By Deborah M. Kane, K. Alan Shore
Purposes of semiconductor lasers with optical suggestions structures are riding fast advancements in theoretical and experimental examine. The very large wavelength-gain-bandwidth of semiconductor lasers mixed with frequency-filtered, robust optical suggestions create the tunable, unmarried frequency laser structures utilised in telecommunications, environmental sensing, dimension and keep watch over. people with susceptible to reasonable optical suggestions result in the chaotic semiconductor lasers of non-public conversation. This source illustrates the range of dynamic laser states and the technological purposes thereof, proposing a well timed synthesis of present findings, and delivering the roadmap for exploiting their destiny capability.
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Extra resources for Unlocking Dynamical Diversity: Optical Feedback Effects on Semiconductor Lasers
These rate equations require that the dynamic change in the complex propagation constant, k, is small, that is, kl 1, where l is the laser diode cavity length. This condition is violated for the coherence collapse state at moderate to high feedback levels. Analysis using Lang–Kobayashi type rate equations has included work on multimode operation up to and including coherence collapse state . Rate equations have also been used to study the properties of modulated laser diodes subject to weak optical feedback in both the multimode  and single mode [26, 27] cases.
The second term in the E-field equation accounts for amplification through stimulated emission, quantified by the optical gain term G n , and for attenuation due to the cavity losses, 0 . The final term in the E-field equation is the important addition made by Lang and Kobayashi: the inclusion of the effect of the feedback of a time-delayed proportion of the optical field. 2) in and the transit time of the light through the external cavity is . e. small values of ) where the contribution to the E-field rate-equation from the second and subsequent round trips can be ignored.
Olesen, ‘Stability analysis for a semiconductor laser in an external cavity’, IEEE J. Quant. , QE-20, 1023–1032 (1984).  B. Tromborg, H. Olesen, X. Pan and S. Saito, ‘Transmission line description of optical feedback and injection locking for Fabry-Perot and DFB lasers’, IEEE J. Quant. , QE-23, 1875–1889 (1986).  H. H. Osmundsen and B. Tromborg, ‘Nonlinear dynamics and spectral behaviour for an external cavity semiconductor laser’, IEEE J. Quant. , QE-22, 762–773 (1986). H. F. Kazarinov, ‘Instability of semiconductor lasers due to optical feedback from distant reflectors’, IEEE J.