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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 37, Iss. 28 — Oct. 1, 1998
  • pp: 6615–6622

Experimental investigation of an optically amplified time-division-multiplexed polarization-insensitive fiber-optic Michelson interferometric sensor system

Yung-Kuang Chen, Pi-Cheng Law, and Shih-Chu Huang  »View Author Affiliations


Applied Optics, Vol. 37, Issue 28, pp. 6615-6622 (1998)
http://dx.doi.org/10.1364/AO.37.006615


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Abstract

We experimentally investigate optically amplified time-division-multiplexed polarization-insensitive fiber-optic Michelson interferometric (PIFOMI) sensor systems, using an erbium-doped fiber amplifier (EDFA) and a phase-generated carrier (PGC) demodulation technique. The influence of the EDFA on the extinction ratio (ER) of the light pulse and on the minimum phase-detection sensitivity (MPDS) is examined. We find that the EDFA acting as a preamplifier has limited usefulness because the highly amplified spontaneous emission (ASE) noise generated by the EDFA degrades the ER and the MPDS. However, both postamplifiers and in-line EDFA’s can work successfully. The MPDS of the unamplified time-division-multiplexed PIFOMI system with an ER of 33 dB was 2.4 × 10-5 rad/(Hz)1/2 at ∼1 kHz. For maintaining a MPDS of better than 3.4 × 10-5 rad/(Hz)1/2 at ∼1 kHz, the worst ER’s for the postamplified and in-line amplified systems were 20 and 17.8 dB, respectively. The corresponding input signal peak power should be larger than -20 and -25 dBm for the postamplifiers and in-line amplifiers, respectively. When two postamplifiers and two in-line amplifiers are used, an allowable sensor system loss of 47 dB and a link length of the input–output lead fiber of 108 km can be realized for this system with a 32-sensor array. Implementation of optically amplified time-division-multiplexed and wavelength-division multiplexed–time-division multiplexed PIFOMI subarray sensor systems are also addressed.

© 1998 Optical Society of America

OCIS Codes
(060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(060.4230) Fiber optics and optical communications : Multiplexing
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(130.6010) Integrated optics : Sensors

History
Original Manuscript: May 11, 1998
Published: October 1, 1998

Citation
Yung-Kuang Chen, Pi-Cheng Law, and Shih-Chu Huang, "Experimental investigation of an optically amplified time-division-multiplexed polarization-insensitive fiber-optic Michelson interferometric sensor system," Appl. Opt. 37, 6615-6622 (1998)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-37-28-6615

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