Abstract

Frequency Division Multiplexing (FDM) techniques are expected to play an important role in future optical broadband communication systems.1 Good selectivity can be obtained in high- density FDM systems with heterodyne receiver configurations, and the use of optical amplifiers allows one to compensate for system losses. However, in heterodyne systems with optical amplifiers, the Local Oscillator-spontaneous emission (LO-sp) beat noise may limit the number of channels, particularly at high bit rates. The introduction of an Image Rejection Receiver (IRR) configuration will halve the LO-sp beat noise2,3 thereby doubling the dynamic range and thus doubling the number of channels which can be transmitted. The experimental verification of the reduction of LO-sp beat noise is demonstrated with a simple, all-fiber Optical Image Rejection Mixer (OIRM).4

© 1991 Optical Society of America

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References

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