CN212064016U - Optical pulse signal positive and negative code encoding system based on time lens imaging - Google Patents
Optical pulse signal positive and negative code encoding system based on time lens imaging Download PDFInfo
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Abstract
An optical pulse signal positive and negative code coding system based on time lens imaging comprises a judgment subsystem, a code expansion subsystem, a time lens imaging inversion subsystem A, a code reduction subsystem, a time lens imaging inversion subsystem B and a synchronization subsystem, the output end of the judgment subsystem is respectively connected with the input end of the code expanding subsystem and the input ends of the time lens imaging inversion subsystem A and the time lens imaging inversion subsystem B, the output end of the code spreading subsystem is connected with the input end of the time lens imaging inversion subsystem A, the output end of the time lens imaging inversion subsystem A is connected with the input end of the code reduction subsystem, the output end of the code reduction subsystem is connected with the input end of the time lens imaging inversion subsystem B, and the output end of the time lens imaging inversion subsystem B is connected with the input end of the synchronization subsystem. The utility model discloses the system simple structure, the coding efficiency is high, and the arithmetic rate is fast, provides new scheme for optical signal's error correction coding technique.
Description
Technical Field
The utility model relates to a positive and negative code coding system of optical pulse signal based on time lens formation of image.
Background
Forward Error Correction (FEC) technology is widely used in optical communication systems to achieve the purposes of improving the error rate performance of the system, improving the reliability of system communication, extending the transmission distance of optical signals, reducing the transmission power of an optical transmitter, and reducing the system cost. The positive and negative code is a relatively simple error control code in forward error correction techniques, in which the number of parity bits is the same as the number of information bits, the parity bits are simple repetitions of the information bits when the information bits have an odd number of "1" s, and the parity bits are the inverse of the information bits when the information bits have an even number of "1" s. And the receiving end can judge and correct the error code according to the information bit and the supervision bit of the positive and negative codes.
The time lens is an optical device capable of generating a secondary time phase shift on an optical signal, and is used for signal processing in the field of optical communication, and a four-wave mixing (FWM) is preferably used for realizing the time lens effect. Electric field amplitude of Es(t) and Ep(t) the signal light and the pump light have FWM effect, and the generated idle wave electric field amplitude
Idle light EidlerWith respect to the input signal light EsThe second order phase shift is introduced, which is the basic principle of FWM to produce temporal lensing.
The input section of the optical fiber (the second-order dispersion is phi ″)1＝β2sLs) Time lens (focal length dispersion phi ″)f＝-φ″p/2＝-β2pLp/2) and output section optical fiber (second-order dispersion is phi ″)2＝β2iLi) The three parts form a time lens imaging system. The dispersion of the front and rear optical fibers is phi ″', respectively1＝β2sLs，φ″2＝β2iLiThe focal length dispersion of the time lens is determined entirely by the dispersion experienced by the pump light, phi ″f＝-φ″p/2＝-β2pLp/2，β2s、β2iSecond order dispersion coefficients, beta, of two sections of optical fiber2pIs the second order dispersion coefficient of the pump light transmission fiber; l iss、LiRespectively the lengths of the front and rear sections of optical fibre, LpIs the length of fiber that the pump light undergoes dispersion broadening. When the second-order dispersion phi of the two optical fibers1、φ″2Focal length dispersion phi' with time lensfSatisfies the imaging condition
Then, the amplification or compression of the input optical signal can be realized, wherein the amplification factor M ═ phi ″ "2/φ″1。
Disclosure of Invention
In order to overcome the not enough of the system performance decline that leads to because factors such as optical fiber loss, chromatic dispersion, nonlinear effect in long distance optical communication system, the utility model provides a novel optical pulse signal positive and negative code encoding system based on time lens formation of image, as a forward error correction coding technique, this system not only is simple relatively, effective at the system structure, has also expanded the implementation mode of error correction coding in the current optical communication technique.
In order to solve the technical problem the utility model discloses a technical scheme is:
the optical pulse signal positive and negative code coding system based on time lens imaging comprises a judging subsystem, a code expanding subsystem, a time lens imaging inversion subsystem A, a code shrinking subsystem, a time lens imaging inversion subsystem B and a synchronizing subsystem, wherein the output end of the judging subsystem is respectively connected with the input end of the code expanding subsystem and the input end of the time lens imaging inversion subsystem A, B, the output end of the code expanding subsystem is connected with the input end of the time lens imaging inversion subsystem A, the output end of the time lens imaging inversion subsystem A is connected with the input end of the code shrinking subsystem, the output end of the code shrinking subsystem is connected with the input end of the time lens imaging inversion subsystem B, and the output end of the time lens imaging inversion subsystem B is connected with the input end of the synchronizing subsystem.
In the judgment subsystem, the parity of the number of '1' in the pulse signal, namely the information bit, is judged, if the number is an even number, the signal time reversal of the time lens imaging inversion subsystem A, B is carried out, and if the number is an odd number, the signal time reversal of the time lens imaging inversion subsystems A and B is not carried out; the code spreading subsystem converts a single code of the pulse signal into a double code, so that N information bits are converted into 2N optical signals; in the time lens imaging inversion subsystem A, time inversion of the pulse signals after code spreading is realized through the magnification factor of-1 times; in the code reduction subsystem, double codes are converted back into single codes again, so that 2N-bit input signals are converted into N-bit output signals; in the time lens imaging inversion subsystem B, the input pulse signal is similarly inverted again by the magnification factor of-1 times, and at this time, the N-bit pulse signal generated by inversion is the inverse code (supervisory code) corresponding to the original pulse signal (information bit); and in the synchronization module, the generated supervision bit and the information bit are synchronized and then output to generate a positive code and a negative code.
The utility model discloses under the effect of the positive and negative code coding system of optical pulse signal, realize according to input pulse signal the parity generation of "1" number in the information bit promptly and correspond the function of supervise the position, wherein when "1" number is the odd number, supervise the position and be former information bit, when "1" is the even number, supervise the position and be the anti-code of "value" of information bit, further generate and correspond positive and negative code, realized pulse signal's positive and negative code coding promptly.
Furthermore, the time lens imaging inversion subsystem is composed of an input section optical fiber, a time lens and an output section optical fiber, and the second-order dispersion phi of the output section optical fiber2Second-order dispersion phi' with the input section optical fiber1In contrast, i.e., "phi2＝-φ″1(ii) a Magnification M ═ phi ″' of the time lens imaging subsystem A, B2/φ″1And (1), covering the corresponding input optical pulse signals respectively during the duration of the pump optical pulse of the time lens imaging subsystem, and realizing the inversion function of the signal optical pulse through M-1.
Still further, in the time lens imaging inversion subsystem a and the time lens imaging inversion subsystem B, the FWM occurs in the high nonlinear fiber by the signal light and the pump light to realize the time lens effect.
Or the following steps: the time lens effect is realized by FWM of signal light and pump light in a highly nonlinear medium.
Preferably, the width of the pump light pulse is controlled, and one pump light pulse width can cover twice the time length of the original light pulse signal in the time lens imaging subsystem a, so that the reversal of the code-spread signal is realized. And in the time lens imaging subsystem B, one pumping light pulse width can cover the time length of the original light pulse signal, so that the reversal of the code-reduced signal is realized.
Furthermore, in the code expanding subsystem, a single code is converted into a double code, namely, 1 is converted into 10, and 0 is converted into 01; in the code reduction subsystem, double codes are changed back to single codes, namely that '01' is changed into '0' and '10' is changed into '1'. Other conversion schemes between single and double codes may also be used.
Furthermore, in the time lens imaging inversion subsystem a and the time lens imaging inversion subsystem B, inversion of subsystem input pulse signals is realized, i.e., "110" is converted into "011", and "011" is converted into "110". Other inversion schemes may also be used.
The technical conception of the utility model is as follows: firstly, in the optical pulse judgment subsystem, the number of odd and even numbers of '1' is judged for the input continuous optical pulse signals, if the number of the odd numbers is '100', the signals do not change after passing through the subsequent subsystem, namely the obtained supervision bit is still '100', and finally the output positive and negative codes are '100100'; if the number of the even numbers is '110', the signals are converted to generate supervision bits after entering subsequent subsystems such as spreading codes and the like; converting '1' into '10' and '0' into '01' in the code spreading subsystem, and then converting '110' into '101001'; in the time lens imaging inversion subsystem A, when phi ″)2＝-φ″1When the amplification factor M is-1, the pumping light pulse width can cover twice of the original light signal pulse width, and at this time, the time inversion is realized after the continuous pulse signal passes through the time lens imaging system a, namely, the conversion from "101001" to "100101"(ii) a Then, the dual signals are returned to the single signals through the code reduction subsystem, namely, the 01 is restored to the 0, the 10 is restored to the 1, and the code expansion signal 100101 is converted to the 100; in the time lens imaging inversion subsystem B, when phi ″)2＝-φ″1When the amplification factor M is-1, the original optical signal pulse width which can be covered by the pump optical pulse width is allowed, the time inversion is realized again after the input code reduction signal passes through the time lens imaging system B, the input code reduction signal '100' converts the supervision bit '001', and the positive and negative codes '110001' are output after synchronization. After the conversion of the whole system, the optical pulse signal is coded by the positive and negative codes, and a novel implementation scheme is provided for coding the positive and negative codes of the optical pulse signal based on the inversion characteristic of the time lens imaging system and four subsystems of judgment, code expansion, code contraction and synchronization.
The beneficial effects of the utility model are embodied in: after the optical signal passes through the judgment subsystem, the code expansion subsystem, the time lens imaging inversion system A, the code reduction subsystem, the time lens imaging inversion system B and the synchronization subsystem, the function of generating a positive code and a negative code according to the input optical signal can be realized.
Drawings
Fig. 1 is the system diagram of the present invention, which includes, a judgment subsystem, a code expansion subsystem, a time lens imaging inversion subsystem a, a code reduction subsystem, a time lens imaging inversion subsystem B and a synchronization sub-module.
Fig. 2 is a schematic diagram of time-lens inversion, where a pair of optical pulses obtains time-wise inversion when the magnification M is-1, where 1 is input dispersion, 2 is pump light, and 3 is output dispersion.
Fig. 3 is a schematic diagram of inversion of a continuous optical pulse signal (101001) after spreading a code of an original signal (110) with a pulse width of 5ps by a time lens imaging subsystem a, wherein (a) is an input signal (101001); (b) is the output signal (100101).
FIG. 4 is a schematic diagram of the inversion of the transcoded continuous optical pulse signal (100) having a pulse width of 5ps through the time-lens imaging subsystem B, where (a) is the input signal (100); (b) is the output signal (001).
Detailed Description
The present invention will be further described with reference to the following embodiments, but the scope of the present invention is not limited thereto.
Referring to fig. 1 to 4, a light pulse signal positive and negative code encoding system based on time lens imaging includes a judgment subsystem, a code expansion subsystem, a time lens imaging inversion subsystem A, B, a code reduction subsystem, and a synchronization sub-module; the judgment subsystem can achieve the function of controlling the operation of the imaging inversion subsystem by using simple modes such as controlling the input of pump light of the time lens imaging inversion subsystem by using an optical switch; the code spreading subsystem converts 1 into 10 and 0 into 01 to realize the function of spreading the whole optical pulse signal, and the method is very common in the current signal processing and communication fields, so the implementation process is not repeated; the time lens imaging inversion subsystem A, B is composed of an input section optical fiber, a time lens and an output section optical fiber, and the second-order dispersion phi' of the output section optical fiber2Second-order dispersion phi' with the input section optical fiber1In contrast, i.e., "phi2＝-φ″1(ii) a The magnification M ═ phi ″' of the time lens imaging subsystem2/φ″1-1; controlling the width of the pump light pulse to enable the duration of the subsystem A to cover twice the width of the original signal light pulse, ensuring that the code-spread light pulse can be inverted, and enabling the duration of the subsystem B to only cover the width of the original signal light pulse; the code reduction subsystem converts the double codes into the single codes, namely 01 is converted into 0, and 10 is converted into 1, which is similar to the code expansion, and the implementation process is not repeated here; the synchronization module can implement a synchronization function by an optical signal delay method, and a specific implementation process is not described herein again.
In the time lens imaging inversion subsystem, the FWM of signal light and pump light occurs in a high nonlinear optical fiber to realize the time lens effect. Or the following steps: the time lens effect is realized by FWM of signal light and pump light in a highly nonlinear medium. Preferably, the pump light pulse width is controlled such that one pump light pulse width can cover the input light pulse signal width, thereby achieving inversion of the optical signal.
Referring to FIG. 2, to satisfy
The parameters of both temporal lens imaging subsystems are selected as: beta is a2s＝20ps2/km，Ls＝1km，β2i＝-20ps2/km，Li＝1km，β2p＝20ps2/km，Lp1 km. At this time, phi ″)2＝-φ″1，M＝-1。
FIG. 3 shows a pulse width T0The optical pulse signal 101001(Input) after being spread with 5ps code is converted into 100101(Output) after passing through the time-lens imaging inversion subsystem.
FIG. 4 shows a pulse width T0The 5ps encoded optical pulse signal 100(Input) is transformed into the generated supervisory code 001(Output) after passing through the time-lens imaging inversion subsystem.
As described above with reference to fig. 1 to 4, the optical pulse signal 110 is converted to 001 after being subjected to systematic conversion, and a function of generating a parity bit corresponding to the positive and negative codes from the parity of the number of pulse signals "1" is realized. In the above embodiment, the signal processing rate can be increased by shortening the input optical pulse width, the system has good performance, and the corresponding supervisory bits and the positive and negative codes of the continuous input optical pulse signal can be effectively generated, i.e., the positive and negative code encoding is realized.
Claims (7)
1. An optical pulse signal positive and negative code coding system based on time lens imaging is characterized by comprising a judgment subsystem, a code expansion subsystem, a time lens imaging inversion subsystem A, a code reduction subsystem, a time lens imaging inversion subsystem B and a synchronization subsystem, the output end of the judgment subsystem is respectively connected with the input end of the code expanding subsystem and the input ends of the time lens imaging inversion subsystem A and the time lens imaging inversion subsystem B, the output end of the code spreading subsystem is connected with the input end of the time lens imaging inversion subsystem A, the output end of the time lens imaging inversion subsystem A is connected with the input end of the code reduction subsystem, the output end of the code reduction subsystem is connected with the input end of the time lens imaging inversion subsystem B, and the output end of the time lens imaging inversion subsystem B is connected with the input end of the synchronization subsystem.
2. The system of claim 1, wherein the time lens imaging inversion subsystem A and the time lens imaging inversion subsystem B are composed of an input optical fiber, a time lens and an output optical fiber, and the second-order dispersion phi' of the output optical fiber2Second-order dispersion phi' with the input section optical fiber1In contrast, i.e., "phi2＝-φ″1(ii) a The magnification M ═ phi ″' of the time lens imaging subsystem2/φ″1When the pump light pulse duration of the time lens imaging subsystem is-1, the input light pulse signal needs to be covered, and the inversion of the input signal light is realized through M-1, that is, the inversion function is realized.
3. A time-lens imaging based optical pulse signal positive-negative code encoding system as claimed in claim 1 or 2, wherein: in the time lens imaging inversion subsystem A and the time lens imaging inversion subsystem B, the FWM of the signal light and the pump light in the high nonlinear optical fiber is used for realizing the time lens effect.
4. A time-lens imaging based optical pulse signal positive-negative code encoding system as claimed in claim 1 or 2, wherein: in the time lens imaging inversion subsystem A and the time lens imaging inversion subsystem B, the FWM of the signal light and the pump light in a high nonlinear medium is used for realizing the time lens effect.
5. A time-lens imaging based optical pulse signal positive-negative code encoding system as claimed in claim 1 or 2, characterized in that: in the time lens imaging inversion subsystem A and the time lens imaging inversion subsystem B, the pulse width of each pump light is controlled, so that one pump light pulse width can cover the width of the pulse signal light input by each subsystem.
6. A time-lens imaging based optical pulse signal positive-negative code encoding system as claimed in claim 1 or 2, characterized in that: in the code spreading subsystem, a single code is converted into a double code, namely, a 1 is converted into a 10, and a 0 is converted into a 01; in the code reduction subsystem, double codes are changed back to single codes, namely that '01' is changed into '0' and '10' is changed into '1'.
7. A time-lens imaging based optical pulse signal positive-negative code encoding system as claimed in claim 1 or 2, characterized in that: in the time lens imaging inversion subsystem A and the time lens imaging inversion subsystem B, inversion of subsystem input pulse signals is realized, namely, 110 is converted into 011, and 011 is converted into 110.
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