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Enhancement of optical receiver sensitivities by amplification of the carrier

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1 Author(s)
Arnaud, J.A. ; Bell Telephone Laboratories, Inc., Crawford Hill Laboratory, Holmdel, NJ, USA

The amplification before detection of the carrier of a modulated optical signal by a narrow-band quantum amplifier enhances the signal-to-noise ratio, particularly when the signal wave-front is distorted. A further improvement is obtained by using a combination of wide-band and narrow-band quantum amplifiers. The practical application of these schemes requires a degenerate regenerative ring-type amplifier capable of amplifying arbitrary transverse field configurations. Experiments show that such an amplifier with a gain of 24 dB and a bandwidth of 1 MHz is feasible. The incident beam axis can be displaced by as much as ten times the beam-waist radius without losing more than 4 dB in gain. Frequency modulation may be converted into amplitude modulation by the phase shift introduced in the carrier.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:4 ,  Issue: 11 )