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TUNABLE RECEIVER BANDWIDTH FOR FLEXIBLE BAUD RATE AND COLORLESS, GRIDLESS OPTICAL NETWORK

IP.com Disclosure Number: IPCOM000245534D
Publication Date: 2016-Mar-15
Document File: 6 page(s) / 579K

Publishing Venue

The IP.com Prior Art Database

Abstract

This disclosure provides switchable/tunable receiver bandwidth (filter) to enable flexible baud rate and colorless, gridless optical network designs. The tunable receiver bandwidth can either be implemented optically or electrically. Flexible baud rate and colorless, gridless optical network pose a set of new challenges to the receiver not encountered in previous optical receiver designs. Currently, a colorless optical network is fixed rate; therefore, a fixed receiver bandwidth design is acceptable. However, to support flexible baud rate and colorless, gridless optical network, a switchable/tunable receiver bandwidth is a requirement to provide acceptable signal recovery (e.g. clock recovery) and integrity (e.g. Signal-to-Noise Ratio (SNR) and distortion). The application of switchable/tunable receiver bandwidth to enable flexible baud rate in a colorless, gridless optical network is key.

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TUNABLE RECEIVER BANDWIDTH FOR FLEXIBLE BAUD RATE AND COLORLESS, GRIDLESS OPTICAL NETWORK

ABSTRACT

[0001]               This disclosure provides switchable/tunable receiver bandwidth (filter) to enable flexible baud rate and colorless, gridless optical network designs.  The tunable receiver bandwidth can either be implemented optically or electrically.  Flexible baud rate and colorless, gridless optical network pose a set of new challenges to the receiver not encountered in previous optical receiver designs.  Currently, a colorless optical network is fixed rate; therefore, a fixed receiver bandwidth design is acceptable.  However, to support flexible baud rate and colorless, gridless optical network, a switchable/tunable receiver bandwidth is a requirement to provide acceptable signal recovery (e.g. clock recovery) and integrity (e.g. Signal-to-Noise Ratio (SNR) and distortion).  The application of switchable/tunable receiver bandwidth to enable flexible baud rate in a colorless, gridless optical network is key.

BACKGROUND

[0002]               Conventionally, optical networks are using coherent modulation through optical networks adapted to operate in a colorless and gridless manner. For example, an optical modem can have a wide receiver bandwidth (e.g., 28GHz) that can accept a high baud/s signal (e.g., 56GBaud/s).  When this associated receiver operates at a lower baud/s rate (e.g., 35GBaud/s), an associated Analog-to-Digital Converter (ADC) will receive and sample both the signal and interference and use a sharp digital filter (e.g., at ~18-20GHz) to remove the out-of-band signal.  Disadvantageously, electric circuitry (e.g., an Application Specific Integrated Circuit (ASIC)) in such configurations can only operate at high sampling speeds, even when processing the lower baud/s rate signal (e.g., the 35GBaud/s signal), i.e. high-power consumption even at low baud rate mode.  The optical compensation capability of the electric circuitry is not maximized for 35GBaud/s mode at the high sampling speed (e.g. chromatic, l spacing).  Nonlinear distortion in the transimpedance/variable-gain amplifier (TIA VGA) and/or ADC due to adjacent channel overload is still present.  Also, inaccurate signal power detection occurs due to adjacent channel power “bleeding” into the power detector.

DETAILED DESCRIPTION

[0003]               Again, this disclosure provides switchable/tunable receiver bandwidth (filter) to enable flexible baud rate and colorless, gridless optical network.  The tunable receiver bandwidth can either be implemented optically or electrically.  Flexible baud rate and colorless, gridless optical network pose a set of new challenges to the receiver not encountered in previous optical receiver designs.  Currently, a colorless optical network is fixed rate; therefore, a fixed receiver bandwidth design is acceptable.  However, to support flexible baud rate and colorless, gridless optical network, a switchable/tunable receiver bandwidth is a requirement to provide acc...