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Optical receiver and method for optical reception

A technology for optical receivers and coefficients, applied in optical receivers and in the field of optical reception, can solve problems such as inability to compensate high-precision distortion

Active Publication Date: 2013-10-02
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this reason, by the method of performing nonlinear distortion compensation after performing linear distortion compensation together for a plurality of transmission spans, distortion compensation, especially nonlinear distortion compensation cannot be performed with high precision

Method used

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  • Optical receiver and method for optical reception
  • Optical receiver and method for optical reception
  • Optical receiver and method for optical reception

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Embodiment Construction

[0052] The optical receiver according to the present invention is characterized in that waveform equalization processing is performed using filter coefficients including coefficients for improving degradation of analog characteristics in each signal compensation unit of the digital signal processing unit.

[0053] Generally, FIR digital filters with finite impulse response characteristics are applied as time-domain equalization filters for waveform equalization.

[0054] image 3 is a block diagram of an exemplary construction of a FIR filter.

[0055] The FIR filter includes, for example, a delay unit 71 including a plurality of delay circuits connected in series, a multiplication unit 72 including a plurality of complex multipliers, and an addition unit 73 composed of complex adders. Each delay circuit delays an input complex signal equal to the sampling time T, and then outputs the delayed signal to the subsequent stage. Also, each complex multiplier complex-multiplies th...

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Abstract

To improve deterioration of reception sensitivity caused by deterioration of analog characteristics in an optical receiver, an optical receiver comprises: a first coefficient calculator for calculating a first equalizing filter coefficient that compensates for a first waveform distortion originating in an optical transmission line; a second coefficient calculator for setting in advance a second equalizing filter coefficient that compensates for a second waveform distortion originating in the deterioration of the analog characteristics of a structural component; a coefficient computer for computing the first equalizing filter coefficient and the second equalizing filter coefficient and outputting a third equalizing filter coefficient; and a waveform equalization processor for performing an equalization process on an input signal that includes the first waveform distortion and the second waveform distortion on the basis of the third equalizing filter coefficient, the waveform equalization processor including a waveform equalization filter for correcting both the first waveform distortion and the second waveform distortion and outputting an output signal.

Description

technical field [0001] The present invention relates to an optical receiver and a method for light reception, and in particular, to an optical receiver and a method for light reception to which a digital coherent light reception method is applied. Background technique [0002] In recent years, with the increase in optical transmission capacity and speed, equipment cost reduction and signal transmission efficiency improvement have been performed for optical receivers for optical fiber communication systems by applying digital coherent optical receiving methods. In the digital coherent light receiving method, in order to receive information superimposed on the amplitude and phase in the optical field, this method mixes the received light with local oscillation light (local luminescence) having an optical frequency almost equal to it, The interference light generated by this mixing is detected by a photodetector and converted into an electrical signal. [0003] An optical rece...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/69H04B10/2525
CPCH04B10/6971H04B10/6161
Inventor 松井淳一安部淳一小笠原大作
Owner NEC CORP