DocumentCode :
1849755
Title :
Performance analysis of a heterodyne lidar system incorporating a multimode optical waveguide receiver
Author :
Duncan, Bradley D. ; Mark, Martin B. ; McManamon, Paul F.
Author_Institution :
Center for Electro-Opt., Dayton Univ., OH, USA
fYear :
1993
fDate :
24-28 May 1993
Firstpage :
1133
Abstract :
A theoretical/numerical performance analysis of a heterodyne lidar system incorporating a multimode optical waveguide receiver has been performed. The performance parameters of interest are the coupling and mixing efficiencies of the lidar receiver, as they relate to the overall system carrier to noise ratio (CNR). The coupling efficiency relates the ability of the lidar receiver optics to couple light returning from a distant object into the multimode optical waveguide receiver. The energy thus received is then mixed with a local oscillator (LO) field in an evanescent wave coupler to generate the desired intermediate frequency (IF) signal current. The efficiency with which this mixing occurs is very strongly influenced by the receiver waveguide geometry, and thus the constituent modal structures of the guided LO and signal beam fields. Initial results indicate that for a symmetric square waveguide supporting seventy-five distinct modes, the coupling and mixing efficiencies can approach 78% and 23%, respectively. These results rival the performance characteristics of many free space and single mode waveguide lidar receiver designs, while higher efficiencies are expected for more realistic multimode waveguides supporting many more modes, and for lidar receivers constructed from circular (possibly graded index) multimode optical fiber waveguides
Keywords :
demodulation; optical couplers; optical fibres; optical radar; optical receivers; optical waveguide components; optical waveguide theory; 23 percent; 78 percent; coupling efficiencies; evanescent wave coupler; graded index waveguide; heterodyne lidar; intermediate frequency signal current; local oscillator; mixing efficiencies; multimode optical waveguide receiver; multimode waveguides; performance analysis; symmetric square waveguide; theoretical/numerical performance analysis; Laser radar; Optical coupling; Optical mixing; Optical noise; Optical receivers; Optical surface waves; Optical waveguide theory; Optical waveguides; Performance analysis; Signal to noise ratio;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Aerospace and Electronics Conference, 1993. NAECON 1993., Proceedings of the IEEE 1993 National
Conference_Location :
Dayton, OH
Print_ISBN :
0-7803-1295-3
Type :
conf
DOI :
10.1109/NAECON.1993.290783
Filename :
290783
Link To Document :
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