C.G.P. Herben

A low-loss 16-channel polarization dispersion-compensated PHASAR demultiplexer

An improved technology for realizing high-quality PHASARs is reported, which is compatible with the integration of electrooptical switches for use in add-drop multiplexers. This technology is demonstrated in a 16-channel polarization independent low loss (<2.4 dB on-chip) PHASAR.

Low-loss, compact, and polarization independent PHASAR demultiplexer fabricated by using a double-etch process

A compact low-loss polarization independent 8 /spl times/ 8 PHASAR demultiplexer is presented. Device size is 0.93 /spl times/ 0.75 mm/sup 2/. On-chip losses are less than 4 dB and crosstalk is better than -20 dB. The device is suitable for integration with electro-optical switches for application in integrated optical crossconnects, add-drop multiplexers and multiwavelength lasers.

Polarization independent dilated WDM cross-connect on InP

A four wavelength 2/spl times/2 optical wavelength-division-multiplexed cross-connect with dilated switches is reported. The device is monolithically integrated on InP and consist of two eight-channel PHASARs combined with 16 electrooptic Mach-Zehnder interferometer switches. On-chip loss is less than -17 dB and crosstalk is better than -20 dB.

Crosstalk performance of integrated optical cross-connects

Crosstalk performance of monolithically integrated multiwavelength optical cross-connects (OXCs) depends strongly on their architecture. In this paper, a semiquantitative analysis of crosstalk in 11 different architectures is presented. Two architectures are analyzed numerically in more detail and the results of the analysis show good agreement with previously reported experimental results.

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.

Dilated polarization independent WDM cross-connect on InP

A four wavelength 2/spl times/2 optical WDM-cross-connect with dilated switches is reported. The device is monolithically integrated on InP and consists of two 8-channel PHASARs combined with 16 electrooptic Mach-Zehnder interferometer switches. On-chip loss is less than -17 dB and crosstalk is better than -20 dB.

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.

InP-based optical cross-connects for WDM networks

Recent developments in WDM require devices with increasing complexity such as WDM cross-connects. Monolithic integration of these devices offers both compactness and reduction of packaging costs. Progress in the field of InP-based integrated WDM cross-connects is reviewed.