Optical continuous phase modulation and demodulation device

A phase modulation and modulator technology, applied in the field of optical continuous phase modulation methods and devices, can solve problems such as difficult high-speed modulation, limited system transmission capacity, and broadening of the output signal spectrum
CN102354076AInactive Publication Date: 2012-02-15HUAZHONG UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HUAZHONG UNIV OF SCI & TECH
Publication Date
2012-02-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a modulation method and a modulation device by which optical continuous phase frequency shift keying (CPFSK) with any modulation index can be realized. The device comprises a modulation part and a demodulation part, wherein the modulation part is implemented by using a two-arm structure of a mach zehnder interferometer (MZM), and a phase continuity mode is implemented by controlling the time delay of an input waveform. The invention can provide a modulation-index variable optical CPFSK method and a modulation-index variable optical CPFSK device, by which an optical CPFSK signal with constant envelope, continuous phases and any modulation index can be generated, thereby overcoming a nonlinear effect in an optical transmission process, and improving the dispersion tolerance and the PMD (polarization mode dispersion) tolerance.
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Description

technical field

[0001] The invention belongs to the field of digital modulation in the field of high-speed optical fiber communication, and in particular relates to an optical continuous phase (CPFSK) modulation method and device. Background technique

[0002] The research on signal modulation format is a hot spot in the field of optical communication. The improvement of transmission performance of new modulation format has attracted people's attention, especially in suppressing nonlinear effects, improving dispersion tolerance and polarization mode dispersion (PMD) tolerance. Good results have been achieved. In the optical fiber communication system, the continuous light wave or light pulse train emitted by the light source does not carry information and can only be used as a carrier of information. The optical carrier signal is a signal related to the polarization direction, signal amplitude, carrier frequency, and carrier phase. If any one of the four quantities is selec...

Claims

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