U Uzma Khalique

Ultrashort polarization converter on InP/InGaAsP fabricated by optical lithography

A compact, ultra short, integrated polarization converter has been fabricated by optical lithography. Length of the converter is 125 μm, and 325 μm including tapers. Conversion efficiency is higher than 95% and loss is less than 1 dB.

Use of polarization in InP-based integrated optics

The development of integrated polarization manipulating devices opens the perspective on the use of polarization as a new design dimension in InP-based integrated optics. Examples will be given of how this results in additional functionalities.

Polarization converters on double hetero structures containing strained quantum wells

The importance of polarization manipulation is increased as optical fiber systems evolve to higher data rates. Photonic integrated circuits should be insensitive to the state of polarization of the light emanating from fibers if they are to be used as detectors, add-drop mutiplexers or cross connects. Either all the integrated components have to be polarization independent or only one polarization direction should be used. For either method, a compact polarization converter is useful. A model is developed for the mode propagation in the waveguide of the slanted side polarization converter based on double hetero structures. The model is extended to include polarization dependent absorption and mismatch. Polarization converters on different double heterostructures (with and without quantum wells) have been designed and are realized by contact optical lithography. The performance of the realized converters is well described with the model.

Polarization manipulation in photonic integration on indium phosphide

The possibility to manipulate polarization in a Photonic Integrated Circuit (PIC) gives new design options. This will be illustrated with POLIS, an integration scheme based on polarization. Also the polarization manipulating devices will be introduced.