Direct optical characterisation of DFB lasers for CPFSK system applications

17 August 1989

journal article
Published by Institution of Engineering and Technology (IET) in Electronics Letters

Vol. 25 (17) , 1108-1110
https://doi.org/10.1049/el:19890743

Abstract

We present a new optical characterisation method for single-frequency lasers that are to be applied in Gbit/s CPFSK systems. We use optical delay-demodulation to allow easy matching of the demodulator delay over a wide range of values. We show, for a particular device, that when used in a 2·4 Gbit/s CPFSK system, the modulation index must be larger than 1·0 to obtain a bit error rate below 10⁻¹¹. With a modulation index of 1·5, bit error rates below 5 × 10⁻¹³ have been measured.

Keywords

OPTICAL DELAY-DEMODULATION
OPTICAL COMMUNICATION TRANSMITTERS
CPFSK SYSTEM APPLICATIONS
DEMODULATOR DELAY MATCHING
SEMICONDUCTOR LASERS
DFB LASERS
SINGLE-FREQUENCY LASERS
BER
MODULATION INDEX
OPTICAL CHARACTERISATION METHOD
GBIT/S SYSTEMS
2.4 GBIT/S
BIT ERROR RATE

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