Method and system for compensation of laser phase/frequency noise in an optical device
AssigneeFujitsu Limited
InventorsInwoong Kim, Olga I. Vassilieva
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Abstract
In accordance with embodiments of the present disclosure, a method for compensation of noise in an optical device is provided. The method may include calculating noise present in an optical carrier signal. The method may also include generating quadrature amplitude modulation input signals, the quadrature amplitude modulation input signals each including a term for compensation of the noise based on the calculated noise. The method may further include modulating the optical carrier signal to generate a modulated optical signal based on quadrature amplitude modulation input signals.
Claims14
A transmitter for use in an optical system, comprising:
- a laser configured to output an optical carrier signal, the optical output carrier signal having laser phase noise due to finite line width of the laser, the laser phase noise measured with respect to a second laser;
- and
- a modulator configured to modulate the optical carrier signal to output a modulated optical signal based on quadrature amplitude modulation input signals received by the modulator, the quadrature amplitude modulation input signals each including data and a term for compensation of the phase noise, the quadrature amplitude modulation input signals each further including a term for wavelength tracking, the term for wavelength tracking comprising a pilot tone frequency, tracking data, and a maximum frequency deviation, the optical carrier signal being frequency modulated with the pilot tone frequency of the tracking data.
A system comprising:
- a transmitter comprising:
- a laser configured to output an optical carrier signal, the optical output carrier signal having laser phase noise due to finite line width of the laser, the laser phase noise measured with respect to a second laser;
- and
- a modulator configured to modulate the optical carrier signal to output a modulated optical signal based on quadrature amplitude modulation input signals received by the modulator, the quadrature amplitude modulation input signals each including data and a term for compensation of the phase noise, the quadrature amplitude modulation input signals each further including a term for wavelength tracking, the term for wavelength tracking comprising a pilot tone frequency, tracking data, and a maximum frequency deviation, the optical carrier signal being frequency modulated with the pilot tone frequency of the tracking data;
- and
- a processor communicatively coupled to the transmitter and configured to:
- calculate the phase noise;
- and
- generate the quadrature amplitude modulation input signals based on the phase noise.
A method for compensation of noise in an optical device, comprising:
- calculating laser phase noise present in an optical carrier signal transmitted by a laser, the laser phase noise due to finite line width of the laser, the laser phase noise measured with respect to a second laser;
- generating quadrature amplitude modulation input signals, the quadrature amplitude modulation input signals each including data and a term for compensation of the noise based on the phase noise, the quadrature amplitude modulation input signals each further including a term for wavelength tracking, the term for wavelength tracking comprising a pilot tone frequency, tracking data, and a maximum frequency deviation, the optical carrier signal being frequency modulated with the pilot tone frequency of the tracking data;
- and
- modulating the optical carrier signal to generate a modulated optical signal based on quadrature amplitude modulation input signals.
Dependencies are inferred from the claim text.