Optoelectronics Letters, Volume. 9, Issue 6, 418(2013)
Generation of multi-carrier based on a recirculating frequency shifter with delay interferometer
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.
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CHENG Hong-qiao, XI Li-xia, LIN Jia-chuan, ZHANG Xiao-guang, ZHANG Xia, LI Jian-rui. Generation of multi-carrier based on a recirculating frequency shifter with delay interferometer[J]. Optoelectronics Letters, 2013, 9(6): 418
Received: Jul. 8, 2013
Accepted: --
Published Online: Oct. 12, 2017
The Author Email: Li-xia XI (xilixia@bupt.edu.cn)