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Methods and apparatus for improving skew tolerance of coherent optical transponder in optical communication system

A technology of optical transmitters and transponders, which is applied in the direction of selection devices, optics, and optical components of multiplexing systems, and can solve problems such as the inability to implement real-time traffic

Active Publication Date: 2019-11-12
JUMIPER NETWORKS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these solutions rely on specific test data patterns and cannot leverage real-time traffic to implement

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  • Methods and apparatus for improving skew tolerance of coherent optical transponder in optical communication system
  • Methods and apparatus for improving skew tolerance of coherent optical transponder in optical communication system
  • Methods and apparatus for improving skew tolerance of coherent optical transponder in optical communication system

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Embodiment Construction

[0019] Polarization multiplexing (PM) is a modulation technique in which an optical carrier can have different optical polarizations that are independently and simultaneously modulated via electrical signals (eg, information and / or data). The different polarizations may include a first polarization channel "X channel" and a second polarization channel "Y channel", and the X channel and the Y channel may be orthogonal (or approximately orthogonal) to each other. For example, the X channel may be horizontally polarized light, and the Y channel may be vertically polarized light. In some cases, the X and Y channels need not be horizontal and vertical polarization, and need not be orthogonal.

[0020] Quadrature Amplitude Modulation (QAM) is a modulation technique in which two or more binary or multiple channels are combined via an in-phase or "I" channel and a quadrature (90 degree or approximately 90 degree) phase or "Q" channel. The grade electrical data signal is modulated onto a...

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Abstract

In some embodiments, an apparatus includes a memory and a processor operatively coupled to the memory. The processor is configured to be operatively coupled to a first optical transponder and a secondoptical transponder. The processor is configured to receive, from the second optical transponder, a signal representing a skew value of an optical signal and a signal representing a bit-error-rate (BER) value of the optical signal. The skew value is associated with a skew between an in-phase component of the optical signal and a quadrature component of the optical signal. The processor is configured to determine, based on at least one of the skew value or the BER value, if a performance degradation of the first optical transponder satisfies a threshold. The processor is configured to send a control signal to the first optical transponder to adjust a pulse shaping or a data baud rate of the first optical transponder.

Description

Technical field [0001] Some embodiments described herein generally relate to methods and devices for improving the performance of coherent optical transponders in optical communication systems. In particular, but not as a limitation, some embodiments described herein relate to methods and devices for improving the skew tolerance of coherent optical transponders in optical communication systems. Background technique [0002] As the demand for optical communication systems with high data rate capabilities continues to grow, optical quadrature amplitude modulation (QAM) signals are generated to provide high data carrying capabilities and high spectral efficiency. Quadrature Amplitude Modulation (QAM) is a modulation technique in which two or more binary or multilevel electrical data signals are modulated via an in-phase or "I" channel and a quadrature (90 degree) phase or "Q" channel. On a single optical carrier, both the amplitude and phase of the optical carrier are modulated wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/40H04B10/079
CPCH04B10/40H04B10/0795H04B10/07953H04B10/5053H04B10/556H04B10/532H04B10/5161H04B10/613G02B6/12007H04B10/2507H04B10/25073H04B10/612H04B10/614H04B10/616H04B10/6165H04J14/06H04Q2011/0037
Inventor 何轩王强岳洋
Owner JUMIPER NETWORKS INC