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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 29 — Oct. 10, 2013
  • pp: 7194–7199

Measurement of the phase shift between intensity and frequency modulations within DFB-LD and its influences on PGC demodulation in a fiber-optic sensor system

Kai Wang, Min Zhang, Fajie Duan, Shangran Xie, and Yanbiao Liao  »View Author Affiliations


Applied Optics, Vol. 52, Issue 29, pp. 7194-7199 (2013)
http://dx.doi.org/10.1364/AO.52.007194


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Abstract

The parameters of the semiconductor laser source are vital for the performances of optical coherent systems. In this paper, a novel method to measure the phase-shift φm between laser central optical-frequency modulation (COFM) and the accompanied optical-intensity modulation (AOIM) is proposed, which is easy to realize and requires no further fiber etalons or high-speed demodulators. An orthogonal test is utilized to measure φm. Experimental results show that the value of φm approaches 1.09π under different COFM conditions. Then the interference model of phase-generated carrier (PGC) demodulation is modified by taking into account the effect of φm, and the influences of φm on the demodulation results using two methods (look-up table and AOIM-factor division) are further analyzed in detail.

© 2013 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(300.6260) Spectroscopy : Spectroscopy, diode lasers

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: July 25, 2013
Revised Manuscript: September 11, 2013
Manuscript Accepted: September 14, 2013
Published: October 10, 2013

Citation
Kai Wang, Min Zhang, Fajie Duan, Shangran Xie, and Yanbiao Liao, "Measurement of the phase shift between intensity and frequency modulations within DFB-LD and its influences on PGC demodulation in a fiber-optic sensor system," Appl. Opt. 52, 7194-7199 (2013)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-29-7194

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