A 1.55-µm Lightwave Frequency Synthesizer

Osamu ISHIDA  Hiromu TOBA  

IEICE TRANSACTIONS on Communications   Vol.E75-B   No.4   pp.275-280
Publication Date: 1992/04/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Advanced Optical Communication Technologies for New Applications)
optical communications,  lasers,  frequency stabilization,  HCN,  

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A frame-installed lightwave synthesizer is constructed for optical frequency-division-multiplexing (FDM) communication. The synthesizer consists of two DFB diode lasers, electrical feedback loops, and an HCN gas cell used as a frequency reference at v0=192,843GHz (1.55459µm in wave-length). Output frequency can be stabilized at anywhere within v0(220) GHz. The beat note observed between the synthesizer and another HCN-stabilized DFB laser is constant within 2MHz over 100 hours. Frequency stability better than 410-10 (80kHz, without normalization) is obtained for an averaging time of 200s.