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Flexible optimization of the signal-to-noise ratio for ultra dense coherent WDM systems

An optical signal and multiplexing technology, applied in the field of optical communication systems, can solve the problems of low sensitivity to optical noise, reduced transmission range, weak tolerance, etc.

Inactive Publication Date: 2014-11-26
ALCATEL LUCENT SAS
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Problems solved by technology

However, such formats are generally less sensitive to optical noise and less tolerant to nonlinear effects, and thus may result in a reduction in transmission range compared to PDM-QPSK

Method used

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  • Flexible optimization of the signal-to-noise ratio for ultra dense coherent WDM systems
  • Flexible optimization of the signal-to-noise ratio for ultra dense coherent WDM systems
  • Flexible optimization of the signal-to-noise ratio for ultra dense coherent WDM systems

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Embodiment Construction

[0032] As outlined in the introductory chapter, WDM channels of different widths can be used to adapt the capacity of the optical transmission system to accommodate impairments in the optical transmission path. exist figure 1 WDM channels 111 , 112 with different channel widths (channel spacing) are illustrated in the WDM channel diagram 110 . When adapting to the width of the WDM channel 111 , the transmitter filter used at the transmitter of the WDM channel 111 has to be adapted to the reduced or increased bandwidth of the WDM channel 111 . Such transmitter filters are mainly used for pulse shaping in order to reduce cross-talk between adjacent WDM channels 111,112. Thus, the transmitter filter may also be referred to as a pulse-shaping filter. The frequency response of a transmitter filter can be designed to optimize (ie to increase) the electrical signal-to-noise ratio (SNR) at the corresponding receiver. In order to adapt the transmitter filter to the modified width of...

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Abstract

The present document relates to optical communication systems. In particular, the present document relates to high efficiency wavelength division multiplexing (WDM) optical communication systems. An optical transmitter (210) adapted to transmit an optical signal on an optical wavelength division multiplexed, referred to as WDM, transmission channel (111) to a corresponding optical receiver (230) is described. The optical transmitter (210) comprises a profiling unit (217) adapted to receive information regarding an equalization filter (270) adapted at the corresponding optical receiver (230), based on a first optical signal received from the optical transmitter (210); a pulse shaping filter unit (212) adapted to filter a sequence of data symbols (211) using a pulse shaping filter, thereby yielding a filtered sequence of data symbols (211); wherein a frequency response (404, 405) of the pulse shaping filter depends on the information regarding the equalization filter (270); and a digital-to-optical converter (214, 215 216) adapted to convert the filtered sequence of data symbols (211) into a second optical signal to be transmitted to the optical receiver (230).

Description

technical field [0001] This article deals with optical communication systems. In particular, this paper relates to high efficiency wavelength division multiplexing (WDM) optical communication systems. Background technique [0002] High spectral efficiency optical communication systems are of interest in addressing the foreseen demand for increased capacity of optical communication networks. In this paper, multilevel modulation formats such as quadrature phase shift keying (QPSK) combined with polarization multiplexing (PDM) and digital coherent detection techniques are being investigated. PDM-QPSK paired with coherent detection can be used to achieve a transmission rate of 112Gb / s (commonly referred to as 100Gb / s). This format is based on a 50GHz grid between two adjacent WDM channels (as in figure 1 As shown in the WDM channel diagram 100 of , where all WDM channels 101 have the same channel bandwidth), yielding a spectral efficiency of 2b / s / Hz in a standard WDM transmis...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/079H04B10/61H04J14/02H04J14/06H04L1/00H04L25/02
CPCH04B10/0799H04J14/026H04L25/0288H04B10/6166H04L1/0035H04J14/02H04J14/0275H04J14/0258H04J14/0273H04J14/06H04L25/02H04B10/508H04B10/67
Inventor J·勒诺迪耶O·博特兰-帕尔多
Owner ALCATEL LUCENT SAS
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