title: Flattened comb generation using only phase modulators driven by fundamental frequency sinusoidal sources with small frequency offset.
abstract: We propose and experimentally demonstrate a simple scheme to generate flattened optical subcarriers at low insertion loss using only phase modulators driven by fundamental frequency sinusoidal sources. A small frequency offset is introduced in the second stage to obtain phase-insensitive, stable, and flattened subcarriers. Theoretical and numerical analysis with experimental results are carried out on this scheme. Twenty-one stable comb tones with 25 GHz frequency spacing are obtained with power difference less than 3 dB. The good bit-error-ratio performance of 160.8 Gb/s polarization-division-multiplexing quadrature-phase-shift-keying signal carried by one selected subcarrier clearly demonstrates the feasibility of this comb generation scheme.
authors: Department of Communication Science and Engineering, Fudan University, Shanghai 200433, China.
authors: Junwen
authors: J
authors: Zhang
authors: Jianjun
authors: J
authors: Yu
authors: Nan
authors: N
authors: Chi
authors: Ze
authors: Z
authors: Dong
authors: Xinying
authors: X
authors: Li
authors: Yufeng
authors: Y
authors: Shao
authors: Jianguo
authors: J
authors: Yu
authors: Li
authors: L
authors: Tao