Signal generating device, data restoring device and method thereof
A technology for signal generation and channel recovery, applied in wavelength division multiplexing systems, shaping networks in transmitters/receivers, electrical components, etc. 90-degree phase blur and other issues
Active Publication Date: 2018-03-16
WUHAN POST & TELECOMM RES INST CO LTD
View PDF10 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Since the coherent optical Nyquist WDM system uses a narrow-band filter to compress the signal bandwidth, the inter-symbol interference (ISI: Inter-Symbol Interference) of the signal becomes larger, making the accuracy of blind estimation and the performance of the depolarization multiplexing module degrade , this performance degradation is more pronounced when using high-order digital modulation techniques
In addition, the use of blind estimation algorithms will cause the probability of 90-degree phase ambiguity, that is, phase jumps, resulting in continuous bit errors in the system. Therefore, differential coding must usually be used to avoid this problem
However, using differential encoding comes at the cost of additional optical signal-to-noise power ratio (OSNR)
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0021] Embodiments according to the present invention will be described below with reference to the drawings. In the drawings, like reference numerals denote like elements throughout.
[0022] First, refer to figure 1 The principles of the embodiments of the present invention will be briefly described. In the transmitter, such as figure 1 As shown, first, as in the traditional Nyquist WDM system, for each channel (wavelength), the original single-carrier signal carrying the user data to be transmitted is filtered with a narrowband filter to compress its bandwidth, resulting in a Nyquist Stereo single carrier signal. Then, the symbol training sequence of the OFDM format according to the embodiment of the present invention (that is, the OFDM symbol training sequence) can be synthesized with the Nyquist single-carrier signal, thereby generating a composite with the frame format according to the embodiment of the present invention signal (that is, the Nyquist single-carrier si...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
Disclosed are a signal generating device, a data restoring device and a method thereof. The signal generating device includes: a Nyquist signal generating device configured to generate a Nyquist data signal based on user data to be transmitted; a synthesis device configured to generate a Nyquist data signal based on the Nyquist data signal and pre-stored The OFDM symbol training sequence generates a composite signal, the composite signal includes at least one frame, each frame includes the OFDM symbol training sequence and a data sequence of a predetermined length sequentially extracted from the Nyquist data signal; and a conversion device configured to convert the composite signal into an optical signal of a predetermined wavelength. By using the device and method, the cycle-skipping problem in the traditional Nyquist WDM system can be avoided, and data recovery can be performed independently of the digital modulation format used by the transmitter, thereby having greater flexibility.
Description
technical field [0001] The present invention relates to a coherent optical Nyquist wavelength division multiplexing (Nyquist-WDM) system, and in particular to a signal generating device, a data recovery device and a corresponding method that can be used in the coherent optical Nyquist WDM system. Background technique [0002] At present, the coherent optical transmission system has become a standard solution for 100G commercial systems. However, with the rapid development of various large-bandwidth data services, the traditional 50G / 100G channel grid can no longer meet the needs of the transmission system. Therefore, a flexible grid technology based on integer multiples of 12.5GHz is proposed. In this context, the coherent optical Nyquist single-carrier transmission technology and the coherent optical Nyquist WDM system based on this technology are proposed. Compared with the traditional single-carrier transmission technology, it uses narrow-band electrical / optical filters t...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04J14/02H04B1/10H04L27/26
Inventor 肖潇李婕胡荣杨奇
Owner WUHAN POST & TELECOMM RES INST CO LTD