Experimental investigation of stability properties for a semiconductor laser with optical feedback

Optical-Feedback Effects In Single-Mode Semiconductor Lasers: Multistability, Hysteresis, Fluctuations And Optical Chaos

“…It has been verified that in the absense of feedback (y=0) eqs. (6) lead to the correct results 14 for the lineshape of the laser light. In general it will be very difficult, if not impossible, to obtain analytic solutions to (4) - (6).…”

“…In general it will be very difficult, if not impossible, to obtain analytic solutions to (4) - (6). The two regimes of feedback for which they can be solved in closed analytic, though approximate, form are (1) nearly-coherent feedback and (2) fully-incoherent feedback.…”

“…(5) determine the feedback-induced shifts of frequency and intensity and carrier number, while the fluctuations are described by (6) . Together with (4) , they form a closed set of coupled equations.…”

“…4,5,8 -10 However, larger amounts of feedback lead to instabilities and dramatic linewidth enhancement up to a factor 1000.2,3 Theoretical studies based on coupled rate equations for the field and the carrier number have been performed in order to analyze stationary -state solutions and their stability. 1, 6,12,13 A basic assumption in these theories is that the feedback light couples back into the laser almost coherently so that the equations can be conveniently linearized.…”