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Communication through phase-conjugated optical variants

一种相位共轭、光学的技术，应用在数据传送的设备领域，能够解决数字信号处理复杂度高等问题

Inactive Publication Date: 2014-07-02
ALCATEL LUCENT SAS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, one problem with FEC coding when applied to optical transmission systems is that the difference in coding gain between the various implementable FEC codes usually does not exceed a certain maximum value, as given by Shannon's information capacity theory
Additionally, the digital signal processing (DSP) complexity for FEC codes of similar capability can be severely high

Method used

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Embodiment Construction

[0033] Optical transmission links are often configured to support multiple degrees of freedom, such as time, space, carrier frequency (wavelength), and polarization. Each of these degrees of freedom can be used for optical signal multiplexing. Multiplexing techniques corresponding to these four different individual degrees of freedom are known in the literature as time division multiplexing, space division multiplexing, wavelength division multiplexing, and polarization division multiplexing.

[0034] In addition to or instead of using the various degrees of freedom supported by the optical transmission link for multiplexed transmission of independent optical signals, various embodiments of the invention employ these degrees of freedom for the transfer of coherent optical signals (known as optical variants). transmission. In a representative embodiment, the two optical variants are two optical signals that carry the same segment of payload data, bit word, or bit sequence, but...

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Abstract

An optical transport system configured to transmit a set of two or more optical variants per bit-word, with the optical variants in the set being different from one another in one or more of the time of transmission, spatial localization, polarization of light, carrier wavelength, and subcarrier frequency. Differences between the optical variants may also be due to different respective constellation mapping. The optical variants of each set are detected and processed at the receiver in a manner that enables coherent summation of the corresponding electrical signals prior to constellation de-mapping. The coherent summation tends to average out the deleterious effects of linear and nonlinear noise / distortions imparted on the individual optical variants in the optical transport link because said noise / distortions are incoherent in nature. A BER reduction enabled by the use of optical variants may be implemented in addition to or instead of that provided by FEC coding.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from U.S. Provisional Patent Application No. 61 / 535,548, filed September 16, 2011, and U.S. Patent Application No. 13 / 245,160, filed September 26, 2011, both titled "PERFORMANCE ENHANCEMENT THROUGH OPTICAL VARIANTS", which is hereby incorporated by reference in its entirety. technical field [0003] The invention(s) relate to optical communication devices, and more particularly, but not exclusively, to devices for managing data transfer over non-linear and / or noisy optical channels. Background technique [0004] This section presents aspects that may help facilitate a better understanding of the invention(s). Accordingly, the statements in this section are to be read in this light and not as an admission as to what is or is not prior art. [0005] Forward error correction (FEC) uses systematically generated redundant data to reduce the bit error rate (BER) at the receiver. The price...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/516H04B10/61
CPCH04B10/516H04B10/00C02F1/78H04B10/61Y02W10/37
Inventor 刘翔A·R·克拉皮里维R·W·塔克P·J·温泽尔
Owner ALCATEL LUCENT SAS
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