Lh Spiekman

Novel compact polarization converters based on ultra short bends

A novel integrated polarization converter based on ultra short bends is presented, which has a potential for low loss and small device size. A conversion value of 85% was experimentally measured with excess loss of 2.7 dB and overall dimensions of 975/spl times/83 /spl mu/m. Also 45% conversion was measured with extremely low excess loss of 0.4 dB for a device size of 760/spl times/86 /spl mu/m.

A compact nine-channel multiwavelength laser

A phased-array-based multiwavelength laser has been realized on a chip area of 3.5/spl times/2.5 mm/sup 2/. The device has nine channels, spaced at 400 GHz around a central wavelength of 1.55 /spl mu/m. Its performance is characterized by a minimum threshold current of 101 mA, a maximum fiber-coupled power of 0.37 mW, and a linewidth of 21 MHz. In addition, simultaneous four-channel operation is demonstrated.

Design and realization of polarization independent phased array wavelength demultiplexers using different array orders for TE and TM

A method for designing polarization independent phased-array wavelength demultiplexers, using different array orders for TE and TM, is described and analyzed with respect to fabrication variations. Flattening of the wavelength response is shown to improve fabrication tolerances. A four channel phased-array wavelength demultiplexer with at least 0.2 nm of polarization independent flattened response for each channel (spacing 1 nm) has been made with an insertion loss of 1.5-3 dB and a crosstalk of -17 to -19 dB.

Experimental assessment of the reflection of passive multimode interference couplers

Integration of semiconductor amplifiers in integrated optical circuits is presently possible. Reflections inside these circuits are undesirable for they can cause unwanted oscillations. The reflection properties of integrated passive multimode interference (MMI)-couplers have been experimentally determined.

A COMPACT PHASED ARRAY BASED MULTI-WAVELENGTH LASER

Wavelength Division Multiplexing (WDM) is widely regarded as a promising option to increase the bandwidth and flexibility of broadband optical communication systems. In such systems, multi wavelength laser sources [I], both for selectable single wavelength and simultaneous multiple wavelength operation, will be important components.

FIRST POLYMERIC PHASED ARRAY WAVELENGTH DEMULTIPLEXER OPERATING AT 1550 nm

Wavelength Division Multiplexing (WDM) is widely seen as the next step in broadband optical communications. Essential for WDM systems is the availability of low loss wavelength routers. The Phased Array wavelength demultiplexer [1] has been established as the preferred component for this function.

Novel Compact InP-based polarisation converters using ultra short bends

A novel type of polarisation converter has been realised using deeply etched narrow InP-InGaAsP ridge waveguide bends with small bending radius. It combines low loss (2.7 dB) with compact device size (975*83 mu m) and high polarisation conversion (>85%). It is realized using curved waveguides with small bending radii. Strong polarization conversion (>85%) is measured with excess loss of only 2.7 dB