Title :
A wideband heterodyne optical phase-locked loop for generation of 3-18 GHz microwave carriers
Author :
Gliese, U. ; Nielsen, T.N. ; Bruun, M. ; Christensen, E. Lintz ; Stubkjaer, K.E. ; Lindgren, S. ; Broberg, B.
Author_Institution :
Center for Broadband Telecommun., Tech. Univ. of Denmark, Lyngby, Denmark
Abstract :
Experimental results of a wideband heterodyne second-order optical phase-locked loop with 1.5- mu 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 rad/sup 2/ 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 10/sup 11/ s and an acquisition range of 640 MHz.<>
Keywords :
laser beam applications; microwave generation; phase-locked loops; semiconductor junction lasers; 1.5 micron; 180 MHz; 3 to 18 GHz; IR; acquisition range; beat signal; cycle slip; linewidth; loop reliability; microwave carriers; microwave reference source; noise level; propagation delay; second-order; semiconductor lasers; total phase variance; wideband heterodyne optical phase-locked loop; Bandwidth; Laser noise; Masers; Microwave generation; Noise level; Optical mixing; Phase locked loops; Propagation delay; Semiconductor lasers; Wideband;
Journal_Title :
Photonics Technology Letters, IEEE
