CN101272631B - Optical packet head extracting structure used for asynchronous optical packet switching network - Google Patents
Optical packet head extracting structure used for asynchronous optical packet switching network Download PDFInfo
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- CN101272631B CN101272631B CN2008100247795A CN200810024779A CN101272631B CN 101272631 B CN101272631 B CN 101272631B CN 2008100247795 A CN2008100247795 A CN 2008100247795A CN 200810024779 A CN200810024779 A CN 200810024779A CN 101272631 B CN101272631 B CN 101272631B
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Abstract
The invention discloses a retrieval structure of an optical packet head used in an exchange network of an asynchronous optical packet, which comprises a light splitter, a reflective semiconductor amplifier, a first circulator, a second circulator and a coupler; an input terminal of the light splitter is connected with packet input waveguide; a first output terminal of the light splitter is connected with a d port of the second circular through fiber delay lines, so that control signals which pass through the light splitter and are delayed are inputted to the reflective semiconductor amplifier; a second output terminal of the light splitter is connected with an a port of the first circulator; a b port of the first circulator is connected with the input/output terminal of the reflective semiconductor amplifier; a c port of the first circulator is connected with a first input terminal of the coupler; the input/output terminal of the reflective semiconductor amplifier is connected with ane port of the second circulator; an f port of the second circulator is connected with a second input terminal of the coupler. The retrieval structure of the optical packet head can increase on-off ratio of a system.
Description
Technical field
The present invention relates to a kind of full optical packet head extracting structure, relate in particular to a kind of optical packet head extracting structure that is used for asynchronous optical packet switching network based on reflection type semiconductor image intensifer (RSOA).The present invention can be used in the high-speed light transmission link, realizes the extraction to optical packet head (being address code) in the light grouping bag.
Technical background
Optical packet switching technique (The optical packet switching OPS) is considered to have most in the third generation optical-fiber network switching technology of development prospect.Because lack light RAM technology, full optical routing becomes the important bottleneck of development of optical network.But then, full optical router can be developed at wavelength domain and realize exchange and competition mechanism, can realize the transmission of high speed multi-wavelength signals simultaneously under the condition of low-power consumption and low channel disturbance, and this point is that electric switching technology is incomparable.
OPS technology specific implementation promptly is carried in the head of light load with an optical packet head, be used in the Optical Switch Node routing forwarding.Because the information that optical packet head comprises is less relatively, so can adopt low speed transmissions.At each switching node, need extract packets headers separately, send into identification and forwarding that control unit carries out the address.Input Control Element is surveyed header address information, searches and transmits, and simultaneously according to race condition, judges and forwarding address.Output control unit produces new packets headers according to new routing state table control output interface and is loaded on the light load, finishes packet switching.As the part of OPS technology, whether the extraction quality of optical packet head accurately and fast has direct influence to control unit identification address information.
At present, more existing schemes are in order to finish the packet header extraction of grouping.In these methods, light negative carrier technology or motor synchronizing scheme are adopted in the extraction of packets headers.Though these schemes can realize the extraction of packets headers, its complexity, synchronism will limit its expansibility and range of application, and on-off ratio does not reach very high level yet.
Because semiconductor optical amplifier (SOA) has low-power consumption, low time delay, high stable type and be convenient to advantages such as integrated is widely used in Clock Extraction, and electrooptic modulation etc. also are used for the extraction of packets headers.The existing at present packet header extraction scheme that adopts one or two semiconductor optical amplifier structures is very high but on-off ratio can not reach.The present invention adopts a reflection type semiconductor image intensifer as non-linear element, surveys light and experienced twice gain and phase shift in RSOA, and system has obtained higher on-off ratio, has improved the effect of packet header extraction.Simultaneously, utilize RSOA can reduce the strict demand of common SOA, reduce manufacture difficulty the end face reflectivity.
Summary of the invention
The invention provides and a kind ofly can improve on-off ratio and be convenient to the integrated optical packet head extracting structure that is used for asynchronous optical packet switching network.
The present invention adopts following technical scheme:
A kind of optical packet head extracting structure that is used for asynchronous optical packet switching network, comprise optical splitter, the reflection type semiconductor image intensifer, first circulator and second circulator and coupler, input at optical splitter is connected with grouping bag input waveguide, first output of optical splitter is connected with the d port of second circulator through fibre delay line, be used for will through optical splitter obtain and delayed after control signal input to the reflection type semiconductor image intensifer, second output of optical splitter is connected with a port of first circulator, the b port of first circulator is connected with the I/O end of reflection type semiconductor image intensifer, the c port of first circulator is connected with the first input end of coupler, the I/O end of reflection type semiconductor image intensifer is connected with the e port of second circulator, and the f port of second circulator links to each other with second input port of coupler.
Survey light and once pass through semiconductor optical amplifier (SOA), can obtain certain gain and phase shift, because packets headers (address) is different with the speed of payload (data), packets headers can adopt lower rate transmissions, payload adopts high-speed transfer, thus packets headers through SOA the time, gain and phase shift that the gain of acquisition and phase shift obtain greater than payload, but both gain inequalities (being on-off ratio) can further improve.The RSOA structure that the present invention proposes can satisfy this requirement.Survey light when arriving the RSOA right side, a part is surveyed transmittance and is gone out RSOA, because end face reflection, another part is surveyed the active area that light (being referred to as reverberation here) returns RSOA again, control light and arrive RSOA this moment, causes RSOA gain saturation, and reverberation experiences gain and phase shift once more, though be saturation gain and phase shift, gain and phase shift that gain that current packets headers obtains and phase shift also obtain greater than payload.Like this, on-off ratio further significantly improves on original basis.
Catoptrical on-off ratio is after having experienced twice gain and phase shift, and it is very high that on-off ratio has reached.And reverberation and transmitted light be after the adjustable coupler place of coupling ratio interferes output, and on-off ratio can improve again once more.
Comprehensive said process, the packet header of surveying light divides and has experienced a unsaturation gain and phase shift (greatly) and saturation gain and phase shift, and payload has experienced twice saturation gain and phase shift (little), adds the interference at the coupler place of last reverberation and transmitted light, and on-off ratio is improved for three times.At last, the system switching of output is than reaching high level.
2, beneficial effect
1) the packets headers part of twice amplification of reflection type semiconductor image intensifer grouping bag of the present invention's employing has improved the system switching ratio greatly.
2) the reflection type semiconductor image intensifer that uses of the present invention have not only that general semiconductor amplifier volume is little, low-power consumption, low time delay, high stable type and be convenient to advantages such as integrated, also have and reduce of the strict demand of general semiconductor amplifier, reduce the advantage of manufacture difficulty the right side reflectivity.
3) system is not high to parameter request.When parameters such as the small signal gain of the coupling of coupler, reflection type semiconductor image intensifer, active area cross-sectional area, carrier lifetime, effective refractive index changed, system still can obtain high on-off ratio.
4) the present invention is transparent to the packets headers transmission rate, can realize the extraction of different rates packets headers.
5) the present invention is simple in structure, adopts the reflection type semiconductor image intensifer, coupler, and circulator, fibre delay line and normal optical waveguide have realized the optical packet head extraction.
Description of drawings
Fig. 1 is a structural representation of the present invention.Among the figure: 1, grouping bag input port, 2, optical splitter, 3, the control impuls transmission optical waveguide, 4, fibre delay line, 5, reflection type semiconductor image intensifer, 6, second circulator, 7, the transmitted light transmission optical waveguide, 8, first circulator, 9, reflection type semiconductor image intensifer first port, 10, second port of reflection type semiconductor image intensifer, 11, coupler, 12, coupler output port, 13, through another output port of coupler.
Fig. 2 is that the packets headers transmission rate is the packet header extraction design sketch of 2.5G/s, and wherein, Fig. 2 a is the 15 bit light grouping bag pulse diagram of port one input, and Fig. 2 b is the optical packet head pulse diagram of port one 3 outputs.
Fig. 3 is that the packets headers transmission rate is the packet header extraction design sketch of 622M/s, and wherein, Fig. 3 a is the 15 bit light grouping bag pulse diagram of port one input, and Fig. 3 b is the optical packet head pulse diagram of port one 3 outputs.
Specific embodiments
A kind of optical packet head extracting structure that is used for asynchronous optical packet switching network, comprise optical splitter 2, reflection type semiconductor image intensifer 5, first circulator 8 and second circulator 6 and coupler 11, input at optical splitter 2 is connected with grouping bag input waveguide 1, first output of optical splitter 2 is connected with the d port of second circulator 6 through fibre delay line 4, be used for will through optical splitter 2 obtain and delayed after control signal input to reflection type semiconductor image intensifer 5, second output of optical splitter 2 is connected with a port of first circulator 8, the b port of first circulator 8 is connected with the I/O end 9 of reflection type semiconductor image intensifer 5, the c port of first circulator 8 is connected with the first input end of coupler 11, the I/O end 10 of reflection type semiconductor image intensifer 5 is connected with the e port of second circulator 6, and the f port of second circulator 6 links to each other with second input port of coupler 11.Described optical splitter is realized the merit branch, and the power inequality is distributed, and its ratio is 95: 5～99: 1.
The grouping bag is imported from port one, through optical splitter 2, output is divided into the signal (emulation is herein chosen 95: 5) that two-way power does not wait, strong signal enters fiber waveguide 3 as control signal Pc, weak signal enters fiber waveguide 7 as surveying light Ps, because control light Pc is through the delay of fibre delay line 4, and detection light Ps does not pass through the delay of delay line, arrives reflection type semiconductor image intensifer 5 so survey light prior to control light.
Survey light through the first loop device 8 after, at first arrive reflection type semiconductor image intensifer 5.Packets headers is because transmission rate is low, and its pulse period is greater than RSOA carrier lifetime, thus experienced unsaturated gain and phase shift, and the speed height of payload, its pulse period is less than carrier lifetime, so experience saturation gain and phase shift.And behind the control light process fibre delay line 4 and the second loop device 6, enter reflection type semiconductor image intensifer 5 from port one 0, cause reflection type semiconductor image intensifer 5 gain saturations, survey light simultaneously at reflection type semiconductor image intensifer 5 right side separated into two parts, enter the active area of reflection type semiconductor image intensifer 5 after the part reflection again, because control light has caused the gain saturation of reflection type semiconductor image intensifer 5, so detection light reflected has this time experienced saturated gain and phase shift, and the gain that the gain of packets headers acquisition this time also obtains greater than payload.All the other are surveyed transmittance and go out reflection type semiconductor image intensifer 5, through the second loop device 6, enter coupler 11 after the outgoing of f port, behind the reverberation experience RSOA, from incident port 9 outgoing of RSOA, by first circulator 8, after the outgoing of c port, enter coupler 11.At last, transmitted light and reverberation are interfered at coupler 11 places, and packets headers is interfered long mutually, and in port one 3 outputs, payload is suppressed.
Case one is imported 15 bit groupings bags, and its form is (101011001101010), and preceding 5 pulses are packets headers, and its transmission rate is 2.5G/s, and back 10 pulses are payload, and its transmission rate is 40G/s.RSOA right side reflectivity is 10%, and the coupling ratio of coupler is 30: 70.The numerical simulation result is as follows:
Fig. 2 (a) is depicted as the 15 bit light grouping bag pulse from the port one input.Fig. 2 (b) is depicted as the optical packet head pulse of extracting from port one 3.Calculate: compare with input pulse, the energy of output packets headers pulse has amplified 30dB approximately, and the payload pulse has only been amplified about 5dB, with respect to the packets headers pulse, can regard as and is suppressed, and from Fig. 2 (b) as can be seen, payload has been suppressed substantially.Output is opened the light than up to 25dB.
Case two, input grouping packet format is constant, and optical packet head and payload speed are respectively 622Mb/s and 40Gb/s.Choose parameter constant, simulation result such as Fig. 3.
Fig. 3 (a) is depicted as the 15 bit light grouping bag pulse from the port one input.Fig. 3 (b) is depicted as the optical packet head pulse of extracting from port one 3.Numerical simulation is the result calculate, and when the packets headers transmission rate was changed into 622Mb/s, the output on-off ratio also can reach 23dB.
Claims (2)
1. optical packet head extraction element that is used for asynchronous optical packet switching network, it is characterized in that comprising optical splitter (2), reflection type semiconductor image intensifer (5), first circulator (8) and second circulator (6) and coupler (11), input at optical splitter (2) is connected with grouping bag input waveguide (1), first output of optical splitter (2) is connected with the d port of second circulator (6) through fibre delay line (4), be used for will through optical splitter (2) obtain and delayed after control signal input to reflection type semiconductor image intensifer (5), second output of optical splitter (2) is connected with a port of first circulator (8), the b port of first circulator (8) is connected with the first I/O end (9) of reflection type semiconductor image intensifer (5), the c port of first circulator (8) is connected with the first input end of coupler (11), the second I/O end (10) of reflection type semiconductor image intensifer (5) is connected with the e port of second circulator (6), the f port of second circulator (6) links to each other with second input port of coupler (11), first of coupler (11), the packet signal of second input input produces interference in coupler (11), second output port (13) output from coupler (11) finally realizes the extraction of optical packet head.
2. the optical packet head extraction element that is used for asynchronous optical packet switching network according to claim 1 is characterized in that described optical splitter realization merit branch, and the power inequality is distributed, and its ratio is 95: 5～99: 1.
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| CN101715152B (en) * | 2009-11-18 | 2013-06-12 | 北京邮电大学 | Method and device for extracting optical packet |
| CN101877799B (en) * | 2009-11-18 | 2013-01-23 | 北京邮电大学 | Extraction device and method of optical packet |
| CN103686465B (en) * | 2012-09-12 | 2016-12-21 | 上海贝尔股份有限公司 | Optical network node, optical network unit and communicating between the optical network unit of low delay |
| CN106093492B (en) * | 2016-06-22 | 2019-01-04 | 北京铭峰科技有限公司 | A kind of pulse signal generation method of the test of the CS115 suitable for GJB151B-2013 |
| CN112040353B (en) * | 2020-09-08 | 2022-11-29 | 东南大学 | Distributed edge computing system based on optical packet switching |
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