse can obtain (2
W-1)
KKind, if get W=K=6, just can form 63523502209 different signals, and the address of Ipv4 ability 4294967296, exceeded an order of magnitude, if use 12 wavelength with old compiling method, 12 pulses just obtain 479001600 signals, satisfy the address need of Ipv4 and then must use at least 13 wavelength.This shows, adopted the compiling method of the present invention wavelength resource of saves valuable effectively.
In order to realize above-mentioned multi-wavelength encoded scheme, the design of transmitter has just been proposed new requirement, for this reason, designed the optical sender that is suitable for this multi-wavelength encoded scheme below.With two wavelength, two pulses are the example simple declaration.
Fig. 2 realizes the transmitter architecture figure of multi-wavelength mark coding for the present invention.
Transmitter is mainly by Supercontinum (SC) light source (1), optical isolator (3), 1 * 2 splitter (2), variable band-pass filter (4,5,6), intensity modulator (7,8,9), wavelength division multiplexer (13), load circuit (10), adjustable optic fibre delay line TFDL (11) and logic control circuit (12) are formed.Light source (1) connects 3 optical isolators (3) by 1 * 2 splitter (2), optical isolator (3) connects 3 variable band-pass filters (4 respectively, 5,6), variable band-pass filter (4,5,6) connecting 3 intensity modulators (7,8,9) again respectively, intensity modulator (7,8) be directly connected on the wavelength division multiplexer (13), intensity modulator (9) is connected with load circuit (10), is connected to wavelength division multiplexer (13) by adjustable optic fibre delay line TFDL (11) simultaneously, logic control circuit (12) is bonding strength modulator (7,8) respectively.
Supercontinum (SC) light source is the light source that a kind of bandwidth reaches 200nm, is divided into 3 light signals from the light signal of SC light source by 1 * 3 splitter (2), and 3 light signals are extracted 2 wavelength X by 2 band pass filters (4,5) respectively
i(i=1,2), these λ
i(i=1,2) are used for as different signal wavelength, and band pass filter (6) extracts the wavelength band that load signal is used, and these mark wavelength series and the wavelength band that is used for load signal are all in the same WDM communication channel of I-TUT regulation.Generate the control signal of finishing in advance by logic control circuit (12), modulator (7,8) generate the light pulse of needs according to these control signals, simultaneously, load signal by load generator (10) output is admitted to modulator (9), modulates the load light signal, through the adjusting of adjustable optic fibre delay line (11), synthesized a complete optical packet signal with the signal of modulator (7,8) output by wavelength division multiplexer (13).
Fig. 3 is the principle key diagram of logic control circuit among Fig. 2 (12).
As shown in the figure, transverse axis t express time, longitudinal axis S
7Expression is added in the signal on the modulator 7, longitudinal axis S
8Expression is added in the signal on the modulator 8.As generating the 5th, the 6th in Fig. 1 marker combination, the 9th kind of mark, logic control circuit (12) should produce (a) and (b), (c) 3 kinds of different logic control signals respectively.
Fig. 4 is for realizing the receiver structure figure of multi-wavelength mark decoding.
Receiver is mainly by 1 * 2 splitter (14), tunable bandpass filters (16,17,18), light/electric transducer (19,20), serial/parallel transducer (21,22), synchronizer (23), judgement control circuit (24) and optical switch matrix compositions such as (25).1 * 2 splitter (14) connects 3 variable band-pass filters (16,17,18) respectively by 3 optical isolators (15), variable band-pass filter (16), (17) connect light/electric transducer (19 respectively, 20), light/electric transducer (19,20) be connected to judgement control circuit (24) by serial/parallel transducer (21,22) respectively, variable band-pass filter (18) connects synchronizer (23), and optical switch matrix (25) is connected with judgement control circuit (24) with synchronizer (23) simultaneously.
Light grouped data from optical transport layer is divided into 3 light signals by 1 * 3 splitter (14), and wherein 2 light signals are extracted 2 wavelength X by 2 variable band-pass filters (16,17) respectively
i(i=1,2), the light signal quilt light/electric module (19 thereafter of these wavelength, 20) be converted to electric impulse signal in parallel respectively, send into judgement control circuit (24), judgement control circuit (24) is judged routing address according to the combination of all electric impulse signals, control optical switch matrix (25) then, meanwhile, logical humorous filtering (18) leaches the load light signal to the 3rd light signal of being told by 1 * 3 splitter (14) through adjustable band, pass through the delay of synchronizer (23) again and coordinate to send into optical switch matrix (24), the route signal that provides at optical switch matrix (24) internal condition judgement control circuit is distributed to each port with the load light signal.
Fig. 5 is the principle key diagram of adjudicating control circuit (24) among Fig. 4.
As shown in the figure, judgement control circuit (24) is (a) and (b), (c) as the logical signal that obtains, and mark that then can the interpretation correspondence is the 5th, the 6th, the 9th kind of mark.
Claims (5)
1, a kind of wavelength-time multi-wavelength light label coding method is characterized in that two degree of freedom spaces of service time and wavelength, and coding is followed following rule: 1) can have one or more different wavelength to occur in the sheet at the same time; 2) in the different timeslice identical wavelength combinations can appear; Thus at W wavelength, under the situation of K pulse, the generation (2 of can encoding
W-1)
KPlant different signals.
2, the multi-wavelength light mark transmitter of a kind of wavelength-time encoding method based on claim 1, it is characterized in that mainly by SC light source (1), optical isolator (3), splitter (2), variable band-pass filter (4,5,6), intensity modulator (7,8,9), wavelength division multiplexer (13), load circuit (10), adjustable optic fibre delay line TFDL (11) and logic control circuit (12) are formed, light source (1) is by splitter (2), optical isolator (3) connects variable band-pass filter (4 respectively, 5,6), variable band-pass filter (4,5,6) is bonding strength modulator (7 respectively, 8,9), intensity modulator (7,8,) be connected to wavelength division multiplexer (13), the intensity modulator (9) that is connected with load circuit (10) is connected to wavelength division multiplexer (13) by adjustable optic fibre delay line TFDL (11), and logic control circuit (12) connects with intensity modulator (7,8) respectively.
3, the multi-wavelength light mark receiver of a kind of wavelength-time encoding method based on claim 1, it is characterized in that by splitter (14), tunable bandpass filters (16,17,18), light/electric transducer (19,20), serial/parallel transducer (21,22), synchronizer (23), judgement control circuit (24) and optical switch matrix compositions such as (25), splitter (14) connects variable band-pass filter (16 respectively by optical isolator (15), 17,18), variable band-pass filter (16), (17) connect light/electric transducer (19 respectively, 20), light/electric transducer (19,20) respectively by serial/parallel transducer (21,22) be connected to judgement control circuit (24), variable band-pass filter (18) connects synchronizer (23), and optical switch matrix (25) is connected with judgement control circuit (24) with synchronizer (23) simultaneously.
4,, it is characterized in that said SC light source (1) bandwidth is 200nm as the said multi-wavelength light mark of claim 2 transmitter.
5, as the said multi-wavelength light mark of claim 2 transmitter, it is characterized in that band pass filter (4,5) extract different signal wavelength and band pass filter (6) extracts the wavelength band that load signal is used, all in the same WDM communication channel of I-TUT regulation.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100407707C (en) * | 2006-03-03 | 2008-07-30 | 北京大学 | Network configuration for loading high-speed data business and trans mitting method |
| WO2008154881A1 (en) * | 2007-06-20 | 2008-12-24 | Huawei Technologies Co., Ltd. | Light mark, method and device for light mark modulating and demodulating |
| CN102231864A (en) * | 2011-06-20 | 2011-11-02 | 东南大学 | Optical-codeword-label-based optical packet multicast transmission and receiving methods and devices |
| CN101729185B (en) * | 2008-10-21 | 2013-06-05 | 华为技术有限公司 | Marking or detecting method of optical signals, device and marking and detecting system |
| CN104159170A (en) * | 2014-08-04 | 2014-11-19 | 武汉光盈科技有限公司 | Marking and analyzing devices suitable for optical signals, as well as optical signal marking and analyzing methods |
| CN104486001A (en) * | 2014-12-02 | 2015-04-01 | 苏州市欧博锐自动化科技有限公司 | Optical transmitter based on second-order high-pass filter circuit |
| CN108702216A (en) * | 2016-01-08 | 2018-10-23 | 阿罗伊斯·布赫梅尔 | For the system and method by light wave transmissions data, the computer program for the method for coded data and for executing this method |
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| CN113645189B (en) * | 2019-02-15 | 2022-06-28 | 华为技术有限公司 | Communication method, network node, storage medium and system chip |
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2002
- 2002-04-30 CN CNB021115710A patent/CN1156114C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100407707C (en) * | 2006-03-03 | 2008-07-30 | 北京大学 | Network configuration for loading high-speed data business and trans mitting method |
| WO2008154881A1 (en) * | 2007-06-20 | 2008-12-24 | Huawei Technologies Co., Ltd. | Light mark, method and device for light mark modulating and demodulating |
| US8265480B2 (en) | 2007-06-20 | 2012-09-11 | Huawei Technologies Co., Ltd. | Light mark, method and device for light mark modulation and demodulation |
| CN101729185B (en) * | 2008-10-21 | 2013-06-05 | 华为技术有限公司 | Marking or detecting method of optical signals, device and marking and detecting system |
| CN102231864A (en) * | 2011-06-20 | 2011-11-02 | 东南大学 | Optical-codeword-label-based optical packet multicast transmission and receiving methods and devices |
| CN102231864B (en) * | 2011-06-20 | 2014-04-16 | 东南大学 | Optical-codeword-label-based optical packet multicast transmission and receiving methods and devices |
| CN104159170A (en) * | 2014-08-04 | 2014-11-19 | 武汉光盈科技有限公司 | Marking and analyzing devices suitable for optical signals, as well as optical signal marking and analyzing methods |
| CN104486001A (en) * | 2014-12-02 | 2015-04-01 | 苏州市欧博锐自动化科技有限公司 | Optical transmitter based on second-order high-pass filter circuit |
| CN108702216A (en) * | 2016-01-08 | 2018-10-23 | 阿罗伊斯·布赫梅尔 | For the system and method by light wave transmissions data, the computer program for the method for coded data and for executing this method |
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| CN1156114C (en) | 2004-06-30 |
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