Narrow-band dpsk apparatus, system, method

A narrowband, optical communication system technology, applied in the field of optical transmission systems, can solve the problems of poor nonlinear transmission performance, low cost efficiency, low cost efficiency of DPSK, etc., and achieve the effects of high cost efficiency, improved sensitivity, and narrow bandwidth

Inactive Publication Date: 2012-05-30
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The second option is to use partial differential phase shift keying (DPSK), but partial DPSK is not cost efficient
A third approach is to use coherent detection with high level modulation, but this is not cost effective and may also have poor nonlinear transmission performance

Method used

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  • Narrow-band dpsk apparatus, system, method
  • Narrow-band dpsk apparatus, system, method
  • Narrow-band dpsk apparatus, system, method

Examples

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Embodiment Construction

[0020] Various example embodiments will be described more fully hereinafter with reference to the accompanying drawings, wherein like numerals refer to like elements throughout the description.

[0021] Specific structural and functional details disclosed herein are merely representative for purposes of describing example embodiments. Example embodiments may, however, be embodied in many alternative forms and should not be construed as limited to only the embodiments set forth herein.

[0022] It will be understood that although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms, since these terms are only used to distinguish different elements. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of example embodiments.

[0023] As used herein in this specification, the term "and" includes...

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Abstract

System, apparatus and methods are provided for optical communication which tolerates the tight filtering effects from concatenation of reconfigurable optical add drop multiplexers (ROADMs). An exemplary system includes a receiver configured to receive a Narrow-Band Differential-Phase-Shift-Keyed (NB-DPSK) optical signal. The receiver includes a Delay Line Interferometer (DLI) with a path length difference of less than approximately one bit period and a detector for detecting DLI output to form an electrical signal. The bandwidth of the NB-DPSK optical signal is less than approximately one-half of a first bit rate of a transmitter from which the NB-DPSK optical signal is received. The electrical signal is processed to decode transmitted data. A corresponding transmitter amplifies a first input signal having a first bit rate; and drives a DPSK modulator after amplification to generate the NB-DPSK optical signal, which has a bandwidth less than approximately one-half of the first bit rate.

Description

technical field [0001] The present invention relates to optical transmission systems, and more particularly to systems, devices and techniques for use in optical transmission systems including reconfigurable optical add-drop multiplexers (ROADMs). Background technique [0002] Optical networks not only require high spectral efficiency, but also require the ability to accommodate multiple reconfigurable optical add-drop multiplexers (ROADMs). ROADMs allow channels to be added and dropped at ROADM locations in an optical network so that channels can travel throughout the network from a source location to a destination location. For example, a 40-Gb / s signal needs to be able to traverse multiple ROADMs in a wavelength-division multiplexing (WDM) system with 50-GHz channel spacing in order to reach the desired destination. In this optical network, cascading of ROADMs results in tight filtering effects. For example, each ROADM can be modeled as a filter, and the cascading of mu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/155H04B10/158
CPCH04B10/677H04B10/50H04L27/18
Inventor A·H·格瑙克谢崇今
Owner ALCATEL LUCENT SAS
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