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Interchannel-time coding method for multichannel transmission systems

A coding method and time coding technology, which is applied in the field of inter-channel-time coding for multi-channel transmission systems, can solve the problems of increasing the number of users, achieve the goal of improving optical signal-to-noise ratio, high spectral efficiency, and reducing nonlinear effects Effect

Inactive Publication Date: 2007-07-25
ALCATEL LUCENT SAS
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AI Technical Summary

Problems solved by technology

The narrow channel spacing thus made possible increases the system capacity and thus increases the possible number of users per specific bandwidth in digital communication systems

Method used

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  • Interchannel-time coding method for multichannel transmission systems
  • Interchannel-time coding method for multichannel transmission systems
  • Interchannel-time coding method for multichannel transmission systems

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Embodiment Construction

[0033] The optical transmission system 10 utilizing inter-channel-time coding shown in Figure 1 basically comprises a fully compensated optical transmission link 11, an inter-channel-time coder 12 and a multiplexer 13 at the transmitter side 14, and at the receiver Demultiplexer 15 and inter-channel-time decoder 16 of side 17. FIG. 1 also shows the transmitter TX at the transmitter side 14 for each channel i i and the receiver RX on the receiver side 17 i a simplified representation of . Transmitter TX i includes all necessary components from the pulse shaper to the modulator, and the receiver RX i Includes all necessary components from receive filters to samplers.

[0034] In the encoder, N consecutive bits of M channels jointly encoded between the channels form the M×N input matrix of the decoder. Here M≤K should be selected, where K is the total channel number of the WDM system. The encoder adds Q parity bits on each channel and outputs an M×(N+Q) output matrix whose ...

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Abstract

A coding method for multichannel optical transmission systems ( 10 ) is described, in which coding is carried out both in the time direction and over a plurality of channels, a mapping being selected for the coding such that the simultaneous occurrence of bits with a signal value of ''1'' in neighbouring channels is excluded. A multichannel optical transmission system for carrying out the method is furthermore described, as well as a coder ( 12 ) for use in conjunction with such a multichannel optical transmission system ( 10 ).

Description

technical field [0001] The invention relates to a coding method for use in multi-channel, especially optical transmission systems, wherein the coding is carried out in the time direction and on multiple channels. Background technique [0002] Inter-channel-time coding, also called wavelength-time coding (WTC), is a coding method that enables multi-channel optical transmission systems with strong inter-channel interference (ICI) to achieve more robust transmission characteristics. A multi-channel optical transmission network is also called a photonic network, a wavelength multiplexing system, and a wavelength division multiplexing optical system (WDM). [0003] In inter-channel-time coding, coding is carried out not only in the time direction but also over multiple channels. The bits in the associated channel are used in the encoding. [0004] US6,313,932B1 and US6,522,436B2 disclose a coding method for a multi-channel optical transmission system, wherein an error correctio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J14/02H04L1/00
CPCH04J14/007H04J14/02
Inventor 弗兰克·沙伊希约阿希姆·施派德尔
Owner ALCATEL LUCENT SAS
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