B. Thedrez

Experimental demonstration of nonreciprocal amplified spontaneous emission in a CoFe clad semiconductor optical amplifier for use as an integrated optical isolator

Experimental results are presented for an integrated-optical-waveguide-isolator concept. This concept is based on inducing the transverse magneto-optic Kerr effect in a semiconductor InP-based optical amplifier (SOA) by using a transversely magnetized ferromagnetic metal as an electrical contact. As a result, the SOA exhibits nonreciprocal loss/gain for TM polarized light and is easily monolithically integrated with other InP-based active photonic devices. We have designed, fabricated and characterized prototype ferromagnetic metal-clad optical amplifiers for an operation wavelength of 1300nm. In these first generation devices we obtained isolation strengths of up to 2.0dB∕mm.

First experimental demonstration of a monolithically integrated InP-based waveguide isolator

Abstract The architect should be equipped with knowledge of many branches of study and varied kinds of learning. This knowledge is mainly constructed by means of practice and theory (Vitrivius, 1914). Architectural education is considered to be a complex process. Its creative demands must be supported by an understanding of art, science, psychology, mathematics, engineering and etc. The design studio has long been the major component of architectural education. Traditionally it has involved a relatively small group of students under the direction of a studio master, and an instructor. This paper analyzes the characteristics of traditional studio environments, compares it with the constructivist studio in general and recommends a transformation in the design studio.

Study of a Magnetooptic Contact for an Amplifying Waveguide Optical Isolator

We report on the development of an ohmic metal-semiconductor contact for application in an amplifying waveguide optical isolator. It is the result of magnetooptic waveguide simulations combined with experimental extraction of the contact resistivity. The optimized contact scheme is a p⁺⁺-doped hybrid In_0.81Ga_0.19As_0.41P_0.59-In _0.53Ga_0.

Polarization insensitive 40 GHz self-pulsating DBR lasers with enhanced nonlinearities and wide self-pulsation frequency tunability

d4₇As structure, a compromise between good isolating performance and good electrical behavior

Low switching energy saturable absorber device for 40Gbit/s networks

40 GHz self-pulsating distributed Bragg reflector lasers with a polarization insensitive bulk active layer of 0.7/spl times/0.5 /spl mu/m/sup 2/ showed enhanced non-linear behavior at low power level, and nearly 1 GHz of continuous self-pulsation frequency tunability using two active sections.

Realisation of semiconductor optical amplifiers with homogeneous carrier density and low noise factor

All-optical regeneration devices based on semiconductor microcavity have been designed with different numbers of quantum wells inside. The switching energy is strongly dependent of the quantum well number.

Magneto-optic Contact for Application in an Amplifying Waveguide Optical Isolator

Buried ridge hetero-structure with p-n blocking layers semiconductor optical amplifiers have been designed and fabricated. Noise figure as low as 6.5 dB has been obtained in the case of low spatial hole burning, by optimising the confinement factor.

Saturable absorber based micro-cavity for broadband wavelength conversion

We present the development of a metal-semiconductor contact for a TM-mode amplifying waveguide optical isolator and show that it is a compromise between good (magneto-)optical performance and good electrical behavior

Low cost 1300 nm edge emitter laser

Saturable absorber comprised inside a suited micro-cavity has been fabricated and characterized through a dynamic wavelength conversion experiment. Wavelength conversion is observed within a 40nm bandwidth, and is effective within a 15nm bandwidth.

Giant linewidth enhancement factor and purely frequency modulated emission from quantum dot laser

While optics has proven to be the most practical response to the high traffic rate demand for long haul transmission, its extension to the metropolitan networks down to the home remains an open challenge. Implementation of optics at transmission rate where other technical solutions exist requires cost reduction and simplified manufacturing fabrication. It also requires utilizing the already existing fiber cable networks. Lasers emitting at 1300 nm are well suited for this task and have the potential for responding to the market demand up to several GHz repetition rate. Several steps towards low cost fabrication have already been undertaken: improving the laser resistance to temperature fluctuation in order to remove temperature control elements; improving the laser beam quality to use cheaper or no optics; developing mounting process compatible with passive alignment to a fiber; designing feedback resistant lasers to eliminate the need for optical isolators; reducing the number of selection test during fabrication. We review the recent progress in all these areas and conclude on the future directions and challenges.