CN100576946C - The novel full light serial-parallel conversion method that is used for the high-speed light packet switching - Google Patents
The novel full light serial-parallel conversion method that is used for the high-speed light packet switching Download PDFInfo
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Abstract
A kind of novel full light serial-parallel conversion method.Comprise: producing repetition rate by the psec light impulse source is the light pulse of M/N Hz; After amplifying, erbium-doped fiber amplifier makes spectrum widening by dispersion shifted optical fiber; Again by N road Wave decomposing multiplexer, the M/N Hz burst pulse of output N road different wave length regulates entering N road wavelength division multiplexer again behind the transmission delay on every road and carry out time-division/wavelength division multiplexing, the periodically variable M Hz of output wavelength light pulse then; The circuit light signal of above-mentioned M Hz light pulse and M bit/s carries out wavelength conversion, wherein M bit/s line signal is as control light, M Hz light pulse is as controlled light, and the information of circuit light signal has just been duplicated in the MHz light pulse, becomes the M bit/s light signal of wavelength period variation; Enter N road Wave decomposing multiplexer again, the light pulse on the different sequential has so just been finished full light string and conversion because the difference of wavelength just from the different port output of Wave decomposing multiplexer, can be exported through different time delay optical fiber respectively at last more simultaneously.
Description
[technical field]:
The present invention relates to communication technical field, particularly the string of high-speed optical signal and switch technology.
[background technology]:
Along with the explosive increase of Internet data volume and the expansion gradually of radio communication 3G business, the bandwidth of communication network and the requirement of capacity are also sharply increased.Therefore, two of communication network big chief components---transmission and exchange all are faced with unprecedented challenge.At hop, the DWDM development of technology makes can carry up to a hundred wavelength channels on the optical fiber, and the transmission rate tidemark has reached the Tb/s level.Along with the development of optical transport technology, bandwidth no longer is the bottleneck of network.The commercial system of 40Gb/s can be practical at present.But in the high-rate packets exchange, still there is not too big breakthrough.The exchange of high-quality data service is still adopted as multitiered network organization plans such as IP over SDH, and expense is huge, can't make full use of bottom DWDM bandwidth resources and powerful wavelength routing capabilities.The high-rate packets switching network that development has the height survivability becomes broadband communication network future development target.
The exchanged form that adopts is light path exchange OCS at present, and network need be the light path (each link on all need distribute a professional wavelength) of each connection request foundation from the source end to the destination end.The shortcoming of light path exchange is that the bandwidth availability ratio of network is not high, whether communicating pair is in talking state in case path is established, and the circuit of distribution is all occupied always, and the circuit connecting time is long, communication efficiency is low, can not communicate by letter between the different types of terminals user.
In the long run, light packet switching OPS (Optical Packet Switching) is the developing direction of light exchange.The main advantage of optical packet switching technique is: the one, and capacity is big, the transparency of data transfer rate and form is high, configurability can be supported characteristics such as following different types of data flexibly; The 2nd, optical channel or connectionless transmission end to end can be provided; The 3rd, bandwidth usage efficient height can provide various services, satisfies client's demand; The 4th, a large amount of reciprocal exchange of business is transferred to the light territory, exchange capacity and DWDM transmission capacity coupling, with of combine optimization and the reasonable resources utilization that can realize network of time group technology with new technologies such as OXC, MPLS, ASON, thereby optical packet switching technique certainly will become " favorite " of all-optical network planning of future generation.
The history of existing more than ten years of the development of optical packet switch network, a lot of in the world countries have done the research of this respect.But with regard to present light signal treatment technology, also be far from reaching the degree that signal can be handled in the light territory, must handle and buffer memory through the header that carries out packet after the opto-electronic conversion again.And, also can handle the light grouped data (10Gb/s or higher 40Gb/s) with the buffer memory two-forty far from present computer and electric random asccess memory (RAM) processing speed, so just make that the jumbo advantage of optical communication is all gone.So want to continue to improve the performance of existing network, must solve the technical problem of light packet switching.Further, realize the light packet switching, the one, handle the head protocols of High Rate Packet Data; The 2nd, carry out buffer memory to the high-speed light packet.
For the treatment technology of head, present head protocols commonly adopts the data of low rate, so that computer can be handled it.And common several schemes of header and data separating are had: 1, the serial header flag method of fixed rate; 2, the multiplexing header flag method of light carrier; 3, the orthogonal modulation technique that combines with phase modulated of intensity modulated; 4, light carrier inhibition and isolation technics etc.These schemes respectively have characteristics, but generally, all have the complexity of data and header modulation isolation technics; Header and data mutual interference mutually; The low rate header takies too much bandwidth; With problem such as existing communication system is incompatible.In addition, adopt the way of full light to carry out the experiment report that header is handled in addition, but because the technical maturation that also is far from of optical treatment, the function that can realize is also very original at present.At foreseeable future, still can not finish the processing of agreement with the way of full light.
The another one problem is the problem of optics buffer memory, because photon is boson, does not have rest mass, so it is very big to realize that light is stored difficulty at random, to such an extent as to the light internal memory still is in the very original stage now, does not also have the appearance of light RAM.So far, be used to realize that light stores the two kinds of technology that mainly contain at random: a kind of is to store with optical bistability; Another kind is to use fibre delay line.The shortcoming of fibre delay line is the cost costliness, the volume heaviness, and be difficult to guarantee temperature stability.And in order to guarantee the storage characteristics at random of system, whole system will be very complicated.
In the meeting of ECOC ' 2004 and APOC ' 2005, people such as the T.Nakahara of NTT have reported the experiment of the photon RAM of a kind of 40Gbit/s of being used for light packet switching.The thought of this scheme is to adopt novel string and switch technology that the line signal of two-forty is become the parallel signal of low rate, and signal just can adopt existing electric RAM to store at random and data processing like this.The advantage of this technology is, 1, do not have special change for line signal, and modulation system, the agreement of existing signal can be constant; 2, ripe electronic technology has been adopted in the storage of signal and processing, thereby has very strong practicality.3, since electricity storage header data can be stored on the one hand so that under lower rate conditions the process head protocol data, if memory capacity is enough, also whole Frame can be stored, store-transmit.So just can solve two subject matters of present two-forty light packet switching simultaneously.
The main thought of this scheme and characteristics show in serial/parallel, the parallel/serial conversion of two-forty.But problem also mainly appears on these two links.Main problem has: 1, by the imagination of this scheme, the signal of 40Gbit/s will drop to speed can make system's continuous operation (less than 400Mb/s).Parallel way after the conversion must be greater than 100 the tunnel, and this scheme has adopted the very complicated three-dimensional wave guide structure of design, (actual report way has only 16 the tunnel may to reach this requirement hardly, therefore this system can't handle the light datagram under the continuous 40Gbit/s speed, and the repetition rate of the 33bit datagram of experiment report only is 42MHz).2, the loss of the string of this scheme and conversion and way also proportional (100 tunnel insertion loss minimum in theory is 20dB), this has also limited the increase of way.3, the all-optical switch that adopts in the report is multiple signals concurrently injected (being 16 road signals+1 way control switch signal in the experiment), and under the too many situation of way, total power signal and mutual interference among signals cause this system can't operate as normal the most at last.So, although the thought of this scheme is extraordinary, very big defective is arranged itself with regard to scheme, be difficult to reach the requirement of real practicability.
By above analysis, want really to reach practical, a good serial/parallel scheme should solve following problem: 1, scheme will be tried one's best simply, and its complexity should be an acceptable under the condition of way＞100 tunnel.2, under the condition that way increases, inserting loss should not increase too much.3, working performance of devices should not descend owing to way increases in the system.
Domestic present theory and experimental study about the light packet switching also is in the starting stage, relevant theory and experimental study phoenix feathers and unicorn horns.
In sum, in a very long time, the processing of two-forty light signal still needs to adopt the electronic device than low rate to finish with storage.Like this, just the light signal of two-forty need be become signal, so the serial/parallel switch technology of two-forty light is vital than low rate.If break through in this technical acquisition, not only can realize the header processing capacity, and the storage that can directly apply to the light grouped data transmits, thereby realizes the light packet switching, and the serial/parallel switch technology of two-forty light also is being coming aspect other two-forty light signal treatment technology in addition.
[summary of the invention]:
The objective of the invention is to solve the deficiency in the said method, a new full light serial-parallel conversion method that can be used for the 40Gbit/s system is provided, and can expand realization greater than 100 tunnel string and conversion.
The novel full light serial-parallel conversion method that is used for the high-speed light packet switching provided by the invention, with the high-speed line light signal of M bit/s, by string and the conversion of 1:N, the low speed light signal of output N road M/N bit/s, concrete steps are as follows:
1) producing repetition rate by the psec light impulse source is M/N Hz, the pulse duration light pulse less than (1/M) s;
2) above-mentioned light pulse is amplified the back through erbium-doped fiber amplifier (EDFA) and is passed through dispersion shifted optical fiber (DSF), makes spectrum widening arrive input wavelength scope greater than N road Wave decomposing multiplexer;
3) light pulse behind the spectrum widening is carried out the spectrum section by N road Wave decomposing multiplexer again, burst pulse from N wavelength of different port outputs, by the decay of adjusting each road the energy of N road pulse is kept in balance, each road adds the optical fiber of different length then, regulate the transmission delay on every road, wherein the 1 road signal does not add time-delay, the delay inequality of i road signal and the 1 road signal is (i-1)/M, i=2 to N wherein, and then enter N road wavelength division multiplexer, carry out wavelength-division/time division multiplexing simultaneously, the periodically variable M Hz of output wavelength light pulse;
4) the circuit light signal of above-mentioned M Hz light pulse and M bit/s injects the high-speed adjustable optical transponder unit synchronously, wherein M bit/s line signal is as control light, the M Hz light pulse of wavelength period variation is as controlled light, after utilizing cross gain effect to realize wavelength conversion, the information of circuit light signal has just been duplicated in the M Hz light pulse of wavelength period variation, becomes the M bit/s light signal of wavelength period variation;
5) the M bit/s light signal of above-mentioned wavelength period variation enters N road Wave decomposing multiplexer again, light pulse on the different sequential is owing to the difference of wavelength is just exported from the different port of Wave decomposing multiplexer, add the optical fiber of different length as time-delay in each back, road of Wave decomposing multiplexer output more at last, wherein N road signal does not add time-delay, the delay inequality of i road signal and N road signal is (N-i)/M, i=1 to N-1 wherein, each light pulse has so just been finished a full light string and conversion through output simultaneously after the different time-delays.
Advantage of the present invention and good effect: the present invention program can overcome the deficiency of existing scheme theoretically, can expand realization greater than 100 tunnel string and conversion, for the research of next step photon random asccess memory (Photonic RAM) and the final realization of light packet switching are laid a good foundation.Simultaneously, the full light string of two-forty and the switch technology of this programme proposition also have good application prospects in other high speed signal process field.
[description of drawings]:
Fig. 1 is a conversion method general structure schematic diagram of the present invention.
[embodiment]:
Embodiment 1
Referring to Fig. 1, string and conversion with 16 tunnel illustrate:
1) producing repetition rate by the psec light impulse source is the light pulse of 2.5GHz, and it is narrow that repetition rate is that the light pulse of 2.5GHz is pressed earlier, makes its pulse duration less than 25ps;
2) above-mentioned pulsed light is amplified into dispersion shifted optical fiber (DSF) by erbium-doped fiber amplifier (EDFA), makes its spectrum widening greater than 12.8nm;
3) light pulse behind the broadening is carried out spectrum section (present embodiment N selects 16) by 16 tunnel Wave decomposing multiplexer again, obtains 16 road wavelength differences but repetition rate all is the light pulse of 2.5GHz;
4) every road signal is adjusted its time-delay by the optical fiber of suitable length, and wherein the 1 road signal does not add time-delay, and the delay inequality of i road signal and the 1 road signal is (i-1)/(4*10
10), i=2 to 16 wherein, again through No. 16 wavelength division multiplexers, it is multiplexing to carry out wavelength-division and time-division duplex, obtains the pulsed light of wavelength period variation;
5) this pulsed light enters wavelength shifter, as Be Controlled light;
6) the high-speed line light signal of 40Gbit/s is also sent into wavelength shifter, as control light;
7) the circuit light signal of the light pulse of this wavelength period variation and 40Gbit/s injects wavelength shifter simultaneously, wherein the circuit light signal of 40Gbit/s is as control light, like this, the circuit light signal is through wavelength conversion, and, resolve into the low speed light signal that 16 tunnel speed are 2.5Gbit/s by behind 16 road Wave decomposing multiplexers; For different pulses, the corresponding different wavelength of light source, output signal through a Wave decomposing multiplexer after, the light pulse of diverse location since the difference of wavelength just export from different ports; Each light pulse back, road from Wave decomposing multiplexer output adds different fiber delay times again, and the 16 the tunnel does not add fiber delay time, and in light pulse back, i road, adding is (16-i) * (C/n1)/(4*10 with the 16 road fiber lengths difference
10) optical fiber as time-delay, i=1 to 15 wherein, C is the light velocity, n1 is an optical fibre refractivity, C/n1 is the transmission rate of light in optical fiber, each light pulse has so just been finished string and conversion through output simultaneously after the different time-delays like this.
The present invention is to same being suitable for of the string more than 16 tunnel and conversion (as 50 tunnel, 100 tunnel etc.).
Claims (1)
1, a kind of novel full light serial-parallel conversion method that is used for the high-speed light packet switching is characterized in that this method realizes as follows:
1) producing repetition rate by the psec light impulse source is M/N Hz, the pulse duration light pulse less than (1/M) s;
2) above-mentioned light pulse is amplified the back through erbium-doped fiber amplifier (EDFA) and is passed through dispersion shifted optical fiber (DSF), makes spectrum widening arrive input wavelength scope greater than N road Wave decomposing multiplexer;
3) light pulse behind the spectrum widening is carried out the spectrum section by N road Wave decomposing multiplexer again, burst pulse from N wavelength of different port outputs, by the decay of adjusting each road the energy of N road pulse is kept in balance, each road adds the optical fiber of different length then, regulate the transmission delay on every road, wherein the 1 road signal does not add time-delay, the delay inequality of i road signal and the 1 road signal is (i-1)/M, i=2 to N wherein, and then enter N road wavelength division multiplexer, carry out wavelength-division/time division multiplexing simultaneously, the periodically variable M Hz of output wavelength light pulse;
4) the circuit light signal of above-mentioned M Hz light pulse and M bit/s injects the high-speed adjustable optical transponder unit synchronously, wherein M bit/s line signal is as control light, the M Hz light pulse of wavelength period variation is as controlled light, after utilizing cross gain effect to realize wavelength conversion, the information of circuit light signal has just been duplicated in the M Hz light pulse of wavelength period variation, becomes the M bit/s light signal of wavelength period variation;
5) above-mentioned periodically variable M bit/s light signal enters N road Wave decomposing multiplexer again, light pulse on the different sequential is owing to the difference of wavelength is just exported from the different port of Wave decomposing multiplexer, add the optical fiber of different length as time-delay in each back, road of Wave decomposing multiplexer output more at last, wherein N road signal does not add time-delay, the delay inequality of i road signal and N road signal is (N-i)/M, i=1 to N-1 wherein, each light pulse has so just been finished a full light string and conversion through output simultaneously after the different time-delays.
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| CN101916026B (en) * | 2010-08-05 | 2011-12-14 | 天津大学 | Device for converting wavelength division multiplexing (WDM) of single-fiber loop into time division multiplexing (TDM) in fiber sensor network |
| CN103222214A (en) * | 2012-11-12 | 2013-07-24 | 华为技术有限公司 | Method and apparatus of wavelength division multiplexing optical network transmission |
| CN106452580A (en) * | 2016-06-30 | 2017-02-22 | 华南理工大学 | Visible light communication coding method compatible with smartphone camera and system thereof |
| CN107817640A (en) * | 2017-11-03 | 2018-03-20 | 天津大学 | A kind of big serioparallel exchange than light serioparallel exchange system |
| CN111504978B (en) * | 2020-05-13 | 2021-03-30 | 华中科技大学 | Pulse type time-delay dispersion spectral measurement method and device and spectral imaging method and device |
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