Single mode chalcogenide glass fiber as wavefront filter for the DARWIN planet finding misson

The development of single mode chalcogenide glass fibers as wavefront filter for the DARWIN mission is reported. Melting procedures and different preform techniques for manufacturing core-cladding chalcogenide fibers are described. Bulk glass samples on the basis of Te-As-Se- and high Te-compositions have been characterized optically, by...

Extension of Marcatili's analytical approach for rectangular silicon optical waveguides

Marcatili's famous approximate analytical description of light propagating through rectangular dielectric waveguides, published in 1969, gives accurate results for low-index-contrast waveguides. However, photonic-integrated circuit technology has advanced to high-index-contrast (HIC) waveguides. In this paper, we improve Marcatili's model by...

Extension of Marcatili's analytical approach for 220 nm high waveguides in SOI technology

Marcatili’s famous approximate analytical description of light propagating through rectangular dielectric waveguides, published in 1969, gives accurate results for low-indexcontrast waveguides. However, silicon-on-insulator (SOI) technology has become one of the focus platforms for integrated optics over the last decade, and the silicon...

Infrared single mode chalcogenide glass fiber for space

An important measuring technique under study for the DARWIN planet finding mission, is nulling interferometry, enabling the detection of the weak infrared emission lines of an orbiting planet. This technique requires a perfect wavefront of the light beams to be combined in the interferometer. By using a single mode waveguide before detection,...

Wavelength dependence of reflectometric cone photoreceptor directionality

We present evidence for the wavelength dependence of the directionality of light reflected from cone receptor cells (optical StilesCrawford effect): Blue light is more directional than red. According to the waveguide-scattering model of Marcos J. Opt. Soc. Am. A 15 , 2012 (1998), directionality is the sum of a waveguide component and a...

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

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

InP-based spotsize converter for integration with switching decvices

We have designed and fabricated an InGaAsP-InP based spotsize converter (SSC), which is compatible with the waveguide structure used in monolithic integrated ADM's and OXC's. In a first experiment, a total coupling loss to a cleaved fiber of 4.2 dB for TE and 3.9 dB for TM was realized with a 1.5 mm-long SSC. The 1-dB alignment tolerances...

Hybrid Coupling of Laser Light sources to Silicon (Oxy)Nitride Based Waveguides

An efficient method was developed to couple a diode laser to a high contrast waveguides. The laserdiodes were mounted with sub-micron precision using a thermocompression mounting technique. An AlGaAs (λ = 850 nm) laserdiode was coupled to a SiON based slab waveguide (efficiency η EQ 25 - 30%) and to a Si2N4 based ridge waveguide (efficiency η =...