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US 10,523,315 B2Granted
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.
Claims20
A method comprising:
- for each of at two of a plurality of spectral band signals, each spectral band signal occupying a respective one of a plurality of adjacent spectral bands, modulating the spectral band signal with a respective pilot tone to produce a respective spectral band signal with applied pilot tone by multiplying the respective pilot tone with the respective spectral band signal, the pilot tones differing from each other;
- combining the spectral band signals with applied pilot tones and any remaining spectral band signals 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.
An apparatus comprising:
- a pilot tone modulator configured to, for each of at two of a plurality of spectral band signals, each spectral band signal occupying a respective one of a plurality of adjacent spectral bands, modulate the spectral band signal with a respective pilot tone to produce a respective pilot tone modulated spectral band signal by multiplying the respective pilot tone with the respective spectral band signal, the pilot tones differing from each other;
- a spectral band combiner for recombining the pilot tone modulated spectral band signals and any remaining spectral band signals 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.
Dependencies are inferred from the claim text.