Dhp Peter Maat

A compact integrated InP-based single-phasar optical crossconnect

The first integrated InP-based polarization independent optical crossconnect is reported. The device can crossconnect signals at four wavelengths independently from two input fibers to two output fibers. Total on-chip loss is less then 16 dB. Device size is 7/spl times/9 mm/sup 2/.

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.

Compact photonic integrated phase and amplitude controller for phased-array antennas

Feasibility of an extremely compact photonic integrated circuit for controlling phase and amplitude of a 16-element phased-array microwave antenna has been demonstrated experimentally.

Polarization-independent dilated InP-based space switch with low crosstalk

A polarization-independent dilated switch with a low crosstalk level has been realized. In this switch, the crosstalk signal is attenuated by using controllable electrooptical attenuators which do not disturb the input signal. A reverse bias of 20 V on the attenuators reduces the crosstalk value of the dilated switch from -32 dB to -40 dB. The excess loss of the total switch is about 9 dB.

Photonic chip for steering a four element phased array antenna

A polarization independent photonic integrated circuit for phase steering of a four element phased array antenna has been fabricated on InP. The chip is extremely small and suitable for packaging.

A chopped quantum-well polarization-independent interferometric switch at 1.53 /spl mu/m

We have theoretically designed and realized a phase shifter for a low-loss Mach-Zehnder interferometric switch. The phase shifter is based on 0.85% tensile strained InGaAs-InP chopped quantum-well material. We realized a Mach-Zehnder interferometric switch with polarization-independent switching voltages as low as 3.3/spl plusmn/0.05 V at 1525 nm for a switch with a 4-mm-long phase shifting section. The wavelength sensitivity of the switch is 0.036 V/nm for TE and 0.053 V/nm for TM polarization. Calculations of the electro-refraction in the -0.85% strained chopped quantum-well (QW) material based on the 4/spl times/4 Luttinger-Kohn Hamiltonian show that the electro-refraction due to the quantum-confined Stark effect (QCSE) for TM polarization is equal to the sum of the mutually comparable QCSE electro-refraction and the Pockels effect for TE polarization in waveguides along the [11~0] axis. Our first-principle model for calculating the electro refraction is an accurate design tool for predicting device performance in complicated layer structures. The shortest possible phase shifter with a <-25 dB crosstalk penalty due to electro-absorption unbalance can be as short as 2.2 mm. This compact switch is predicted to have a 6-V switching voltage and a 15-nm window for polarization-independent switching with a <-25-dB crosstalk penalty. With a slight increase of the strain, this chopped QW material can be used for polarization independent switching around 1550 nm.

Compact integrated polarisation-independent optical crossconnect

An extremely compact integrated polarisation independent optical crossconnect is reported. The device can crossconnect signals at four wavelength independently from two input fibres to two output fibres. Total on-chip loss is less than 16 dB, crosstalk is better than -16 dB. Device size is 6/spl times/6 mm/sup 2/. An improvement in performance compared to an earlier reported device has been achieved by using an optimised concept.

Coherent photonic integrated beamformer for phased-array antennas

The feasibility of an extremely compact photonic integrated circuit for controlling phase and amplitude of a 16-element phased-array microwave antenna has been demonstrated experimentally.

Photonic integrated beamformer for a phased array antenna

Feasibility of an extremely compact photonic integrated circuit for controlling phase and amplitude of a 16-element phased-array microwave antenna has been demonstrated experimentally.Feasibility of an extremely compact photonic integrated circuit for controlling phase and amplitude of a 16-element phased-array microwave antenna has been demonstrated experimentally. We report first experiments on an extremely compact (8.5/spl times/8 mm) integrated beam-forming network for controlling phase and amplitude of an 16-element RF phased-array antenna.

Photonic integrated beamformer for phased-array antennas

Feasibility of an extremely compact photonic integrated circuit for controlling phase and amplitude of a 16-element phased-array microwave antenna has been demonstrated experimentally.