CN104767568A - Full-gloss pseudo-random code optical-signal rate multiplier - Google Patents
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Abstract
The embodiment of the invention provides a full-gloss pseudo-random code optical-signal rate multiplier. According to the full-gloss pseudo-random code optical-signal rate multiplier, in a rate multiplying unit, a first coupler comprises an input end, an output end, a third end and a fourth end. The third end of the first coupler is connected with the fourth end of the first coupler sequentially through an optical fiber delayer, a first erbium-doped optical fiber amplifier, an isolator and a smoothing device to form a feedback loop. The input end of the first coupler receives a pseudo-random code optical-signal to be accelerated. The output end of the first coupler outputs a high-speed pseudo-random code optical signal generated after the rate is amplified. By means of the full-gloss pseudo-random code optical-signal rate multiplier, the rate of pseudo-random code optical signals are increased by 2n times, the pseudo-random code optical signals are obtained, and the peak power of the high-speed pseudo-random code optical signals can be balanced. The full-gloss pseudo-random code optical-signal rate multiplier is suitable for the pseudo-random code optical signals of different cycle lengths, the response speed is high, and the requirements of being simple in structure, easy to operate and stable in working are met.
Description
Technical field
The present invention relates to technical field of photo communication, particularly relate to a kind of full light pseudo noise code optical signal rate multiplier.
Background technology
PRBS (Pseudo-Random Binary Sequence, pseudo-random binary sequence) be widely used in optical transmission system and optical communication network, mainly comprise error rate measurement, coding/decoding (scrambler, descrambling), encrypt/decrypt (secure communication), simulating the white noise, band spectrum modulation (code division multiple access) etc.But along with the high speed development of optical communication technique, the network transmission speed of communication system is more and more higher, and current single channel reaches 640Gb/s, the corresponding rate requirement for PRBS also improves greatly.
Single structure is very not complicated for the high speed PRBS generator in traditional electrical field, and cost is very high, and particularly when transmission speed reaches more than 40Gb/s, due to the restriction of electronic bottleneck, this problem is more and more outstanding.Recent high speed full optical PRBS generator has also proposed some schemes, but these schemes more or less face the problems such as undesirable in complex structure, output effect, rate-constrained, and individual program is also only limited to theoretical simulation.
How developing a kind of high efficiency high speed full optical PRBS generator is a problem demanding prompt solution.
Summary of the invention
The embodiment provides a kind of full light pseudo noise code optical signal rate multiplier, to realize the high speed pseudo noise code light signal obtaining rate multiplication and power equalization.
A kind of full light pseudo noise code optical signal rate multiplier, comprise: rate multiplication unit, in described rate multiplication unit, first coupler comprises input, output, 3rd end and the 4th end, by the 3rd end of described first coupler successively through fiber delay line, first erbium-doped fiber amplifier, isolator, filter, couple together with the 4th end of described first coupler, form a feedback loop, the input of described first coupler receives pseudo noise code light signal to be accelerated, high speed pseudo noise code light signal after the output output speed multiplication of described first coupler.
Preferably, described full light pseudo noise code optical signal rate multiplier also comprises power equalization unit, in described power equalization unit, second coupler comprises input, output, 3rd end and the 4th end, by the 3rd end of described second coupler successively through the first wavelength division multiplexing beam splitter, semiconductor optical amplifier, Polarization Controller, second wavelength division multiplexing beam splitter, couple together with the 4th end of described first coupler, form a loop, and make described semiconductor optical amplifier be in the asymmetrical position of described loop, the high speed pseudo noise code light signal that the output that described second erbium-doped fiber amplifier receives described first coupler exports, described second wavelength division multiplexing beam splitter is given by described high speed pseudo noise code optical signal transmission, the input of described second coupler receives continuous light, the high speed pseudo noise code light signal of the output power output equilibrium of described second coupler.
Preferably, described fiber delay line comprises: optical path delayed coarse adjustment and optical path delayed fine tuning.
Preferably, described optical path delayed fine tuning comprises two parallel relative GRIN Lens, described GRIN Lens is fixed on the slide rail that can move horizontally, by the time of delay regulating the distance between described two GRIN Lens to control low speed pseudo noise code light signal in described feedback loop.
Preferably, when equaling K*T+T/2n described time of delay, wherein, T is the Cycle Length of low speed pseudo noise code light signal, and K is nonnegative number, and the speed of described low speed pseudo noise code light signal improves 2n doubly, obtains high speed pseudo noise code light signal.
Preferably, the transmission direction stating pseudo noise code light signal in the low-loss direction of isolator and described feedback loop is consistent.
Preferably, the centre wavelength of described filter is consistent with the centre wavelength of described low speed pseudo noise code light signal.
Preferably, the first described coupler and the second coupler are 2*2 coupler, and splitting ratio is 50:50.
Preferably, described first wavelength division multiplexing beam splitter and described second wavelength division multiplexing beam splitter include 3 ports: common port, transmission end and reflection end, and wherein, the centre wavelength of described reflection end is consistent with the centre wavelength of described continuous light.
Preferably, described Polarization Controller comprises tricyclic Polarization Controller, 1/2 wave plate of described tricyclic Polarization Controller is placed in the middle, quarter wave plate is arranged on two ends, is adjusted the polarization state of the high speed pseudo noise code light signal transmitted in described loop by the distance adjusted between described 1/2 wave plate and quarter wave plate.
Preferably, the pulse duration of the light signal that described second coupler exports is determined by switch window 2 △ X, and wherein △ X is the off-centered distance of described semiconductor optical amplifier in described loop.
Preferably, by regulating the multiplication factor of the second erbium-doped fiber amplifier, make high-peak power in described high speed pseudo noise code light signal to the Cross-phase Modulation of continuous light in described semiconductor optical amplifier more than π, low peak power does not reach π to the Cross-phase Modulation of continuous light in described semiconductor optical amplifier.
The technical scheme provided as can be seen from the embodiment of the invention described above, the embodiment of the present invention is by being made up of full light pseudo noise code optical signal rate multiplier rate multiplication unit and power equalization unit, rate multiplication unit passes through pseudo noise code light signal through K*T+T/2
ndelay, can by the speed of pseudo noise code light signal improve 2
ndoubly, high speed pseudo noise code light signal is obtained.Power equalization unit carries out different Cross-phase Modulations to continuous light by utilizing high-peak power, low peak power in SOA, and the peak power of high speed pseudo noise code light signal can be made balanced.
The aspect that the present invention adds and advantage will part provide in the following description, and these will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structure chart of the full light pseudo noise code optical signal rate multiplier according to one embodiment of the present invention, in figure, and isolator 101, the first erbium-doped fiber amplifier 102, fiber delay line coarse adjustment 103, fiber delay line fine tuning 104, first coupler 105;
Fig. 2 is the structure chart of the full light pseudo noise code optical signal rate multiplier according to another execution mode of the present invention, in figure, and isolator 101, first erbium-doped fiber amplifier 102, fiber delay line coarse adjustment 103, fiber delay line fine tuning 104, first coupler 105, filter 106, second wavelength division multiplexing beam splitter 107, Polarization Controller 108, SOA (semiconductor optical amplifier, Semiconductor Optical) the 109, first wavelength division multiplexing beam splitter 110, second coupler 111;
Fig. 3 is the fiber delay line fine tuning structural representation according to one embodiment of the present invention;
Fig. 4 is the Polarization Controller structural representation according to one embodiment of the present invention;
Fig. 5 A-5C is the 1Gb/s pseudo noise code light signal (waveform, frequency spectrum, eye pattern) according to one embodiment of the present invention;
Fig. 6 A-6C is 4Gb/s pseudo noise code light signal (waveform, frequency spectrum, eye pattern) before the power equalization according to one embodiment of the present invention;
Fig. 7 A-7C is 4Gb/s pseudo noise code light signal (waveform, frequency spectrum, eye pattern) after the power equalization according to one embodiment of the present invention.
Embodiment
Be described below in detail embodiments of the present invention, the example of described execution mode is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the execution mode be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
Those skilled in the art of the present technique are appreciated that unless expressly stated, and singulative used herein " ", " one ", " described " and " being somebody's turn to do " also can comprise plural form.Should be further understood that, the wording used in specification of the present invention " comprises " and refers to there is described feature, integer, step, operation, element and/or assembly, but does not get rid of and exist or add other features one or more, integer, step, operation, element, assembly and/or their group.Should be appreciated that, when we claim element to be " connected " or " coupling " to another element time, it can be directly connected or coupled to other elements, or also can there is intermediary element.In addition, " connection " used herein or " coupling " can comprise wireless connections or couple.Wording "and/or" used herein comprises one or more arbitrary unit listing item be associated and all combinations.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, and all terms used herein (comprising technical term and scientific terminology) have the meaning identical with the general understanding of the those of ordinary skill in field belonging to the present invention.Should also be understood that those terms defined in such as general dictionary should be understood to have the meaning consistent with the meaning in the context of prior art, unless and define as here, can not explain by idealized or too formal implication.
For ease of the understanding to the embodiment of the present invention, be further explained explanation below in conjunction with accompanying drawing for several specific embodiment, and each embodiment does not form the restriction to the embodiment of the present invention.
Embodiments provide a kind of fast response time, structure simple, be easy to operate, the full light pseudo noise code optical signal rate multiplier of working stability.
Extraction character based on m sequence: after PRBS being postponed T/2n, feedback is embedded in former PRBS code stream, thus the speed of PRBS is improved 2n doubly, wherein T is the Cycle Length of low speed PRBS.Therefore, can by coupler by the PRBS code stream feedback stacks of low speed in original bit stream, thus improve the speed of PRBS code stream of low speed.
According to one embodiment of the present invention, provide a kind of full light pseudo noise code optical signal rate multiplier, its structure as shown in Figure 1, comprises rate multiplication unit.
The A port of low speed pseudo noise code optical signals first coupler 105 injects, first coupler 105 comprises 2*2 coupler, it has 4 ports A, B, C, D, wherein, A port is input, and B port is output, and C port is the 3rd end, D port is the 4th end, and the splitting ratio of the first coupler 105 is 50:50.
The D port of C port connecting fiber delayer coarse adjustment 103 and fiber delay line fine tuning 104, first erbium-doped fiber amplifier 102, isolator 101, filter 106 and the first coupler 105 successively, composition feedback loop.If the time delay of this feedback loop strictly equals K*T+T/2
n(wherein T is the Cycle Length of low speed pseudo noise code light signal, and K can be any nonnegative number), the speed of low speed pseudo noise code light signal will improve 2
ntimes, thus obtain high speed pseudo noise code light signal.Connect next module by the B port of the first coupler, export high speed pseudo noise code light signal to next module.
Superposition due to peak value can cause the peak power of the RZ code of output balanced not, after rate multiplication unit, need introducing one based on the power equalization unit of TOAD (Terahertz Optical Asymmetrical Demultiplexer, WTBZterahertz optical asymmetric demultiplexer) structure.
according to another execution mode of the present invention,there is provided a kind of full light pseudo noise code optical signal rate multiplier, its structure as shown in Figure 2, comprises rate multiplication unit and power equalization unit.
In power equalization unit, second coupler 111 comprises input (F end), output (G end), 3rd end (J end) and the 4th end (H end), the J of described second coupler is held successively through the first wavelength division multiplexing beam splitter 110, SOA (semiconductor optical amplifier, Semiconductor Optical) 109, Polarization Controller 108, second wavelength division multiplexing beam splitter 107, hold with the H of described first coupler 111 and couple together, form a loop, and make described SOA109 be in the asymmetrical position of described loop, the F termination of described second coupler 111 receives continuous light, the G of described second coupler 111 holds the high speed pseudo noise code light signal of power output equilibrium.Power equalization unit based on TOAD comprises switch window 2 △ X, and △ X is the off-centered distance of SOA in ring) TOAD.TOAD is a kind of high speed full optical switching device grown up on the basis of semiconductor optical amplifier, has that structure is simple, fast response time, antijamming capability strong and is easy to the advantage such as integrated.
The high speed pseudo noise code light signal of the B port output of the first coupler 105, after the second erbium-doped fiber amplifier 106 amplifies, is transferred to the second wavelength division multiplexing beam splitter 107.Second coupler 111 comprises 2*2 coupler, and it has 4 ports F, G, H, J, and splitting ratio is 50:50.The continuous light of laser 112 inputs from the F port of the second coupler 111, by in the H port of the second coupler 111 and J port input loop, in rate multiplication unit, the B port of the first coupler 105 connects the E port of the second erbium-doped fiber amplifier 106, second wavelength division multiplexing beam splitter 107 successively, and final two-forty and the G port of pseudo noise code optical signals second coupler 111 of power equalization export.
3 ports are included: common port, transmission end and reflection end according to the first wavelength division multiplexing beam splitter 110 of one embodiment of the present invention and the second wavelength division multiplexing beam splitter 107, wherein, the centre wavelength of reflection end is consistent with laser center wavelength, and transmission end allows the output light of rate multiplication unit to pass through.
Polarization Controller 108 according to one embodiment of the present invention comprises tricyclic Polarization Controller, and its structural representation as shown in Figure 4.In Fig. 4,1/2 wave plate G of tricyclic Polarization Controller is placed in the middle, and quarter wave plate F and quarter wave plate H is respectively at two ends.Be the sheet of 50mm for diameter, the optical fiber on quarter wave plate F and quarter wave plate H need be wound around 3 circles, and on 1/2 wave plate G, optical fiber need be wound around 6 circles; Be the small pieces of 35mm for diameter, on quarter wave plate F and quarter wave plate H, optical fiber need be wound around 2 circles, and on 1/2 wave plate G, optical fiber need be wound around 4 circles.In systems in which, the polarization state in control TOAD loop ensures at the interference effect returning the second coupler 111, and 1/2 wave plate G, quarter wave plate F and quarter wave plate about H can be moved, the direction moved is: the pedestal exporting light is as far as possible little, and output waveform is stablized.
SOA109 according to one embodiment of the present invention comprises: drive circuit, temperature feedback control circuit, display circuit.The gain recovery time of SOA109 is 150ps, and bias current is 120mA.
According to fiber delay line fine tuning 104 structural representation of one embodiment of the present invention as shown in Figure 3.Fiber delay line fine tuning comprises: space optical path fine tuning structure, in this space optical path fine tuning structure, GRIN Lens 201 is fixed on fixed support 203, GRIN Lens 202 is fixed on fixed support 204, regulate the knob on fixed support 203 and fixed support 204, make on the parallel relative slide rail 205 being fixed on the space fine frame that can move horizontally of GRIN Lens 201 and GRIN Lens 202.Here first ensure when GRIN Lens 201 and GRIN Lens 202 are skid-resistant, laser loss after GRIN Lens 201 with GRIN Lens 202 is very little, when secondly also will ensure that GRIN Lens 201 and GRIN Lens 202 are slided on slide rail 205, on each position, the loss of this structure is very little and will stablize, and generally loss is below 10%.The adjustable distance △ X of GRIN Lens 201 and GRIN Lens 202
0as shown in Figure 3.By regulating the adjustable distance △ X of GRIN Lens 201 and GRIN Lens 202
0, can time of delay of feedback loop light signal.
As follows according to the experimental system course of work of one embodiment of the present invention: the A port input of low speed pseudo noise code optical signals first coupler 105, be divided into the two bundle low speed pseudo noise code light signals that power is equal, this two bundles low speed pseudo noise code light signal is respectively by B port and the output of C port of the first coupler 105, from the low speed pseudo noise code light signal ingress rate multiplication units that C port exports, from the low speed pseudo noise code light signal ingoing power balanced unit that B port exports.
The C port connecting fiber delayer of the first coupler 105, successively after coarse adjustment and fine tuning, input the first erbium-doped fiber amplifier 102 and carry out power amplification, the pump light that first erbium-doped fiber amplifier utilizes wavelength to be 980nm carries out two directional pump to Er-doped fiber, its light signal to 1550nm wave band is made to realize amplifying, and the orientation independent of amplification characteristic and signal transmission.Because the wavelength corresponding to the energy level transition of used erbium ion is 1550nm wave band, just in time correspond to the 1550nm wave band of communication, so adopt erbium-doped fiber amplifier.
First erbium-doped fiber amplifier carries out the light signal after power amplification by isolator 101, and in the low-loss direction of described isolator 101 and described feedback loop, the transmission direction of pseudo noise code light signal is consistent.Wherein the trend acting as light signal in guarantee feedback loop of isolator 101, prevents bidirectional circulating self-excitation, ensures that light signal transmits in the counterclockwise direction in the feedback loop.
The light signal that isolator 101 exports is by filter 106, and the centre wavelength of its median filter 106 is consistent with the centre wavelength of low speed pseudo noise code light signal, and working is the reflexive radiated noise of filtering first erbium-doped fiber amplifier 102, improves recurrent (impulsive) noise accumulation.The light signal that filter 106 exports returns via the D port of the first coupler 105, control lag can from the high speed pseudo noise code light signal signal after the B port output speed multiplication of the first coupler 105, and the peak power that signal now produces due to superposition reason is unbalanced.Inputted by this signal in the second erbium-doped fiber amplifier 106, due to the gain saturaition of amplifier, can partly improve power unbalanced phenomena, the output signal of the second erbium-doped fiber amplifier 106 is injected by the E port of Second Wave division multiplexer 107.
Continuous light is exported by laser 112, and its centre wavelength is different from the centre wavelength of the light signal that rate multiplication unit exports, and is inputted by the second coupler 111 port F, thus makes continuous light inject TOAD loop.In TOAD loop, continuous light is equally divided into equal clockwise (CW) light of power and counterclockwise (CCW) light, successively through SOA109 after adjusting CW light and CCW polarisation of light state by Polarization Controller 108, return 2*2 coupler 111 again, the adjustment criteria of Polarization Controller 108 is: when light does not input the E port of Second Wave division multiplexer 107, continuous light will all be returned by former road, and the G port of the second coupler 111 does not have light output.
The working method of TOAD loop is: when light does not input the E port of Second Wave division multiplexer 107, according to the transmission matrix of 2*2 coupler 108, power due to CW with CCW light is equal and to be subject to the modulation of SOA109 identical, and continuous light can be returned by its incidence end (i.e. the second coupler 111 port F port) through interfering.If now the E port of the second wavelength division multiplexing beam splitter 107 has light signal to be injected in TOAD loop, inject light can change them phase place to CCW and CW light successively generation Cross-phase Modulation and XGM, can not interfere completely thus be exported by another port when making CW light and CCW light return 2*2 second coupler 111.When injection light is a series of light pulse (as RZ code), the light signal that second coupler 111 exports also is a series of light pulses identical with controlling optical information, and its pulse duration is determined by switch window (2 △ X), wherein △ X is the off-centered distance of SOA109 in ring.Regulate the multiplication factor of the second erbium-doped fiber amplifier 106, regulate the pumping current of erbium-doped fiber amplifier, electric current increases, and erbium-doped fiber amplifier is also larger to the gain of light signal.
Make peak power that the power in power unbalanced high speed pseudo noise code light signal is higher to the Cross-phase Modulation of continuous light in SOA109 more than π, the peak power that power is lower does not reach π to the Cross-phase Modulation of continuous light in SOA109, now TOAD loop is consistent with the pattern of the pseudo noise code light signal after rate multiplication by the G port output pattern of light of the second coupler 111, and the peak power of pulse is more balanced.
For full light pseudo noise code optical signal rate multiplier, provide the specific works details of detailed this system of description of specific embodiment below:
Embodiment: will be 2 in the cycle
7the pseudorandom RZ bit rate of-1, speed 1Gb/s is multiplied to 4Gb/s.
The 1Gb/s speed that signal source as shown in figures 5a-5c produces, cycle are 2
7the pseudorandom RZ code of-1, injected by the A port of the first coupler 105, centre wavelength is 1556.1nm, and duty ratio is 10%, pulse peak power is 1.4mW, the splitting ratio of the first coupler 105 is 50:50, and the coarse adjustment of fiber delay line adopts the optical fiber group of different length, the length difference 1cm of every two optical fiber, have 20, according to the refractive index of laser in light, the delay inequality of every two optical fiber is 50ps, and maximum delay difference is 1ns.The fine tuning of fiber delay line adopts space fine shelf structure, and the Space adjustment scope of micropositioning stage is 1cm, and corresponding delay adjustable range is 30ps, it can thus be appreciated that coarse adjustment and fine tuning are together in series, can obtain the delay that precision is very high.Be experimentally K*T+T/4 (wherein T is 127ns) by the Time delay control in loop, K can be any nonnegative number, and conveniently experiment can get different value, and its occurrence meaning is very little, does not affect experiment.First erbium-doped fiber amplifier 102 is operated in linear amplification region.After 4 times of rate multiplication, the first coupler 105 port B exports the cycle is 2
7as shown in Figure 6, duty ratio is 40% to the pseudorandom RZ code of-1, speed 4Gb/s, and centre wavelength is 1556.1nm, but peak power inequality very, and maximum is about 1.2mW, and minimum value is about 0.65mW.The pseudo noise code light signal of 4Gb/s speed, after the second erbium-doped fiber amplifier 106 amplifies, is inputted by the E port of Second Wave division multiplexer 107.
Laser 112 outgoing wavelength is the continuous light of 1549.2nm, and inject TOAD loop by the F port of 2*2 second coupler 111 of 50:50, continuous light average power is about 0.5mW.Control SOA 109 departs from the size of center in ring, and making 2 Δ X be the bigoted electric current of 100ps, SOA 109 is 120mA, and carrier recovery time is about 150ps.When the pseudo noise code light signal of 4Gb/s is " 0 ", when namely not having light incident, the CW light that continuous light is divided into power equal via the second coupler 111 and CCW light, by SOA109, Polarization Controller 108, return the second coupler 111, regulate Polarization Controller 108, making CW light and CCW light getting back to generation interference in the second coupler 111, returned by the former road of input, and E port not having Laser output.When the pseudo noise code light signal of 4Gb/s is " 1 ", and pulse peak power higher time, the CW light that continuous light is divided into power equal via the second coupler 111 and CCW light, by SOA109, Polarization Controller 108, return the second coupler 111, regulate Polarization Controller 108, make CW light and CCW light get back in the second coupler 111 phase difference produced slightly larger than π, after interference, export pulse by the G port of the second coupler 111.
Fig. 6 A-6C is 4Gb/s pseudo noise code light signal (waveform before the power equalization according to one embodiment of the present invention, frequency spectrum, eye pattern), when the pseudo noise code light signal of 4Gb/s is " 1 ", and pulse peak power lower time, the CW light that continuous light is divided into power equal via the second coupler 111 and CCW light, pass through SOA109, Polarization Controller 108, return the second coupler 111, regulate Polarization Controller 108, CW light and CCW light is made to get back to the phase difference producing in the second coupler 111 and be slightly less than π, pulse is exported by the G port of the second coupler 111 after interference.Phase difference is slightly larger than π and be slightly less than π, interfere the pulse peak power value of output closely, thus realize power equalization, its Output rusults as shown in Figure 7, Fig. 7 A-7C is 4Gb/s pseudo noise code light signal (waveform, frequency spectrum, eye pattern) after the power equalization according to one embodiment of the present invention, and finally achieving the cycle is 2
7the pseudorandom RZ bit rate of-1, speed 1Gb/s is multiplied to 4Gb/s, and the peak power of pulse is more balanced.
Above-described embodiment, object of the present invention, technical scheme and beneficial effect are further described, be understood that, the foregoing is only the specific embodiment of the present invention, the present invention is applicable to the pseudo noise code rate multiplication of different cycles length, and the speed promoted is 2
n(n is positive integer), the main realization of rate multiplication completes in the rate multiplication module of such as Fig. 1, power equalization module is mainly in order to optimize output signal, if carry out power equalization by other means, such as utilize electric light absorber etc. to carry out judgement shaping to the unbalanced pseudo noise code of power, like thisly all belong to scope of the present invention.
In sum, the embodiment of the present invention is by being made up of full light pseudo noise code optical signal rate multiplier rate multiplication unit and power equalization unit, rate multiplication unit passes through pseudo noise code light signal through K*T+T/2
ndelay, can by the speed of pseudo noise code light signal improve 2
ndoubly, high speed pseudo noise code light signal is obtained.Power equalization unit carries out different Cross-phase Modulations to continuous light by utilizing high-peak power, low peak power in SOA, and the peak power of high speed pseudo noise code light signal can be made balanced.The device of the embodiment of the present invention is applicable to the pseudo noise code light signal of different cycles length, and fast response time, can integrated and integrated rear anti-interference also can increase, reach structure simple, be easy to operate, the requirement of working stability.
In the feedback speed module of the embodiment of the present invention, except the erbium-doped fiber amplifier for amplification, other are passive device, therefore the speed of this Structure adaptation can be very high, and power equalization module afterwards can be arranged in pairs or groups flexibly, in order to reach expectation function, different capacity equalizer can be adopted.
One of ordinary skill in the art will appreciate that: accompanying drawing is the schematic diagram of an embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
As seen through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add required general hardware platform by software and realizes.Based on such understanding, technical scheme of the present invention can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product can be stored in storage medium, as ROM/RAM, magnetic disc, CD etc., comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform the method described in some part of each embodiment of the present invention or embodiment.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiments.Especially, for device or system embodiment, because it is substantially similar to embodiment of the method, so describe fairly simple, relevant part illustrates see the part of embodiment of the method.Apparatus and system embodiment described above is only schematic, the wherein said unit illustrated as separating component or can may not be and physically separates, parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of module wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.Those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (12)
1. a full light pseudo noise code optical signal rate multiplier, it is characterized in that, comprise: rate multiplication unit, in described rate multiplication unit, first coupler comprises input, output, 3rd end and the 4th end, by the 3rd end of described first coupler successively through fiber delay line, first erbium-doped fiber amplifier, isolator, filter, couple together with the 4th end of described first coupler, form a feedback loop, the input of described first coupler receives pseudo noise code light signal to be accelerated, high speed pseudo noise code light signal after the output output speed multiplication of described first coupler.
2. full light pseudo noise code optical signal rate multiplier according to claim 1, it is characterized in that, described full light pseudo noise code optical signal rate multiplier also comprises power equalization unit, in described power equalization unit, second coupler comprises input, output, 3rd end and the 4th end, by the 3rd end of described second coupler successively through the first wavelength division multiplexing beam splitter, semiconductor optical amplifier, Polarization Controller, second wavelength division multiplexing beam splitter, couple together with the 4th end of described first coupler, form a loop, and make described semiconductor optical amplifier be in the asymmetrical position of described loop, the high speed pseudo noise code light signal that the output that described second erbium-doped fiber amplifier receives described first coupler exports, described second wavelength division multiplexing beam splitter is given by described high speed pseudo noise code optical signal transmission, the input of described second coupler receives continuous light, the high speed pseudo noise code light signal of the output power output equilibrium of described second coupler.
3. full light pseudo noise code optical signal rate multiplier according to claim 1, it is characterized in that, described fiber delay line comprises: optical path delayed coarse adjustment and optical path delayed fine tuning.
4. full light pseudo noise code optical signal rate multiplier according to claim 3, it is characterized in that, described optical path delayed fine tuning comprises two parallel relative GRIN Lens, described GRIN Lens is fixed on the slide rail that can move horizontally, by the time of delay regulating the distance between described two GRIN Lens to control low speed pseudo noise code light signal in described feedback loop.
5. full light pseudo noise code optical signal rate multiplier according to claim 4, is characterized in that, equal K*T+T/2 when described time of delay
ntime, wherein, T is the Cycle Length of low speed pseudo noise code light signal, and K is nonnegative number, and the speed of described low speed pseudo noise code light signal improves 2
ndoubly, high speed pseudo noise code light signal is obtained.
6. full light pseudo noise code optical signal rate multiplier according to claim 1, is characterized in that, in the low-loss direction of described isolator and described feedback loop, the transmission direction of pseudo noise code light signal is consistent.
7. full light pseudo noise code optical signal rate multiplier according to claim 1, is characterized in that, the centre wavelength of described filter is consistent with the centre wavelength of described low speed pseudo noise code light signal.
8. full light pseudo noise code optical signal rate multiplier according to claim 2, it is characterized in that, the first described coupler and the second coupler are 2*2 coupler, and splitting ratio is 50:50.
9. full light pseudo noise code optical signal rate multiplier according to claim 2, it is characterized in that, described first wavelength division multiplexing beam splitter and described second wavelength division multiplexing beam splitter include 3 ports: common port, transmission end and reflection end, wherein, the centre wavelength of described reflection end is consistent with the centre wavelength of described continuous light.
10. full light pseudo noise code optical signal rate multiplier according to claim 2, it is characterized in that, described Polarization Controller comprises tricyclic Polarization Controller, 1/2 wave plate of described tricyclic Polarization Controller is placed in the middle, quarter wave plate is arranged on two ends, is adjusted the polarization state of the high speed pseudo noise code light signal transmitted in described loop by the distance adjusted between described 1/2 wave plate and quarter wave plate.
11. full light pseudo noise code optical signal rate multipliers according to claim 2, it is characterized in that, the pulse duration of the light signal that described second coupler exports is determined by switch window 2 △ X, and wherein △ X is the off-centered distance of described semiconductor optical amplifier in described loop.
12. full light pseudo noise code optical signal rate multipliers according to claim 2, it is characterized in that, by regulating the multiplication factor of the second erbium-doped fiber amplifier, make high-peak power in described high speed pseudo noise code light signal to the Cross-phase Modulation of continuous light in described semiconductor optical amplifier more than π, low peak power does not reach π to the Cross-phase Modulation of continuous light in described semiconductor optical amplifier.
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| WO2009027900A1 (en) * | 2007-08-24 | 2009-03-05 | Koninklijke Philips Electronics N.V. | Pseudo-noise transmission system with direct feed-through cancellation |
| US20090273821A1 (en) * | 2005-09-28 | 2009-11-05 | Alcatel-Lucent Usa Inc. | All-optical methods and systems |
| US20110002696A1 (en) * | 2005-09-28 | 2011-01-06 | Alcatel-Lucent Usa | All-optical methods and systems |
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| US20090273821A1 (en) * | 2005-09-28 | 2009-11-05 | Alcatel-Lucent Usa Inc. | All-optical methods and systems |
| US20110002696A1 (en) * | 2005-09-28 | 2011-01-06 | Alcatel-Lucent Usa | All-optical methods and systems |
| WO2009027900A1 (en) * | 2007-08-24 | 2009-03-05 | Koninklijke Philips Electronics N.V. | Pseudo-noise transmission system with direct feed-through cancellation |
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