CN104883629A - Apparatus and method for generating spectral amplitude code label by using adjustable optical filter - Google Patents
Apparatus and method for generating spectral amplitude code label by using adjustable optical filter Download PDFInfo
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Abstract
The invention discloses an apparatus and method for generating a spectral amplitude code label by using an adjustable optical filter and belongs to the technical field of optical communication. The apparatus comprises a frequency-sweeping laser source generating device, the adjustable optical filter, and an electro-optical modulator. The frequency-sweeping laser source generating device generates a frequency-sweeping laser source with constant power and operating frequency linearly varying with time and inputs the frequency-sweeping laser source into the adjustable optical filter. The frequency sweeping velocity of the frequency-sweeping laser source is consistent with electric label signal rate. The adjustable optical filter performs frequency selection on the frequency-sweeping laser source according to a preset frequency interval so as to obtain a SAC initial light source and input the SAC initial light source into the electro-optical modulator. The electro-optical modulator generates a SAC optical label signal after performing electric label signal modulation on the SAC initial light source. The method comprises: generating a frequency-sweeping laser source with constant power and operating frequency linearly varying with time based on the electric label signal; performing frequency selection on the frequency-sweeping laser source according to the preset frequency interval so as to obtain the SAC initial light source and then generating the SAC optical label signal based on same. The apparatus and the method are used by an optical label exchange system and are low in complexity and high in transmission rate.
Description
Technical field
The present invention relates to a kind of technical field of photo communication, be specifically related to a kind of apparatus and method utilizing tunable optical filter to produce spectrum amplitude code labeling.
Background technology
Along with the fast development of Internet service, the explosive growth of IP data volume and traffic carrying capacity is had higher requirement to communication network.Although the transmission capacity of optical communication backbone network has reached Tb/s magnitude at present, as a part indispensable in optical communication net---switching node, still need to carry out light/electrical/optical conversion and electrical domain process to packet.Because electron exchange and electric information processing rate reach capacity, this constrains the transmission speed of existing communication network greatly, causes " electronic bottleneck " of data processing and transmission.This rate signal causing optical wavelength channel link to carry needs to carry out rate-matched at switching node place, and then cause switching node to become the bottleneck of whole communication network, a large amount of light between two subnets/electrical interface adaptation and rate adaptation operating reduce network resource utilization, reduce network performance and efficiency, add network cost.For addressing this problem, there has been proposed signal and exchange (OLS, Optical Label Switching) technology, to breaking away from the dependence to electric treatment at network core Nodes, realization can carry out all optical network (AON, All-Optical Network) of All-optical switching and full light process to information.In all optical network, information transfers to the process of receiving node from sending node, exists all the time with the form of light signal, without the need to opto-electronic conversion, thus significantly promotes network performance.
Along with going deep into Optical Code Division Multiplexing (OCDM, Optical Code Division Multiplexing) technical research, the concept of light code (OC:Optical Code) is progressively extended in signal exchange field.As a up-to-date optical mark switching technique, the sharpest edges of OC labelling technique are: based on the coding/decoding principle in OCDM technology, at the core node place of signal switching system, all-optical correlators is utilized to identify OC mark, and use photo threshold decision device and optically controlled optical switch to complete forwarding to payload, thus thoroughly can break away from the light/electrical/optical transfer process at signal switching system core node place, realize real All-optical switching in theory.
At present, in OCDM technology and OC label switched system, existing Multi-encoding mode is available.Spectrum amplitude code (SAC, Spectral Amplitude Code) then as a kind of one dimension Frequency Domain Coding mode, simple by means of its operation principle, system complexity is low, mark generates and identifies the advantages such as easily realization, caused the concern of numerous researcher, the multiple new pattern based on SAC coded system is also proposed successively, and is being widely used in OC label switched system.As shown in Figure 1, current common spectrum amplitude code labeling encoder comprises multi-frequency laser array, tag encoder, 2 wave multiplexers and 1 channel-splitting filter, wherein tag encoder is by channel-splitting filter and optical band pass filter (OBPF, Optical Band-pass Filter) array formation, the quantity of multi-frequency laser is consistent with OBPF quantity, for 4 lasers and 4 OBPF in Fig. 1.Its implementation procedure is: multi-frequency laser array produces f
1~ f
4, 4 road light sources of totally 4 frequencies, 4 road light sources, after wave multiplexer, synthesize 1 tunnel and contain 4 frequency (f
1~ f
4) multi-frequency light source; Multi-frequency light source input marking encoder, is divided into 4 tunnels through channel-splitting filter, and every road all comprises 4 frequencies.Now, 4 road multi-frequency light beam input OBPF arrays.In OBPF array, the centre frequency of each OBPF, by the flag code needed for system, presets, to obtain required spectrum amplitude code labeling.4 tunnels of last OBPF export and enter wave multiplexer again and carry out conjunctions ripple, band contains the SAC optical label signal of 1 ~ 4 frequency.
Because SAC code is a kind of one dimension Frequency Domain Coding mode, therefore, in the mark maker of SAC optical label signal switching system and SAC-OCDM system, need to use the laser array or the wideband light source that are operated in different frequency, produce multi-frequency SAC signal.This causes SAC optical label signal switching system to there is the shortcomings such as marker recognition cellular construction is too complicated, label bit-rate cannot be increased to Gb/s all the time, realize high cost, splitting loss is excessive, system bearing payload rates is too low, payload modulation mode is single.
Summary of the invention
Goal of the invention of the present invention is: for above-mentioned Problems existing, provides generation device and the method for the spectrum amplitude code labeling that a kind of complexity is low, transmission rate is high.
A kind of device utilizing tunable optical filter to produce spectrum amplitude code labeling of the present invention, using the IP packet routing information from Access Network as electric marking signal, described electric marking signal is input in spectrum amplitude code labeling SAC optical label signal maker, generate SAC optical label signal, this SAC optical label signal maker comprises frequency-sweeping laser source generating apparatus, tunable optical filter and electrooptic modulator, wherein, frequency-sweeping laser source generating apparatus, for generation of power invariability, (sweep velocity is consistent with the transmission rate of described IP packet routing information for the frequency-sweeping laser source that operating frequency changes linearly over time, namely sweep velocity equals electric marking signal speed) and export tunable optical filter to, tunable optical filter, for carrying out He Ne laser according to predeterminated frequency interval delta f to frequency-sweeping laser source, generating power is constant, frequency changes in time and frequency interval is the SAC pulse signal of Δ f, i.e. SAC primary light source, and exports SAC primary light source to electrooptic modulator, electrooptic modulator, inputs electric marking signal and SAC primary light source, exports SAC optical label signal, namely carries out electrooptic modulation based on electric marking signal to SAC primary light source, generates SAC optical label signal.
In said apparatus of the present invention, by adjusting the swept frequency range of frequency-sweeping laser source, the whole usable frequencies covering multi-frequency SAC can be realized, and the speed of SAC optical label signal depends on the frequency number N in frequency sweep cycle T set by frequency-sweeping laser source and frequency sweep cycle T shared by SAC optical label signal, and namely the speed of SAC optical label signal is N/T (b/s).Therefore, the present invention effectively improves the flexibility of SAC optical label signal coding and transmission rate.
Further, frequency-sweeping laser source generating apparatus of the present invention comprises laser, sawtooth waveforms function generator and light frequency modulation device: wherein laser exports light frequency modulation device to for generation of frequency laser light source; Sawtooth waveforms function generator is for generation of the sawtooth waveforms function signal of telecommunication identical with the transmission rate of described IP packet routing information and export light frequency modulation device to; Light frequency modulation device, based on frequency laser light source and sawtooth waveforms function signal of telecommunication generating power constant, the frequency-sweeping laser source that operating frequency changes linearly over time.Thus make the present invention in the generative process of SAC optical label signal, only need a laser and a tunable optical filter to complete, therefore significantly reduce the system complexity of existing SAC encoder and realize cost.
Meanwhile, the invention also discloses a kind of method utilizing tunable optical filter to produce spectrum amplitude code labeling, comprise the following steps:
Using the IP packet routing information from Access Network as electric marking signal; The frequency-sweeping laser source that generating power is constant, operating frequency changes linearly over time, and the sweep velocity of frequency-sweeping laser source is consistent with electric marking signal speed; According to predeterminated frequency interval, He Ne laser is carried out to frequency-sweeping laser source, obtain spectrum amplitude code labeling SAC primary light source; Based on electric marking signal, electrooptic modulation is carried out to SAC primary light source, generate SAC optical label signal.
Further, generating frequency-sweeping laser source is: carry out light frequency modulation, the frequency-sweeping laser source that generating power is constant, operating frequency changes linearly over time by with the sawtooth waveforms of described IP packet routing information identical traffic speed, frequency laser light source.Thus make the present invention in the generative process of SAC optical label signal, only need a laser and a tunable optical filter to complete, therefore significantly reduce the system complexity of existing SAC encoder and realize cost.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows: the flexibility that effectively improve SAC optical label signal coding and transmission rate, and therefore significantly reduce the system complexity of existing SAC encoder and realize cost.
Accompanying drawing explanation
Fig. 1 is existing spectrum amplitude code labeling coder structure schematic diagram;
Fig. 2 is existing Fabry-Perot tunable optical filter structural diagrams intention;
Fig. 3 is in embodiment, utilizes Fabry-Perot tunable optical filter to generate the principle schematic of multi-frequency SAC optical label signal;
Fig. 4 is in the specific embodiment of the invention, frequency-sweeping laser source generating apparatus structural representation;
Fig. 5 is in the specific embodiment of the invention, the frequency variation curve of frequency-sweeping laser source;
Fig. 6 is in the specific embodiment of the invention, produces the apparatus structure schematic diagram of multi-frequency SAC optical label signal;
Fig. 7 is in the specific embodiment of the invention, the SAC pulse signal spectrogram of generation;
Fig. 8 is in the specific embodiment of the invention, the SAC optical label signal spectrogram of generation;
Fig. 9 is in the specific embodiment of the invention, the SAC optical label signal time domain beamformer of generation.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with execution mode and accompanying drawing, the present invention is described in further detail.
In this embodiment, tunable optical filter adopts Fabry-Perot tunable filter.With reference to Fig. 1, Fabry-Perot tunable filter is the optical resonator be made up of two pieces of semi-transparent semi-reflecting parallel reflective mirrors (interior plating high-reflecting film), after incident light enters optical resonator, do multiple reflections between two minute surfaces after, export (emergent light).By adjusting mirror interplanar distance L, according to formula 2L=mc/f, (wherein c is the light velocity, f is light frequency, m=1,2,3...) select the light of a certain frequency to pass through, realize adjustable filtering, other frequency component is then blocked, and wherein the adjustment of minute surface distance is both by the change of direct mobile minute surface machinery, also indirectly changes by changing material refractive index in chamber.At present, lithium acid niobium (LiNbO
3) the narrowest filtering bandwidth of Fabry-Perot tunable optical filter can reach 2GHz, tuned speed is more than 1Gb/s, and adjustable extent is at more than 50nm.
Based on the selecting frequency characteristic of Fabry-Perot tunable optical filter, this filter and frequency swept laser is utilized to generate the operation principle of multi-frequency SAC optical label signal as shown in Figure 3:
First use sawtooth waveforms function generator to produce sawtooth waveforms function signal and carry out frequency modulation(FM) to frequency laser light source, generating power is constant, the time dependent frequency-sweeping laser source of operating frequency (as shown in Fig. 3-a), wherein swept frequency range f
swept=f
n-f
1(f
nrepresent the maximum in swept frequency range, f
1represent reckling in swept frequency range), frequency sweep cycle is T; Subsequently, this frequency-sweeping laser source is after the Fabry-Perot tunable optical filter frequency-selecting that frequency interval is Δ f, generating power is constant, frequency becomes in time and the SAC pulse signal (as shown in Fig. 3-b) that frequency interval is Δ f, i.e. SAC primary light source.Wherein Δ f=f
swept/ N, N are system parameters, represent in the frequency sweep cycle T of frequency-sweeping laser source, the frequency number shared by SAC optical label signal; After the electroactive marker signal (as shown in Fig. 3-c) that the SAC pulse that frequency interval is Δ f is N/T b/s through speed carries out electrooptic modulation, the SAC optical label signal (as shown in Fig. 3-d) that generating rate is N/T b/s.
With reference to Fig. 4, in this embodiment, by distributed feed-back (DFB, Distributed Feedback) laser, sawtooth waveforms function generator and light frequency modulation device form frequency-sweeping laser source generating apparatus of the present invention: according to the speed of electric marking signal (the IP packet routing information from Access Network), speed (identical with electric marking signal speed) and the frequency sweep cycle of the sawtooth waveforms function signal that sawtooth waveforms function generator produces are set, arranging frequency sweep cycle in present embodiment is 12.8ns (or 78MHz), based on above-mentioned setting, produce sawtooth waveforms function signal and export light frequency modulation device to, Distributed Feedback Laser is for generation of frequency laser light source, and the SAC optical label signal frequency range according to the present embodiment, its operating frequency is set as 193.05THz herein.Sawtooth waveforms function signal and frequency laser light source (local oscillator light signal) are after light frequency modulation device is modulated, get final product generating power constant, the frequency-sweeping laser source (frequency sweep local oscillator light source) that operating frequency changes linearly over time, the swept frequency range of this frequency-sweeping laser source is 193.05THz ~ 193.082THz, thus obtains swept frequency range f
swept=(193.082-193.05) THz=32GHz.The operating frequency curve over time of this frequency-sweeping laser source is shown in Fig. 5.
Based on foregoing description, in the present embodiment, produce the device of multi-frequency SAC optical label signal namely by Distributed Feedback Laser, sawtooth waveforms function generator, light frequency modulation device, Fabry-Perot tunable optical filter and Mach-Zehnder modulator are formed, with reference to Fig. 6, by Distributed Feedback Laser, sawtooth waveforms function generator and light frequency modulation device generate frequency-sweeping laser source as shown in Figure 5, carry out after He Ne laser through Fabry-Perot tunable optical filter again, the SAC primary light source as shown in Fig. 3-b can be obtained, electricity marking signal (the IP packet routing information from Access Network) and SAC primary light source (load on SAC primary light source by electric marking signal carry out photoelectricity modulation in Mach-Zehnder modulator after, and intensity modulated is carried out to SAC primary light source), generate and export multi-frequency SAC optical label signal.
At f
sweptwhen the frequency-sweeping laser source of=32GHz enters Fabry-Perot tunable optical filter, based on preset frequency interval be Δ f=2GHz, so in 12.8ns (frequency sweep cycle) time window, by generation 16 SAC pulses, now corresponding SAC optical label signal speed is 1.25Gb/s (as shown in Figure 7); The sequence length that SAC pulse and Random Digital Signal Generator produce is 2
7the electric marking signal of the 1.25Gb/s of-1, after Mach-Zehnder modulator modulation, generates the SAC optical label signal of 16 frequencies.The frequency domain of the SAC optical label signal of 16 frequencies and time domain beamformer are respectively as shown in Fig. 8 and Fig. 9.
To sum up, the SAC optical label signal that the present invention utilizes tunable optical filter and frequency-sweeping laser source to generate, the flexibility of SAC optical label signal switching system coding and label bit-rate can be significantly improved, simplify existing SAC coder structure, significantly improve label bit-rate, implement simple, easy simultaneously, there is actual operability.
The above, be only the specific embodiment of the present invention, arbitrary feature disclosed in this specification, unless specifically stated otherwise, all can be replaced by other equivalences or the alternative features with similar object; Step in disclosed all features or all methods or process, except mutually exclusive feature and/or step, all can be combined in any way.
Claims (7)
1. utilize tunable optical filter to produce a device for spectrum amplitude code labeling, using the IP packet routing information from Access Network as electric marking signal, it is characterized in that, comprise frequency-sweeping laser source generating apparatus, tunable optical filter and electrooptic modulator,
Frequency-sweeping laser source generating apparatus, the frequency-sweeping laser source changed linearly over time for generation of power invariability, operating frequency also exports tunable optical filter to, and wherein the sweep velocity of frequency-sweeping laser source is consistent with electric marking signal speed;
Tunable optical filter, for carrying out He Ne laser according to predeterminated frequency interval to frequency-sweeping laser source, obtaining spectrum amplitude code labeling SAC primary light source, and exporting SAC primary light source to electrooptic modulator;
Electrooptic modulator, carries out electrooptic modulation based on electric marking signal to SAC primary light source, generates SAC optical label signal.
2. device as claimed in claim 1, it is characterized in that, described frequency-sweeping laser source generating apparatus comprises laser, sawtooth waveforms function generator and light frequency modulation device,
Laser, exports light frequency modulation device to for generation of frequency laser light source;
Sawtooth waveforms function generator, exports light frequency modulation device to for generation of the sawtooth waveforms function signal of telecommunication identical with the transmission rate of described IP packet routing information;
Light frequency modulation device, based on frequency laser light source and sawtooth waveforms function signal of telecommunication generating power constant, the frequency-sweeping laser source that operating frequency changes linearly over time.
3. device as claimed in claim 2, it is characterized in that, described laser is distributed feed-back Distributed Feedback Laser.
4. the device as described in claim 1,2 or 3, is characterized in that, described tunable optical filter is Fabry-Perot tunable optical filter.
5. the device as described in claim 1,2 or 3, is characterized in that, described electrooptic modulator is Mach-Zehnder modulator.
6. utilize tunable optical filter to produce a method for spectrum amplitude code labeling, it is characterized in that, comprise the following steps:
Using the IP packet routing information from Access Network as electric marking signal;
The frequency-sweeping laser source that generating power is constant, operating frequency changes linearly over time, and the sweep velocity of frequency-sweeping laser source is consistent with electric marking signal speed;
According to predeterminated frequency interval, He Ne laser is carried out to frequency-sweeping laser source, obtain spectrum amplitude code labeling SAC primary light source;
Based on electric marking signal, electrooptic modulation is carried out to SAC primary light source, generate SAC optical label signal.
7. method as claimed in claim 6, it is characterized in that, generation frequency-sweeping laser source is: carry out light frequency modulation, the frequency-sweeping laser source that generating power is constant, operating frequency changes linearly over time by with the sawtooth waveforms of described IP packet routing information identical traffic speed, frequency laser light source.
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| CN114636704A (en) * | 2022-03-10 | 2022-06-17 | 电子科技大学 | Terahertz continuous wave three-dimensional tomography method based on deep learning |
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Application publication date: 20150902 |