Transmission/Reflection Filter For Double Sideband IR Waveguide Modulators

R. T. Brown; P. K. Cheo; R. S. Eng

doi:10.1117/12.960224

18 February 1989 Transmission/Reflection Filter For Double Sideband IR Waveguide Modulators

R. T. Brown, P. K. Cheo, R. S. Eng

Proceedings Volume 0999, Laser Radar III; (1989) https://doi.org/10.1117/12.960224
Event: O-E/Fiber LASE '88, 1988, Boston, MA, United States

Abstract

For 10.6 μm laser radar systems which utilize a double sideband modulator as a local oscillator frequency shifter in the receiver section, it is necessary to remove the carrier signal and the unwanted sideband signal prior to routing the frequency-shifted radiation to the heterodyne detector. This paper discusses the use of a reflective-mode Fabry-Perot etalon in conjunction with an optical duplexer to remove the carrier signal. The duplexer is a thin-film polarizer together with a quarter-wave plate. Since the sideband-to-carrier power out of the modulator is typically a few percent, it is imperative that mirror surface error and finite coating reflectivity be properly accounted for in order to achieve an adequate filter design. A rejection ratio corresponding to 20 dB between the laser carrier and the sideband was measured for the present design.

Citation Download Citation

R. T. Brown, P. K. Cheo, and R. S. Eng "Transmission/Reflection Filter For Double Sideband IR Waveguide Modulators", Proc. SPIE 0999, Laser Radar III, (18 February 1989); https://doi.org/10.1117/12.960224

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