A scheme for improving optical signal-to-noise ratio of multi-carrier source based on recirculating frequency shifter | Zendy

Liu Na | Zendy; Lixia Xi | Zendy; Jianping Li | Zendy; Xiaoguang Zhang | Zendy; Feng Tian | Zendy; Hao Zhou | Zendy

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A scheme for improving optical signal-to-noise ratio of multi-carrier source based on recirculating frequency shifter

Author(s) -

Liu Na,

Lixia Xi,

Jianping Li,

Xiaoguang Zhang,

Feng Tian,

Hao Zhou

Publication year - 2012

Publication title -

acta physica sinica

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.199

H-Index - 47

ISSN - 1000-3290

DOI - 10.7498/aps.61.174209

Subject(s) - crosstalk , third order , electronic engineering , carrier signal , computer science , optoelectronics , physics , telecommunications , optics , engineering , philosophy , theology , transmission (telecommunications)

The output quality of frequency-locked multi-carrier source based on recirculating frequency shifter (RFS) technology is easily influenced by the inherent high-order harmonic crosstalk of modulator, especially the third-order crosstalk. In order to reduce the third-order crosstalk, a scheme that another RF signal whose frequency is 3fm is loaded on both ports of I/Q modulator is adopted. The first-order signal it produces is used to suppress the third-order crosstalk. A multi-carrier source whose number is 24 and maximal power difference is smaller than 0.1 dB is achieved through theoretical analysis and simulation research. The effective optical signal-to-noise ratio (OSNR) of multi-carrier source is improved by 2 dB compared with that before using the scheme of suppressing third-order crosstalk.

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