Novel square-law demodulator for use in coherent ASK/FSK heterodyne optical receivers

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Novel square-law demodulator for use in coherent ASK/FSK heterodyne optical receivers

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A novel square-law demodulator with low input power requirements has been developed for use in ASK/FSK heterodyne optical receivers. 10"9 BER sensitivity better than-29dBra was achieved for a 648Mbit/s ASK signal with carrier scanned from 1 to 4GHz. The flatness of the responsivity was better than ± 1 dB over the same input bandwidth.

Inspec keywords: optical communication equipment; receivers; frequency shift keying; amplitude modulation; demodulators

Other keywords: square-law demodulator; 648 Mbit/s; low input power requirements; 4 GHz; ASK signal; coherent ASK/FSK heterodyne optical receivers; sensitivity; 1 to 4 GHz

Subjects: Modulators, demodulators, discriminators and mixers; Optical communication; Modulation and coding methods

References

    1. 1)
      • T. Okoshi , K. Kikuchi . (1988) , Coherent optical fiber communication.
    2. 2)
      • I. Garrett , G. Jacobsen . Theory for heterodyne optical ASK receivers using square-law detection and postdetection filtering. IEE Proc. J , 5 , 303 - 312
    3. 3)
      • I. Bahl , P. Bhartia . (1988) , Microwave solid state circuit design.
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