Transmission of QPSK signals using unisolated DFB lasers

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 re...

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Published in:IEEE photonics technology letters 1996-01, Vol.8 (1), p.127-129
Main Authors: Woodward, S.L., Swaminathan, V., Bodeep, G.E., Singh, A.K.
Format: Article
Language:English
Subjects:
Acoustic reflection
Bit error rate
Laser noise
Laser transitions
Noise measurement
Optical reflection
Packaging
Quadrature phase shift keying
Temperature distribution
Testing
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description 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.
doi_str_mv 10.1109/68.475801
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source IEEE Electronic Library (IEL) Journals
subjects Acoustic reflection
Bit error rate
Laser noise
Laser transitions
Noise measurement
Optical reflection
Packaging
Quadrature phase shift keying
Temperature distribution
Testing
title Transmission of QPSK signals using unisolated DFB lasers
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