TY - GEN
T1 - Relaxation-oscillation-free semiconductor laser with optical feedback
AU - Lenstra, D.
PY - 2014
Y1 - 2014
N2 - Semiconductor lasers often make use of external optical feedback, for various reasons, like single-mode selection, stabilization or linewidth narrowing. A draw-back of such method is that delayed feedback can easily lead to sustained relaxation oscillations (RO). The occurrence of the RO is sensitive to, among other things, the applied settings of the phase of the feedback light. It is known from early studies that the onset of ROs already occurs with weak feedback. However, the onset of ROs is shifted to higher feedback strengths under resonance conditions, i.e. when the product of RO-frequency and external delay time equals an integer. This finding was based upon certain numerical and analytical considerations, but no simple explanation was given. From a theoretical analysis based on the Lang and Kobayashi equations, the existence of RO-free bias-current intervals of substantial width will be demonstrated for realistic pumping values, irrespective of the feedback phase. It will be shown that for conventional semiconductor lasers with weak optical feedback under RO-resonance condition the laser with feedback behaves as if no feedback is present. Therefore, under these conditions the RO is damped, hence will be suppressed. This result is valid in the regime of sufficiently weak feedback, such that the RO frequency is not deviating significantly from its value in the solitary laser and is supported by calculations of the RIN spectrum. © (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
AB - Semiconductor lasers often make use of external optical feedback, for various reasons, like single-mode selection, stabilization or linewidth narrowing. A draw-back of such method is that delayed feedback can easily lead to sustained relaxation oscillations (RO). The occurrence of the RO is sensitive to, among other things, the applied settings of the phase of the feedback light. It is known from early studies that the onset of ROs already occurs with weak feedback. However, the onset of ROs is shifted to higher feedback strengths under resonance conditions, i.e. when the product of RO-frequency and external delay time equals an integer. This finding was based upon certain numerical and analytical considerations, but no simple explanation was given. From a theoretical analysis based on the Lang and Kobayashi equations, the existence of RO-free bias-current intervals of substantial width will be demonstrated for realistic pumping values, irrespective of the feedback phase. It will be shown that for conventional semiconductor lasers with weak optical feedback under RO-resonance condition the laser with feedback behaves as if no feedback is present. Therefore, under these conditions the RO is damped, hence will be suppressed. This result is valid in the regime of sufficiently weak feedback, such that the RO frequency is not deviating significantly from its value in the solitary laser and is supported by calculations of the RIN spectrum. © (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
U2 - 10.1117/12.2034112
DO - 10.1117/12.2034112
M3 - Conference contribution
T3 - Proceedings of SPIE
SP - 89800A-1-7
BT - Physics and Simulation of Optoelectronic Devices XXII, 3-6 February, 2014, San Francisco, US
A2 - Witzigmann, B.
A2 - Osinski, M.
A2 - Henneberger, F.
A2 - Arakawa, Y.
PB - SPIE
CY - Bellingham
T2 - Physics and Simulation of Optoelectronic Devices XXII
Y2 - 3 February 2014 through 6 February 2014
ER -