WO2007104182A1 - Système de transmission optique destiné à corriger la distorsion de signal dans le domaine temps-fréquence et procédé associé - Google Patents

Système de transmission optique destiné à corriger la distorsion de signal dans le domaine temps-fréquence et procédé associé Download PDF

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Publication number
WO2007104182A1
WO2007104182A1 PCT/CN2006/000383 CN2006000383W WO2007104182A1 WO 2007104182 A1 WO2007104182 A1 WO 2007104182A1 CN 2006000383 W CN2006000383 W CN 2006000383W WO 2007104182 A1 WO2007104182 A1 WO 2007104182A1
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WIPO (PCT)
Prior art keywords
signal
time
frequency domain
optical
transmission system
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PCT/CN2006/000383
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English (en)
Chinese (zh)
Inventor
Jiaying Wang
Ruixin Gao
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Zte Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Zte Corporation filed Critical Zte Corporation
Priority to PCT/CN2006/000383 priority Critical patent/WO2007104182A1/fr
Publication of WO2007104182A1 publication Critical patent/WO2007104182A1/fr

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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
    • H04B10/60—Receivers
    • H04B10/66—Non-coherent receivers, e.g. using direct detection
    • 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
    • H04B10/58—Compensation for non-linear transmitter output

Definitions

  • the present invention relates to the field of optical communication technologies, and in particular, to an optical transmission system and method for correcting frequency-domain distortion of a signal. Background technique
  • optical signals are degraded due to the effects of transmission media (such as optical fibers), optical amplifiers, and other optical processing devices (such as optical filters).
  • transmission media such as optical fibers
  • optical amplifiers such as optical amplifiers
  • other optical processing devices such as optical filters
  • many of the above factors affect the characteristics of optical signals, resulting in system performance degradation, and these factors are difficult to avoid in optical communication systems. Therefore, for the change of the Wei number caused by these factors, use a certain Regulating devices to improve the quality of optical signals is a worthwhile approach.
  • a general optical dispersion compensator for example, a dispersion-compensating fiber or a grating
  • a general optical dispersion compensator can improve the quality of the signal to some extent, but mainly by adjusting the shape of the signal in the time domain by linear changes in the frequency domain, but not, or not completely. It can compensate for the changes in the signal caused by the nonlinear effects of the optical fiber transmission line in both the time domain and the frequency domain.
  • Time-domain equalization filtering is a common method, which is intended to seek recovery of signal form directly in the time domain; and some methods use error correcting codes.
  • Technical signal processing methods such as forward error correction techniques conforming to the ITU-T G.975 standard and methods for improving them, and error correction using the "Maximum Likelihood Sequence Estimation (MLSE)" technology, these methods (e.g. less than 10_ 5) significantly effect the bit error rate is not too high in the case, but can not change fundamentally affect the transmission.
  • MSE Maximum Likelihood Sequence Estimation
  • the technical problem to be solved by the present invention is to provide an optical transmission system and method for correcting frequency-domain distortion of a signal, performing time-frequency domain synthesis and analysis on a received signal, and controlling time domain and frequency domain morphology of the received signal to solve
  • the optical transmission system causes signal distortion during the optical signal transmission process under any routing conditions, and strives to eliminate the dispersion and/or nonlinear effect limitation of the transmission system and improve system performance.
  • the invention provides an optical transmission system for correcting frequency-domain distortion of a signal, comprising:
  • a signal transmitting end for transmitting an optical signal having a known characteristic parameter
  • a signal synthesizer for performing time-frequency domain transformation adjustment on the optical signal transmitted from the signal transmission line
  • a signal regenerator for reproducing the adjusted optical signal into an electrical signal
  • a signal analyzer for performing time-frequency domain analysis on the regenerated electrical signal
  • the controller is configured to perform time-frequency domain optimization adjustment on the signal according to the result of the time-frequency domain analysis.
  • the present invention also provides an optical transmission system for correcting frequency-domain distortion of a signal, comprising: a signal transmitting end for transmitting an optical signal having a known characteristic parameter;
  • a signal regenerator for reproducing an optical signal transmitted from the signal transmission line into an electrical signal
  • a signal synthesizer for performing time-frequency domain transform adjustment of the regenerated electrical signal
  • a signal analyzer for using the time-frequency domain
  • the adjusted electrical signal is subjected to time-frequency domain analysis; the 3 ⁇ 4 controller is configured to perform time-frequency domain optimization adjustment of the signal according to the result of time-frequency domain analysis.
  • the present invention also provides a method for correcting signal time-frequency domain distortion in an optical transmission system, comprising the following steps:
  • the result of the time-frequency domain analysis W of the ideally reconstructed signal s at the receiving end is determined as the ideal time-frequency domain characteristic parameter.
  • step (4) determines p'ij satisfies norm
  • the optical transmission system and method of the present invention can compensate for the influence of the transmission process on the signal, and the beneficial effects thereof are not only that the automatic detection and optimization of the signal can be realized, but also that the transmission system can be eliminated to the utmost extent (especially the intensity modulation/demodulation Dispersion and/or nonlinear effects of the system).
  • 1 is an embodiment of an optical transmission system for automatically correcting signal time-frequency domain distortion, wherein the signal synthesizing device is a controllable optical component group;
  • 2 is another embodiment of an optical transmission system for automatically correcting signal time-frequency domain distortion, the signal synthesis device being a controllable circuit device;
  • Figure 3 is a flow chart of the control process for correcting the frequency domain distortion of the signal
  • Figure 4 is an embodiment when the synthesizer is constructed according to a basis function
  • Figure 5 is an embodiment when a synthesizer equivalent to that of Figure 4 is used;
  • Figure 6 is an embodiment of a synthesizer in which a variable time domain gate is used
  • Figure ⁇ is an embodiment when the multiplier of Figure 4 is simplified
  • Figure 8 is an embodiment of a synthesizer in which a variable retarder is used;
  • Figure 9 is an embodiment of a synthesizer in which a dynamic filter or filter bank is used.
  • the present invention proposes an optical transmission system and method for correcting signal time-frequency domain distortion simultaneously using time-frequency domain analysis and synthesis to optimize the optical communication system. performance.
  • FIG. 1 and FIG. 2 it is an optical transmission system for automatically correcting signal time-frequency domain distortion
  • FIG. 1 is an embodiment of the system
  • the signal synthesizer is a controllable optical component group
  • FIG. 2 is the system.
  • the signal synthesizer is a controllable circuit device
  • FIG. 3 is a flow chart of a control process for realizing frequency domain distortion when correcting signals
  • FIG. 4-9 shows the composition and control of the signal synthesizer, wherein 4 is an embodiment when the synthesizer is constructed according to a basis function
  • FIG. 5 is an embodiment when the synthesizer is equivalent to FIG. 4
  • FIG. 6 is an embodiment of the synthesizer, in which a variable time domain is used.
  • Figure 7 is an embodiment of the simplified multiplier of Figure 4
  • Figure 8 is an embodiment of a synthesizer in which a variable delay is used
  • Figure 9 is an embodiment of a synthesizer in which dynamic filtering is used (or filter bank).
  • 1 signal transmitter; 2: transmission line; 3: signal synthesizer; 4: signal regenerator; 5: controller; 6: signal analyzer; 30: weighted amplification; 31: time domain acquisition; 32: frequency domain acquisition ;
  • FIG. 1 an embodiment of an optical transmission system having a frequency domain distortion function for correcting signals is illustrated.
  • the system includes: a transmitting end (1), a signal transmission line (2), and a time-frequency domain.
  • the optical signal of the transmitting end (1) transmits a long-distance signal through the transmission line (2) Transmitting; time-frequency domain synthesizer (3) adjusts the signal sent at the receiving end to achieve an optimized state; the signal regenerator (4) realizes the regeneration of the optical signal into an electrical signal; 6) Real-time detection of the regenerative signal and time-frequency domain analysis; then the feedback controller (5) is used to adjust the parameters of each component in the synthesizer (3).
  • connection line with a one-way arrow is used to indicate a service signal connection of each hardware portion, and a connection line with a double-headed arrow indicates a connection of a control signal.
  • S is a signal sent from the user, corresponding to the service served by the transmission system.
  • the transmitting end (1) should generally be capable of providing a sounding signal, either exclusively when the signalling route is not serving the traffic signal, so that the receiving end performs optimization of the transmitted signal, or may be accompanied by
  • the service signals are transmitted together so that the receiving end performs real-time adjustment of the signal; meanwhile, the detection signal can be either in-band or out-of-band. If the traffic signal itself has some stable and known characteristic parameters, it can also be optimized directly using the traffic signal itself rather than a dedicated probe signal.
  • the signal transmission line (2) may include an optical fiber or other medium having a significant transmission effect, and the signal routing process represented by the transmission line may include an optical processing function component or device, for example, A component or device that amplifies, filters, cross-switches, etc.
  • the time-frequency domain signal synthesizer (3) generally includes frequency domain or time domain response components such as delays, filters, amplifiers, or the like, or a component group equivalent to the functions of the above devices,
  • the received signal is time-frequency domain adjusted.
  • controller (5) is the source of the control command for the time-frequency domain signal synthesizer to change the operating parameters of the signal synthesizer (for example, the operating parameters of the delay, filter, amplifier, etc.) .
  • Controller output commands (analog or digital) vary depending on the specific configuration of the synthesizer.
  • the signal first passes through the time-frequency domain signal synthesizer (3) and then to the regenerator (4), which means that the signal synthesizer consists of optical processing devices.
  • the time-frequency domain signal synthesizer (3) is an electronic circuit, and transmits The signal output by the line (2) will first pass through the regenerator (4) and then into the time-frequency domain signal synthesizer ( 3 ).
  • the other components work in the same way as the corresponding components described in Figure 1.
  • the achievability is mainly the mathematical method involved in the signal analyzer, and the specific implementation of the signal synthesizer.
  • the former is combined with the working process of the device hereinafter, and relates to the principle description and the embodiment corresponding to the formula 1-8; the latter will be specifically described below corresponding to the device structure embodiment expressed in Fig. 4 to Fig. 9.
  • FIG. 3 a specific implementation flow of the method for correcting the frequency-frequency distortion of the signal in the optical transmission system described above is illustrated.
  • the receiving end receives the received signal.
  • the signal is analyzed by time-frequency domain parameters, and the extracted feature parameters are used to adjust the system in real time or non-real time.
  • Step 1 Determine the ideal time-frequency domain characteristic parameters.
  • a signal S having a known characteristic parameter is determined at the transmitting end of the system, which is ideally reproduced as a signal S at the receiving end, and determines the maximum deviation ⁇ of the characteristic parameters that the system can tolerate.
  • the portion of the signal S at the transmitting end for performance optimization has known characteristic parameters, such as a string of agreed symbols, the ideal of which is known to be reproduced, whether or not it can be ideally reproduced at the receiving end.
  • the result of the time-frequency domain analysis W of the ideally reconstructed signal S at the receiving end is used as an ideal time-frequency domain characteristic parameter, as shown in Equation 1,
  • Step 2 Detect the characteristic parameters of the actual regenerative signal in the transmission system.
  • the optical signal s is transmitted through the system, and the transmission effect is T.
  • the time-frequency domain transform is performed by the time-frequency domain synthesizer C, and the reproduced signal is detected by the time-frequency domain analyzer, and the time-frequency domain of the optical signal transmitted by the system is obtained.
  • Characteristic parameters as shown in Equation 2,
  • the signal S is compared with the ideal target parameter function by systematically transmitting and synthesizing the time-frequency domain characteristic parameter p'ij, and the norm llPij-p'ij II is compared with the predetermined S. If not, it is determined that the actual time-frequency domain characteristic parameter p'g is the system time-frequency domain characteristic parameter.
  • control parameters based on the basis function group and the control parameters not based on the basis function are respectively adjusted.
  • adjust the time-frequency domain transform C to change ⁇ ' 3 ⁇ 4 W(C(T(s))), and adjust the parameters of the synthesizer to change C, so that the norm llp-p' II approaches a minimum. Value, a value less than ⁇ .
  • wavelet analysis when performing time-frequency domain analysis on the signal, many methods can be used to analyze using different functions.
  • One method (but not limited to this method) is wavelet analysis.
  • the different functions described may be base functions or non-base functions.
  • the basis functions are various, and may be orthogonal (such as sin and cos), non-orthogonal, or wavelet packets.
  • a polynomial spline function is one of the simplest functions. .
  • W represents a discrete time-frequency domain transform
  • the obtained set of transform coefficients ⁇ represents the combination of the signal s under a certain set of basis functions ⁇ B isj (f, t) ⁇ .
  • s can be expressed as:
  • Equation 5 ⁇ Xi(t) ⁇ is a function space for realizing time domain decomposition. You can select a group that is easy to implement by hardware, such as a sequence of time domain gate functions or a sequence of step functions. You can use switches, delays, Or a combination to achieve.
  • Equation 5 ⁇ Yj(f) ⁇ is used as the function space for frequency domain decomposition.
  • a set that is convenient to implement in hardware, such as a frequency-series sequence of certain intervals, can be implemented using filters and combinations thereof, or frequency domain acquisition circuits.
  • the so-called synthesis is to perform time-frequency domain transformation on various signal components, that is, first decompose the signals in the time domain and the frequency domain, and then re-synthesize and restore the signal, thereby decomposing and synthesizing the signal.
  • the process is to optimize the signal;
  • the so-called analysis is to decompose the signal to obtain the signal component, that is, to analyze the characteristic parameter p of the synthesized signal.
  • the transformation between the signal s and the characteristic parameter p is by mathematical means: using the basis function and the original function as the inner product; and the physical means: using the basis function as the transmission characteristic device to filter the transmitted signal power of the original signal. .
  • the method of analysis by the analyzer is not necessarily the same as the method of decomposing the signal at the front end of the synthesizer. When it is the same, it is processed according to the following step 3.2.1. When it is not the same, it is processed according to the following 3.2.2. The signal of this part can be used. Tap to get the analysis results.
  • the process of automatically performing time-frequency domain analysis and synthesis of the signal can be further refined into the following steps - Step 3.1: Results and expected results of the frequency domain analysis when the detected signal is in the system operating state When a deviation occurs, the degree of deviation can be found by parameter comparison, and the frequency domain analyzer will send a trigger message to the controller when necessary.
  • the trigger condition can be expressed as: Equation 3: llp-p' II > ⁇ Step 3.2.1: After the controller obtains the trigger, adjust the time-frequency domain control of the system according to the analysis result (such as the coefficient series of the wavelet series and the real-time algorithm restored by these sequences).
  • the formula 8.1 is used for the first control
  • the formula 8.2 is used for iterative control
  • c is a set of parameters for controlling the synthesizer
  • A is a coefficient for compensating for the system error or the convergence of the acceleration control process. That is: If the first control does not eliminate the trigger condition, iterate is required until the trigger condition is removed. Every time the control is completed during the iteration, the resulting p' will change, so it is necessary to compare the difference between p' and p to generate a new control parameter c.
  • Equations 8.1 and 8.2 are only examples of control parameters that may be implemented and may be applied to a range.
  • the synthesizer actually simulates the set of basis functions used by the parser) and requires the order of time domain expansion and time domain expansion. The order is the same.
  • control parameters are more abundant than the embodiments shown in Figures 4 and 5; again, the manner of weighting amplification (30) is shown in the embodiments of Figures 7 and 8, which simplifies Figure 4 and Figure Multiplier (33) shown in 5; More examples The dynamic controllable filter bank (35) is used in the embodiment of Figure 9 to implement frequency domain decomposition and weighted combination. Therefore, the embodiment shown in Figures 6-9 is more suitable for general optimization methods than Equations 8.1 and 8.2.
  • step 33 the time-frequency domain analyzer performs time-frequency domain analysis (formula 2) on the adjusted signal again, and then checks the control result. If the trigger condition represented by formula 3 still exists, return to step 3.1 to implement iterative control, IP. The actual characteristic parameter is compared with the ideal characteristic parameter, and the actual characteristic parameter approaches the ideal characteristic parameter through feedback control; otherwise, the control process stops.
  • a typical feature of the ⁇ invention is the use of a comprehensive device that conforms to the basis function.
  • E.g Using the basis function type shown in Equation 5, an embodiment of the corresponding synthesizer device structure is shown in Figs.
  • the present invention does not exclude another integrated device scheme using a non-base function structure.
  • the basic function embodiment and the synthesizer device structure embodiment do not have a mathematical model correspondence, and the signal analysis extracted parameters are only used.
  • Step 3.2.2 After the controller obtains the trigger, adjust the control parameters according to the direction determined by the general optimization control algorithm, for example, using a "success-fail method", when the adjustment of the previous step makes the Ilp-P' II If it is decreased, the adjustment will continue; when the adjustment of the previous step causes llp-p' II to increase, it will be reversed (when the trigger condition is still satisfied).
  • a "success-fail method” when the adjustment of the previous step makes the Ilp-P' II If it is decreased, the adjustment will continue; when the adjustment of the previous step causes llp-p' II to increase, it will be reversed (when the trigger condition is still satisfied).
  • the above functions may be automatically implemented by the time-frequency domain analyzer and the feedback controller in the method of the present invention during system operation or during system debugging.
  • Figure 4 is an embodiment of the synthesizer according to the basis function.
  • the signal entering the synthesizer is first decomposed into a set of time domain bases by time domain acquisition (31) (the symbol ⁇ > in the figure indicates the signal entering the module).
  • the time domain components are further decomposed into a combination of multiple sets of frequency domain bases by frequency domain acquisition (32), and these time-frequency domain components (marked as) constitute two-dimensional characteristic parameters of time and frequency.
  • the multiplier (33) is weighted by the control parameter (labeled as Ci j), and then combined with the time domain and the frequency domain by the accumulator (34).
  • Figure 5 is an embodiment when using the equivalent synthesizer of Figure 4, the signal entering the synthesizer is first decomposed into a set of frequency domain bases by frequency domain acquisition (32), and the components in the frequency domain respectively pass through the time domain.
  • the acquisition (31) is further decomposed into a combination of sets of time domain components, which are labeled as two-dimensional characteristic parameters of time and frequency.
  • the multiplier (33) is weighted by the control parameter (marked as), and then the accumulator (34) is used to implement the time domain and the frequency domain group. Recovery.
  • the function of the multiplier is marked as bij ⁇ c ik a k j in the figure.
  • Figure 6 is an embodiment of a synthesizer in which a variable time domain gate is used. Further possible in this embodiment is a possible solution for implementing time domain acquisition (31), a combination of real-time domain gate devices, which may be variable, ie their time domain transmission characteristics may be short-lived and With a suitable envelope, the range and amplitude can be controlled, which means that the form of the time domain basis function changes, so the result of the analysis and the way the control parameters are generated will change.
  • time domain acquisition 31
  • real-time domain gate devices which may be variable, ie their time domain transmission characteristics may be short-lived and With a suitable envelope, the range and amplitude can be controlled, which means that the form of the time domain basis function changes, so the result of the analysis and the way the control parameters are generated will change.
  • Figure 7 is an embodiment of the simplified multiplier of Figure 4, with a weighting amplifier (30) instead of a multiplier, functionally multiplied by two-dimensional characteristic parameters and elements of control parameters.
  • Figure 8 is an embodiment of a synthesizer in which a variable retarder is used.
  • This embodiment shows that time domain acquisition (31) can also be implemented using a combined network of delay lines, which facilitates the easy introduction of interactions between different time domain elements and avoids the use of complex multipliers in the time domain. Together with the subsequent weighted amplification of the two-dimensional feature parameters of time and frequency, it can be seen as a simplification of the multiplication of the matrix.
  • Figure 9 is an embodiment of a synthesizer in which a dynamic filter (or filter bank) is used.
  • the signal entering the synthesizer is first decomposed into a set of time domain bases by time domain acquisition (31). After weighted amplification, the components in the time domain are respectively subjected to dynamic filter bank (35) to realize frequency domain decomposition. And regrouping.
  • dynamic filter banks special control interfaces (37) may be required due to the different filter materials and specific control principles that implement the filtering effect (36), which should generally be defined by the device manufacturer.
  • the transition characteristics of the dynamic filter bank are expressed as 1 ⁇ ⁇ Ci jYj(f). In this process, the frequency domain characteristic parameters of each time domain signal component are changed, and then the time domain combination recovery is performed by the accumulator (34).
  • the invention provides an optical transmission system and method for correcting signal time-frequency domain distortion, and controlling time domain and frequency domain morphology of a received signal by performing time-frequency domain synthesis and analysis on a received signal, to solve the optical transmission system in The optical signal transmission process under arbitrary routing conditions causes signal distortion.
  • the optical transmission system and method for correcting signal time-frequency domain distortion according to the present invention can compensate for the influence of the transmission process on the signal, and the beneficial effects thereof are not only that the automatic detection and optimization of the signal can be realized, but also that the transmission can be eliminated to the greatest extent. Dispersion and/or nonlinear effects of the system, especially the system of intensity modulation/demodulation.

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  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
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Abstract

L'invention concerne un système de transmission optique destiné à corriger la distorsion de signal dans le domaine temps-fréquence ainsi qu'un procédé associé. Ce système comprend un synthétiseur de signal (3) destiné à synthétiser le signal optique transmis à partir de la ligne de transmission de signal (2) et un analyseur (6) destiné à analyser le signal synthétisé dans le domaine temps-fréquence. En fonction du résultat de l'analyse dans le domaine temps-fréquence, un dispositif de commande (5) assure la commande à rétroaction du synthétiseur de signal (3) pour optimiser et régler le signal dans le domaine temps-fréquence. L'utilisation du système et du procédé de transmission optique de cette invention permet de compenser la contamination du signal causée par la transmission et de réaliser une détection et une optimisation automatiques du signal. En outre, la dispersion et/ou l'effet non linéaire du système de transmission peuvent être supprimés plus efficacement.
PCT/CN2006/000383 2006-03-14 2006-03-14 Système de transmission optique destiné à corriger la distorsion de signal dans le domaine temps-fréquence et procédé associé WO2007104182A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1210401A (zh) * 1997-08-05 1999-03-10 阿尔卡塔尔-阿尔斯托姆通用电气公司 光域干扰畸变的电信号的均衡方法和设备
US20030076578A1 (en) * 2001-10-15 2003-04-24 Fujitsu Limited Optical transmitting apparatus and an optical transmitting system
CN1479454A (zh) * 2002-07-20 2004-03-03 三星电子株式会社 用于再生全光信号的设备及其方法
CN1592157A (zh) * 2003-08-28 2005-03-09 法国电讯公司 光信号再生设备及相应方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1210401A (zh) * 1997-08-05 1999-03-10 阿尔卡塔尔-阿尔斯托姆通用电气公司 光域干扰畸变的电信号的均衡方法和设备
US20030076578A1 (en) * 2001-10-15 2003-04-24 Fujitsu Limited Optical transmitting apparatus and an optical transmitting system
CN1479454A (zh) * 2002-07-20 2004-03-03 三星电子株式会社 用于再生全光信号的设备及其方法
CN1592157A (zh) * 2003-08-28 2005-03-09 法国电讯公司 光信号再生设备及相应方法

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