By J.E. Carroll, J.E.A. Whiteaway, R.G.S. Plumb
Focusing on featuring an intensive research of DFB lasers from a degree compatible for learn scholars, this booklet emphasises and offers large assurance of desktop aided modeling concepts
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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.
In a conventional Fabry-Perot laser, the light comes out equally from both facets. 10). This can be achieved through the use of a high-reflectivity coating on the rear facet and a reduced-reflectivity coating on the front (high-low facet coatings) . The product of the two field reflectivities (plefl pright) is approximately the same as in an uncoated laser, so that the net feedback and gain required for oscillation (eqn. 5) are retained at about the same level. 11a) is an interesting device [27, 31] where, by varying the external cavity's dimensions and the reflectivity of the laser facet emitting into the cavity, conditions can be 14 Distributed feedback semiconductor lasers optimised for very narrow-line ( R. : 'Analysis of gratingcoupled radiation in GaAs:GaAlAs lasers and waveguides', IEEE J. , 1976, 12, pp. D. GaAlAs lasers and waveguides-II: Blazing effects', IEEEJ. , 1976, 12, pp. R. : 'TM-mode coupling coefficients in guided-wave distributed feedback lasers', IEEEJ. , 1976, 12, pp. 74-78 46 KOGELNIK, H. : 'Coupled-wave theory of distributed feedback lasers',/. , 1972, 43, pp. , SOMEKH, S. : 'Laser oscillation in epitaxial GaAs waveguides with corrugation feedback', Appl Phys. Lett, 1973, 23, pp.
R. : 'Analysis of gratingcoupled radiation in GaAs:GaAlAs lasers and waveguides', IEEE J. , 1976, 12, pp. D. GaAlAs lasers and waveguides-II: Blazing effects', IEEEJ. , 1976, 12, pp. R. : 'TM-mode coupling coefficients in guided-wave distributed feedback lasers', IEEEJ. , 1976, 12, pp. 74-78 46 KOGELNIK, H. : 'Coupled-wave theory of distributed feedback lasers',/. , 1972, 43, pp. , SOMEKH, S. : 'Laser oscillation in epitaxial GaAs waveguides with corrugation feedback', Appl Phys. Lett, 1973, 23, pp.