CN104052550A - Method for achieving 1-2 multicast of three paths of DPSK signals simultaneously - Google Patents

Method for achieving 1-2 multicast of three paths of DPSK signals simultaneously Download PDF

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Publication number
CN104052550A
CN104052550A CN201410277643.0A CN201410277643A CN104052550A CN 104052550 A CN104052550 A CN 104052550A CN 201410277643 A CN201410277643 A CN 201410277643A CN 104052550 A CN104052550 A CN 104052550A
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China
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signal
paths
multicast
dpsk
light
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CN201410277643.0A
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王宏祥
秦军
杨玉倩
刘川
纪越峰
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Beijing University of Posts and Telecommunications
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Beijing University of Posts and Telecommunications
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Priority to CN201410277643.0A priority Critical patent/CN104052550A/en
Priority to PCT/CN2014/082058 priority patent/WO2015192415A1/en
Publication of CN104052550A publication Critical patent/CN104052550A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/29—Repeaters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • H04B10/548—Phase or frequency modulation
    • H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

The invention discloses a method for achieving 1-2 multicast of three paths of DPSK signals simultaneously and belongs to the technical field of all-optical information processing. The method comprises the steps that after three paths of DPSK signal light are generated through a modulator, the relevance between signals is eliminated by means of an optical delay line, and then the signals enter an SOA through a coupler in a coupling mode; FWM effect is generated among the three paths of optical signals in the SOA, and then nine paths of idler-frequency light are generated; the phase information of two paths of the newly generated idler-frequency light is identical with that of the three paths of DPSK signal light originally input, and then 1-2 multicast of three paths of DPSK signals is achieved simultaneously under the condition that no extra pump light is available by filtering and receiving the two paths of light. The method is brought forward for the first time for achieving 1-2 multicast of three paths of DPSK signals simultaneously under the condition that no extra pump light is available.

Description

A kind of method that simultaneously realizes three road dpsk signal 1-2 signal multicasts
Technical field
The present invention relates to particularly in gateway node, utilize the third-order non-linear effect-four wave mixing (FWM) in nonlinear device semiconductor optical amplifier (SOA) under the condition that does not need pump light, to realize the method that Dui San road input dpsk signal carries out Dao Er road, road (1-2) multicast in a kind of optical-fiber network simultaneously, belong to full light signal processing technology field.
Background technology
Full light signal treatment technology is regarded as the very promising technology of tool in following optical-fiber network, development along with communications field transmission technology, broadband internet starts to popularize, the lifting of signal transmission rate and message capacity has brought many benefits to people, such as video conference, HDTV (High-Definition Television), long-distance education etc., but also to network, brought very large pressure simultaneously.What stand in the breach is exactly power problems, in wavelength-division multiplex system, need to have the multichannel photoelectricity corresponding with number of wavelengths, electro-optical signal change-over circuit.In addition, the routing and swiching in electric territory also has a large amount of power consumptions.Be exactly processing speed problem on the other hand, the processing speed in electric territory has become the bottleneck of whole optical network communication, and signal is processed and can effectively be alleviated the problems referred to above under the condition of full light.Therefore, full light signal treatment technology causes that people more and more pay close attention to, and it has wide development prospect and important realistic meaning as the important support technology of following optical-fiber network.
A key areas of full light signal treatment technology-full light signal multicast technology, by the signal on a wavelength is effectively multicast on a plurality of wavelength, and then can effectively promote network efficiency and resource utilization, along with extensively the emerging in large numbers of the business such as Data Migration of HDTV (High-Definition Television) business and data center, signal multicasting technology played more and more important effect in recent years.
Due to the importance of signal multicasting technology, caused in the last few years the research that people are extensive and deep, the main method of employing is that the different nonlinear effects in various different nonlinear devices complete by the pump light of some and flashlight.The nonlinear device relating to comprises highly nonlinear optical fiber (HNLF), semiconductor optical amplifier (SOA), quantum spot semiconductor image intensifer (QD-SOA), photonic crystal fiber (PCF), silica-based waveguides (Silicon Waveguide), silica-based nanowire (Silicon Nanowire) and periodic polarized lithium niobate waveguide (PPLN) etc.The main nonlinear effect adopting comprises that Cross-phase Modulation (XPM), XGM (XGM), four wave mixing (FWM) effect and various cascaded second-order nonlinear interaction are as cascade frequency multiplication difference frequency (cSHG/DFG) effect, cascaded sum frequency generation and difference frequency generation effect (cSFG/DFG) etc.Yet, current signal multicasting technology for be all the multicast of single input channel signal, not yet relate to the multicast to a plurality of input channel signal.Existing multicast scheme has all adopted the pump light of some simultaneously, has the expense of pump light.And the problem such as existing machine-processed ubiquity signal input power is high, conversion efficiency is low and system complexity is high.
As a kind of important nonlinear device, SOA has that nonlinear effect is strong, dynamic gain and dynamic range is large, compact conformation, the advantage such as easy of integration, in full light signal is processed, has special consequence.FWM effect based on SOA has the bit rate of signal and modulation format transparent, can in very wide wave-length coverage, realize higher gain, and the various relaxation of SOA (carrier density pulsation CDP, carrier h eating CH and the spectrum hole burning SHB) time is short.The multicast that adopts SOA to complete many input channel signal as nonlinear dielectric can obtain relatively high conversion efficiency, the lower extra advantages such as input signal power.
Along with people improve constantly the requirement of message capacity and quality, differential phase keying (DPSK) modulation format (DPSK) is because its good performance becomes the study hotspot of Fibre Optical Communication Technology aspect.DPSK modulation system to laser linewidth require relatively low, and use simple in structure, based on interferometer solution, be in harmonious proportion the receiver of direct-detection.The spectrum width of dpsk signal is between nonreturn to zero code (NRZ) and NRZ (RZ), higher than the spectrum efficiency of common RZ code, can improve dispersion tolerance, nonlinear tolerance and polarization mode dispersion tolerance limit, increases transmission range.Compare with traditional on-off keying (OOK) modulation system, dpsk signal can transmit farther distance and reduce the requirement to luminous power.Multicasting technology research for dpsk signal will play an important role in network, and the multicasting technology for multichannel input signal will further effectively promote network efficiency and performance simultaneously.
Summary of the invention
The invention provides a kind of method that simultaneously realizes three road dpsk signal 1-2 signal multicasts.Described technical scheme is as follows:
A kind of method that simultaneously realizes three road dpsk signal 1-2 signal multicasts comprises:
After three road dpsk signal light produce by modulator, be injected in SOA, three light waves interact FWM effect occur at SOA, altogether newly-generated 9 ideler frequency light simultaneously.Due to the internal mechanism of FWM, the part light of 9 newly-generated ideler frequency light carries identical information with the flashlight of input.Through demonstration, under the condition of San road dpsk signal light input, can complete the Dui Zhe tri-road signals multicast of 1-2 respectively simultaneously.
The beneficial effect of technical scheme provided by the invention is: adopt full light mode to carry out signal multicast, and the not restriction of power receiving equipment speed, structure is relatively simple, and easy operating is simultaneously transparent to format modulation signal.Adopt SOA as nonlinear dielectric, FWM conversion efficiency is relatively high, requires lower to the input power of signal simultaneously.In whole multicast procedures, without any extra pump light source, reduced overhead.The present invention realizes the multicast that multichannel (3 tunnel) dpsk signal is completed in the presence that there is no pump light simultaneously to Dao Er road, road (1-2) signal first, still belongs to industry first.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention, below the accompanying drawing of required use during the embodiment of the present invention is described is briefly described, obvious, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under creative work prerequisite the more accompanying drawing that can also obtain according to these accompanying drawings.
Fig. 1 is a kind of method step flow chart of simultaneously realizing three road dpsk signal 1-2 signal multicasts that the embodiment of the present invention provides;
Fig. 2 is a kind of schematic diagram of simultaneously realizing the method for three road dpsk signal 1-2 signal multicasts that the embodiment of the present invention provides;
The truth table of each phase of light wave of a kind of method that simultaneously realizes three road dpsk signal 1-2 signal multicasts that Fig. 3 is that the embodiment of the present invention provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described.Obviously, described example is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to protection range of the present invention.
Referring to a kind of method step flow chart of realizing three road dpsk signal 1-2 signal multicasts of Fig. 1 the present embodiment simultaneously, comprising:
S101: treat the generation of multicast San road dpsk signal;
This method for dpsk signal carry out multicast.Three road light carriers produce by light source, enter respectively modulator and produce three road dpsk signals.Polarization Controller is for conditioning signal polarisation of light state.The 2nd road and the 3rd road flashlight use respectively optical delay line (ODL) to remove the correlation between signal.Produce San road dpsk signal by 21 * 2 coupler couplings.
S102: trigger FWM process, produce new ideler frequency light, and then realize method of multicasting set forth in the present invention;
There is FWM effect in three road dpsk signal light, as shown in Figure 2, will produce 9 new tunnel ideler frequency light in SOA.Three tunnel input dpsk signal light lay respectively at frequency f 1, f 2and f 3place, by the FWM process in SOA at f 113, f 123,213, f 223, f 112, f 221, f 132,312, f 231,321, f 332, f 331place generates new flashlight.Multicast Ge road signal meets with original flashlight in frequency: f abc=f a+ f b-f c(c selects from 1,2,3 for a, b).Between the phase place of 3 road flashlights of the phase place of newly-generated ideler frequency light and original input, meet relation as shown in table 1, because phase place exists the periodicity of 2pi, at f 221, f 331locate the entrained phase information of ideler frequency light identical with the information of the flashlight 1 of input.At f 112, f 332locate the entrained phase information of ideler frequency light identical with the information of the flashlight 2 of input.At f 113, f 223locate the entrained phase information of ideler frequency light identical with the information of flashlight 3.(frequency is f 123,213, f 132,312, f 231,321the flashlight at place can not keep in full accord with the information of original input signal light.) based on above principle, thus realized the multicast to the signal on the dpsk signal difference one Dao Er road, road (1-2) of 3 tunnel inputs.
S103: the reception to the dpsk signal of multicast;
By the newly-generated Ge of step S102 road flashlight, by filter, leach, and then enter receiver and receive, demodulation recovers primary signal.
Finally explanation: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that; Its technical scheme that still can record aforementioned each embodiment is modified, or technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.

Claims (3)

1. a method that simultaneously realizes three road dpsk signal 1-2 signal multicasts, is characterized in that: Dui San road dpsk signal light carries out multicast simultaneously, employing be three four-wave mixing effects between light wave.
2. method according to claim 1, is characterized in that: when signal is carried out to multicast, completed wavelength conversion, Dui San road dpsk signal has completed respectively the signal multicast of 1-2 simultaneously.
3. method according to claim 1, is characterized in that: without extra pump light input, can complete three tunnel input dpsk signals multicast simultaneously.
CN201410277643.0A 2014-06-19 2014-06-19 Method for achieving 1-2 multicast of three paths of DPSK signals simultaneously Pending CN104052550A (en)

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PCT/CN2014/082058 WO2015192415A1 (en) 2014-06-19 2014-07-11 Method for multicasting 1 to 2 paths of signals among three paths of dpsk signals

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