Semiconductor mirror for optical noise suppression and dynamic dispersion compensation

Carbon nanotubes for ultrafast fibre lasers

“…Most commonly used material SAs are the III-V group binary and ternary semiconductors in the form of multiple quantum wells (MQW), grown on a distributed Bragg reflector [23,27,28]. These are so-called semiconductor saturable absorber mirrors (SESAMs).…”

Phase response characterization of semiconductor saturable absorber for applications in nonlinear optical signal processing and phase-modulated signals regeneration

“…In order to improve the features of the device, the nonlinear model can be exploited to optimize the design of the cavity in order to shape its properties in terms of useful bandwidth, minimized residual amplitude variations, linearity of the phase response, operating power levels and thermal effects. In general, the intensity-dependent phase response of nonlinear cavity, can be of interest for several applications in the field of optical communication systems [1][2][3][4], including dynamic dispersion compensation, compensation of nonlinear effects in fiber propagation, and optically controllable photonic phase shifter and delay lines.…”

“…Recently, a nonlinear phase shifter has been demonstrated in a vertical cavity surface emitting laser (VCSEL) active structure, acting as a vertical-cavity saturable absorber [1], [2]. Other previous woks also investigated both theoretically and experimentally the dispersion compensation properties of a passive asymmetric non-linear Fabry-Perot cavity exploiting saturation of absorption for applications like ultra-fast laser generation [3] or for dynamic dispersion compensation in telecom systems [4]. Here, we present experimental results of the measurements relative to the phase response of a similar passive nonlinear micro-cavity incorporating a semiconductor saturable absorber, and by means of numerical analysis we investigate its possible application for signal processing application, including optical regeneration of phase modulated signals.…”

All-Optical Processing for Pulse Position Coded Header in Packet Switched Optical Networks Using Vertical Cavity Semiconductor Gates

“…Thus, for a given R t , IM condition is satisfied for a particular value of the signal energy. IM gates that have ideally no reflection at the resonant wavelength for weak input powers [i.e., α = α 0 , neglecting the nonsaturable term in (2)] can be particularly attractive in noise suppression applications [11]. However, when the reflectivity of the top mirror is higher than the round-trip losses associated with unsaturated absorption (R t > R b exp(−2α 0 d)), the cavity impedance can be matched only by using an input optical field that partially saturates the absorption to satisfy the condition given by (3).…”