FSK heterodyne system experiments at 1.5 μm using a DFB laser transmitter

Mogensen, F.; Hodgkinson, T.G.; Smith, David W.

doi:10.1049/el:19850366

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Demodulation Of Optical Fsk Signals the Type Of Intermediate1

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1986

1989

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“…This requires less receiver bandwidth but sacrifies 3 dB in signal power. Single filter detection FSK has been demonstrated at 100 Mbit / s [13], 140 Mbit / s [27], 280 Mbit / s [28] , and 560 Mbit / s [6].…”

Section: Demodulation Of Optical Fsk Signals the Type Of Intermediatementioning

confidence: 99%

FSK heterodyne transmission experiments at 560 Mbit/s and 1 Gbit/s

Vodhanel

Gimlett

Cheung³

et al. 1987

J. Lightwave Technol.

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Optical frequency-shift-keying (FSK) signals are obtained from directly modulated distributed feedback (DFB) semiconductor lasers. Experimental studies of the direct frequency modulation (FM) characteristics of the DFB lasers show a nonuniform FM response due to the competing effects of thermal modulation of the laser active region and carrier density modulation. Equalization of the signal current to the laser is employed to produce a flat FM response from 30 kHz to 1 GHz. Optical FSK transmission and heterodyne detection experiments at 560-Mbit/s and 1-Gbit/s are conducted at a wavelength of 1497 nm. Receiver sensitivities of -39 dBm at 560 Mbit/s and -37 dBm at 1 Gbit/s are obtained. Transmission through 100 km of singlemode fiber at 1 Gbit/s is achieved with no degradation in receiver sensitivity.

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