Title :
Optoelectronic Oscillators Using Direct-Modulated Semiconductor Lasers Under Strong Optical Injection
Author :
Sung, Hyuk Kee ; Zhao, Xiaoxue ; Lau, Erwin K. ; Parekh, Devang ; Chang-Hasnain, Connie J. ; Wu, Ming C.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Univ. of California, Berkeley, CA
Abstract :
In this paper, optoelectronic oscillators (OEOs) are demonstrated by using direct-modulated edge-emitting lasers under strong optical injection. The optically injection-locked OEO (OIL-OEO) enables a stable optoelectronic oscillation by converting an optical signal to an electrical signal through a long optical fiber loop. Low RF threshold gain of 7 dB for loop oscillation is attained by utilizing the cavity resonance amplification of an injection-locked semiconductor laser. We investigated both the open- and closed-loop characteristics of the OIL-OEO link by varying the injection locking parameters. Using this novel technique with optimized locking parameters, a 20-GHz RF signal with a phase noise of -123 dBc/Hz is successfully achieved without sophisticated frequency or temperature stabilization.
Keywords :
electro-optical effects; injection locked oscillators; laser beams; laser cavity resonators; optical fibres; optical modulation; optoelectronic devices; phase noise; semiconductor lasers; cavity resonance amplification; direct-modulated semiconductor laser; edge-emitting laser; frequency 20 GHz; gain 7 dB; optical fiber loop; optically injection-locked OEO; optoelectronic oscillator; phase noise; sophisticated frequency; temperature stabilization; Fiber lasers; Gain; Injection-locked oscillators; Laser noise; Optical fibers; Phase noise; Radio frequency; Resonance; Semiconductor lasers; Stimulated emission; Direct modulation; optical injection locking (OIL); optoelectronic oscillator (OEO); semiconductor laser;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/JSTQE.2008.2010334
