Phase Noise Measurement of Optical Heterodyning Two-Tone Signal Generated by Two Free-Running Lasers

Ryuta YAMANAKA
Taka FUJITA
Hideyuki SOTOBAYASHI
Atsushi KANNO
Tetsuya KAWANISHI

Publication
IEICE TRANSACTIONS on Electronics   Vol.E96-C    No.2    pp.241-244
Publication Date: 2013/02/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E96.C.241
Print ISSN: 0916-8516
Type of Manuscript: BRIEF PAPER
Category: 
Keyword: 
phase noise,  millimeter wave,  radio-over-fiber,  two free-running lasers,  Mach-Zehnder modulator,  

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Summary: 
We evaluated the single side-band phase noise of a 40 GHz beat signal generated by two free-running lasers. This allowed us to verify the utility of the two free-running lasers is verified as a light source for a next-generation radio-over-fiber system using frequency such as those in the millimeter-wave and terahertz bands. We also measured the phase noise of a frequency quadrupler using a Mach-Zehnder modulator for comparison. The phase noise of the two free-running lasers and the frequency quadrupler are -63.85 and -95.22 dBc/Hz at a 10 kHz offset frequency, respectively.