Transmission of QPSK signals using unisolated DFB lasers

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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Veröffentlicht in:IEEE photonics technology letters 1996-01, Vol.8 (1), p.127-129
Hauptverfasser: Woodward, S.L., Swaminathan, V., Bodeep, G.E., Singh, A.K.
Format: Artikel
Sprache:eng
Schlagworte:
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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Zusammenfassung: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.
ISSN:1041-1135
1941-0174
DOI:10.1109/68.475801