T. Van Caenegem

Experimental demonstration of all-optical regeneration using an MMI-SOA

A novel all-optical 2R regenerator based on a multimode interference coupler (MMI) semiconductor optical amplifier is presented. Static measurements of the transfer function reveal a digital transfer characteristic and a high increase in extinction ratio. The experiments are in good agreement with simulations, which have been done using a modified beam propagation method program. The device has a high tolerance to the MMI length. It has been fabricated in an all-active layout, avoiding the need for active/passive integration and is very compact.

Experimental demonstration of 15 dB extinction ratio improvement in a new 2R optical regenerator based on an MMI-SOA

All-optical regeneration has been demonstrated for the first time using a 2/spl times/2 MMI-SOA, showing a digital-like transfer characteristic and an output extinction ratio of 22 dB for an input extinction ratio of 7 dB.

A novel 2R regenerator based on an asymmetric Mach-Zehnder interferometer incorporating an MMI-SOA

We propose a novel type of 2R regenerator, based on a Mach-Zehnder interferometer (MZI) with an SOA in one arm and a multi-mode-interference-coupler (MMI)-SOA in the other arm, which shows an improved regeneration characteristic compared to interferometers with 2 identical SOAs. The experimental results agree very well with the simulations. The measured static transfer function shows a digital form and a large increase in extinction ratio. An input extinction ratio of 6 dB can be improved to over 20 dB.

Elimination of crosstalk in the common output amplifier of a multi-wavelength source by gain clamping

We realized a multiwavelength laser using a hybrid integration technology. Simultaneous laser operation of four wavelength channels could be obtained. To avoid signal cross talk, a novel approach to clamp the gain of the common amplifier is demonstrated.

Demonstration of multi-wavelength laser with a gain-clamped output amplifier

We proposed a new approach to reduce the thermal crosstalk problem and to avoid crosstalk in the output amplifier of a multi-wavelength laser based on the gain-clamping principle. The device was realised, using the hybrid coupling technique, and the gain-clamping was experimentally verified.

InGaAsP-InP 1.55 /spl mu/m lasers with integrated mode expanders using fiber-matched leaky waveguides

We have successfully demonstrated a novel InGaAsP mode-expanded MQW laser based on the adiabatic transformation of the laser rib mode into a fiber-matched ARROW waveguide. The fabrication is drastically simplified to one planar growth step and one conventional non-critical etch step. Efficient mode transformation and considerable reduction of the horizontal and vertical far-field FWHM have been achieved.