Generation of multi-carrier based on a recirculating frequency shifter with delay interferometer
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Abstract:
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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This work has been supported by the National Natural Science Foundation of China （No：61205065）, the Specialized Research Fund for the Doctoral Program of Higher Education of China （No.20110005110014）, and the Provincial Natural Foundation of Shandong （No.ZR2010FM043）.
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