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Coherent Optical Generation of a 6 GHz Microwave Signal with Directly Phase Locked Semiconductor DFB Lasers

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7 Author(s)
Gliese, U. ; Center for Broadband Telecommunications, Electromagnetics Institute, Technical University of Denmark, Building 348, DK-2800 Lyngby, Denmark ; Nielsen, T.N. ; Bruun, M. ; Christensen, E.Lintz
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Experimental results of a wideband heterodyne second order optical phase locked loop with 1.5 ¿m semiconductor lasers are presented. The loop has a bandwidth of 180 MHz, a gain of 181 dBHz and a propagation delay of only 400 ps. A beat signal of 8 MHz linewidth is phase locked to become a replica of a microwave reference source close to carrier with a noise level of ¿125 dBc/Hz. The total phase variance of the locked carrier is 0.04 rad2 and carriers can be generated in a continuous range from 3 to 18 GHz. The loop reliability is excellent with an average time to cycle slip of 1011 seconds and an acquisition range of 640 MHz.

Published in:

Microwave Conference, 1992. 22nd European  (Volume:2 )

Date of Conference:

5-9 Sept. 1992