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50 Mbps optical homodyne communication receiver with a photorefractive optical beam combiner

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3 Author(s)
Davidson, F. ; Dept. of Electr. & Comput. Eng., Johns Hopkins Univ., Baltimore, MD, USA ; Field, C. ; Sun, X.

Performance measurements are reported for a coherent homodyne optical communication receiver that contained an iron-doped indium phosphide photorefractive beam combiner, rather than a conventional optical beam splitter. The system attained a bit error probability of 10/sup -6/ at received signal powers corresponding to about 75 detected photons per bit. No precision beam alignment or mode-matching optics were required, and tracking of slow phase changes between signal and local-oscillator light was performed automatically by the dynamic nature of the photorefractively formed refractive-index grating. The system used phase-modulated Nd:YAG laser light at lambda =1.06 mu m.<>

Published in:

Photonics Technology Letters, IEEE  (Volume:4 ,  Issue: 11 )

Date of Publication:

Nov. 1992

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