Direct Frequency Modulation In Interferometric Systems

Denise M. Francis; Walter L. Glomb Jr.

doi:10.1117/12.959822

9 February 1989 Direct Frequency Modulation In Interferometric Systems

Denise M. Francis, Walter L. Glomb Jr.

Proceedings Volume 0989, Fiber Optic Systems for Mobile Platforms II; (1989) https://doi.org/10.1117/12.959822
Event: O-E/Fiber LASE '88, 1988, Boston, MA, United States

Abstract

This paper discusses direct frequency modulation of semiconductor lasers with a linear current ramp and its use in optical sensors. The laser diodes evaluated were the Sharp LT015, Mitsubishi 2901, the Hitachi HL8314 and HLP1400. The maximum attainable freuency deviations ranged between 20 to 50 GHz. Chirp rates ranged from 10 to 10 Hz/sec for modulation amplitudes from 5 to 15 mA and modulation frequencies from 500 Hz to 200 kHz. The upper limit for efficient direct frequency modulation was at 50 KHz. Coherence lengths from less than 1 meter to greater than 5 meters were measured from the devices. Measurements of power level, frequency deviation, and noise predict measurement of distances up to 13 meters with 0.01 cm accuracy, using conventional channel substrate planar AlGaAs lasers.

Citation Download Citation

Denise M. Francis and Walter L. Glomb Jr. "Direct Frequency Modulation In Interferometric Systems", Proc. SPIE 0989, Fiber Optic Systems for Mobile Platforms II, (9 February 1989); https://doi.org/10.1117/12.959822

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KEYWORDS

Signal to noise ratio

Frequency modulation

Semiconductor lasers

Interferometers

Interferometry

Distance measurement

Fiber optics

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