Abstract
Abstract An analysis of the asymmetric response from the device facets is performed. Attention is devoted to themechanisms that make the feedbackadversely affect differential quantum efficiency in a single-mode laser. A key is obtained to the description and control of the non-linear P-I relationship in the region just above threshold (kink).I. Introduction. A systematicinvestigation of optical feedback induced effects on semiconductor laser diodes shows a variety of phenomena'; some of them are linked to symmetry properties of the system (solitary device plus feedbacksource). The emitted light is measured from both laser facets: front facet (the facet in front of the feedback source), and rear facet (the opposite one). The signal collected from the front facet is the actualcarrier of information in the system, while the signal collected from the rear facet is commonly used to monitor system performances. The symmetry of a solitarydevice, whose facets have equal reflectivity, is destroyed by the injection
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