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Spectral gain studies were carried out for two different laser diode structures from the recordings of Fabry-Perot modes. The Cassidy method [1] was found to be superior to other methods for determining gain and for application even at laser threshold. Maximum gain versus current values were derived for both AlGaAs/ GaAs and InGaAsP/InP lasers, and showed good agreement with published theoretical values [2, 3].
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Mengel, F.: `Experimental investigation of semiconductor lasers for optical fibre communications', 1978, Ph.D. thesis, .
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C.H. Henry ,
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Garrett, B., Glew, R.W., Thrush, E.J., Whiteaway, J.E.A.: `Design, fabrication and characterisation of (AlGa)As/GaAs multi-quantum well, separately confined heterostructure lasers grown by MOCVD', Digest No. 128, IEE Colloquium Multi-quantum well devices — physics, engineering and applications, 1986, London, United Kingdom, p. 7/1–6.
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