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US 2018/0294874 A1Published application
Systems and method of multi-band pilot tone based optical performance monitoring
AssigneeHuawei Technologies Co., Ltd.
InventorZHIPING JIANG
Life of this patent
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Abstract
Systems and methods for applying a pilot tone to multiple spectral bands are provided. An initial signal is divided into multiple spectral bands. A pilot tone is applied to each of the spectral bands, and then the signals are again combined for transmission. The pilot tones differ in some way, for example in phase or frequency.
Claims31
A method comprising:
- applying a respective pilot tone to each of at least two of a plurality of spectral bands to produce a respective spectral band with applied pilot tone, the pilot tones differing from each other;
- combining the spectral bands with applied pilot tones and any remaining spectral bands to which a pilot tone was not applied to produce a combined time domain digital signal;
- converting the combined time domain digital signal to an optical channel signal.
A method comprising:
- receiving an optical channel signal in which different pilot tones have been applied to each of at least two sub-bands;
- performing optical channel performance monitoring based on detecting the pilot tones.
An apparatus comprising:
- a pilot tone modulator for applying a respective pilot tone to each of at least two of a plurality of spectral bands to produce a respective pilot tone modulated spectral band, the pilot tones differing from each other;
- a spectral band combiner for recombining the pilot tone modulated spectral bands and any remaining spectral bands that were not modulated by respective pilot tones to produce a combined time domain digital signal;
- an electrical to optical modulator for converting the combined time domain digital signal to an optical channel signal.
An apparatus comprising:
- a receiver for receiving an optical channel signal in which different pilot tones have been applied to each of at least two sub-bands;
- an optical channel performance monitor for performing optical channel performance monitoring based on detecting the pilot tones.
Dependencies are inferred from the claim text.