By J.E. Carroll, J.E.A. Whiteaway, R.G.S. Plumb
Targeting providing a radical research of DFB lasers from a degree compatible for study scholars, this publication emphasises and offers wide assurance of desktop aided modeling thoughts
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Additional info for Distributed feedback semiconductor lasers
5) Pleft Pright where the logarithmic term can be considered as a distributed reflector loss. 6) where N is any integer. This concept of a net round-trip complex gain, Gnund which has a value of unity for lasing, holds for all lasers and not just for FP lasers where Gwund=pMl p^ exp[(gm- am-jf3n)2L\. It is equivalent to the classic condition for oscillation in electronic feedback amplifiers  where the product of gain and positive feedback is unity. Put another way, 1/(1 - Gwund) —•infinity; giving output without input!
The abrupt changes in refractive-index, with each section of length Am/4, are purely schematic to emphasise the main features. This is the distributed-feedback (DFB) referred to earlier. However, it is found that the DFB laser oscillates at two possible frequencies slightly removed from the Bragg frequency depending on KL (Chapters 4 and 5). The reason for this is that the phase condition for oscillation cannot be met at the Bragg frequency, as discussed below. Now reconsider the DBR laser. It is found that the presence of gain enhances the reflectivity of the Bragg gratings and this increased reflectivity dramatically reduces the required gain for the FP-gain section.
6 and techniques to compensate the dispersion in the fibre caused by chirp may need to be used. Besides the need for narrow linewidths to reduce the effects of dispersion and so permit longer transmission distances, there is another commercial goal of enhancing the information capacity of optical-communication networks by transmitting different channels of communication at sets of well defined wavelengths. Such a process is called wavelength-division multiplexing (WDM) . As the channel spacing is decreased, one refers to dense WDM but at the time of writing dense WDM is still a gleam in the eye of systems' designers.