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Digital signal-to-signal beat noise for filter-less coherent receiving system

A filter-free, coherent reception technology, applied in wavelength division multiplexing systems, electromagnetic wave transmission systems, transmission systems, etc., can solve the problems of increasing implementation costs and complexity, increase the number of optical lines, reduce component costs, reduce cost effect

Active Publication Date: 2013-10-23
NEC CORP
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Problems solved by technology

However this approach will increase implementation cost and complexity since additional channels are required for down-conversion (three channels instead of two in each polarization)
Also requires more DSP resources due to extra steps for I and Q component extraction

Method used

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  • Digital signal-to-signal beat noise for filter-less coherent receiving system
  • Digital signal-to-signal beat noise for filter-less coherent receiving system
  • Digital signal-to-signal beat noise for filter-less coherent receiving system

Examples

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Embodiment Construction

[0015] figure 1 An exemplary filterless coherent receiver is shown that includes a standard coherent receiver front end, an additional front end for signal-signal beat noise detection and cancellation of signal-signal interference in the digital domain. figure 2 The captured signal waveforms generated during the simulation are shown. Multiple WDM optical signals (10) are first split using a polarization maintaining (PM) coupler (20) and connected to two different front-end modules through two PM fibers (21, 22). The filterless coherent receiver front-end uses a tunable frequency LO (11) to select one of the WDM channels for O using optical hybrids (30), photodiodes (40-43), and ADCs (50-53) / E down-conversion and A / D conversion. After DC blocking, the down-converted photocurrent power by per quadrature will have LO signal beat term and signal-signal beat term:

[0016]

[0017] (R: photodiode responsivity; P ch : optical power per channel, P LO : LO optical power, N ...

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Abstract

Systems and methods are disclosed for a filter-less coherent receiving system with a filter-less coherent receiver frontend; a signal-signal beat-noise detector coupled to the filter-less coherent receiver frontend; and a real-time processor coupled to the filter-less coherent receiver frontend and the signal-signal beat-noise detector to reject signal-signal interference.

Description

technical field [0001] This application claims priority to Provisional Application Serial No. 61 / 446,762, filed February 25, 2011, the contents of which are incorporated by reference. [0002] This application relates to filterless coherent optical receivers. Background technique [0003] Coherent light detection has become a mature commercial technology and has revolutionized fiber optic communications. The advantages of coherent detection are increased receiver sensitivity, increased spectral efficiency, and digital compensation for channel loss, which can be achieved by restoration of the electric field. The combination of coherent detection and tunable optics facilitates dynamically tunable transceivers whose operation is defined by control layer software. A colorless and directionless reconfigurable optical add-drop multiplexer (ROADM) architecture using a coherent receiver in each transponder in all dropped channels of a node was recently proposed, where the local os...

Claims

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Application Information

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IPC IPC(8): H04B10/148H04J14/02H04B10/18
CPCH04J14/021H04B10/616H04J14/06
Inventor Y-K.黃E.伊普D.钱P.N.纪Y.奥诺T.塔吉马
Owner NEC CORP
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