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Fabrication and performance characteristics of two-section distributed feedback lasers operating at 1.55 mu m are presented. Using this type of laser, a 622 Mbit/s incoherent frequency-shift-keying system over a 40 km fibre has been demonstrated with a receiver sensitivity of -41 dBm at a BER of 10/sup -9/.<<ETX>>
The design, fabrication and characterisation of an all polarisation maintaining fibre coherent hybrid at lambda =1.55 mu m utilising a polarisation splitter coupler and a 3 dB coupler tree is reported. The compact packaged coupler-based hybrid exhibits low excess insertion loss (less than 0.6 dB), wide operation-bandwidth (greater than 100 nm) and high polarisation crosstalk ratio. Stable operation...
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