Generation of multi-carrier based on a recirculating frequency shifter with delay interferometer

• 来源期刊: 光电子快报（英文版）
• 年，卷（期）: 2013,（6）
• 页码范围: 418-420
• 页数: 3页
• 语种: 英文
• DOI: 10.1007/s11801-013-3124-1

摘要

Recirculating frequency shifter (RFS) can generate stable multi-carrier,but the carrier-to-noise-ratio (CNR) is limited because noise is accumulated round by round in the recirculation loop structure.A modified RFS with a delay interferometer (DI) is proposed in this paper.The DI can suppress the accumulated noise,and enhance the CNR of multi-carrier.The principle of the generation of high quality multi-carrier based on an RFS with DI is analyzed theoretically.50 stable carriers with spacing of 10.7 GHz are successfully generated.The flatness of 50 stable carriers is 3 dB,and the CNR is 43 dB which is increased by 3 dB compared with the structure without DI.