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Transmission of QPSK signals using unisolated DFB lasers

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4 Author(s)
Woodward, S.L. ; Crawford Hill Lab., AT&T Bell Labs., Holmdel, NJ, USA ; Swaminathan, V. ; Bodeep, G.E. ; Singh, A.K.

We have investigated the use of uncooled and unisolated 1.3 μm DFB lasers in a QPSK transmission system. Our measurements include both BER measurements and detailed analog tests on two commercial DFB lasers in cylindrical packages. Error-free transmission was observed even in the presence of back reflections as large as -8 dB. The laser relative intensity noise (RIN) was measured as a function of temperature and back reflection. The change in RIN in the temperature range -10/spl deg/C to +60/spl deg/C was less than that due to back reflections, suggesting that error-free QPSK transmission can be acheived over a large temperature range with these DFB lasers.

Published in:

Photonics Technology Letters, IEEE  (Volume:8 ,  Issue: 1 )