Kouhei Ogura

Narrow Tunable Polysilane Optical Waveguide Bragg Grating Filters

A new Bragg grating filter (BGF) in a polysilane waveguide has been fabricated by a two-beam interferometric photobleaching method using a He-Cd laser. A narrow reflected bandwidth of 0.4 nm was measured using a 1.55-mum light-emitting diode. The temperature dependence of the BGF was measured as 0.096 nm/degC with temperature control over a range between 30 degC and 70 degC and exhibited a good coincidence with the theoretical values

Polysilane-based 3D waveguides for optical interconnects

We have been developing the optical waveguide for the multimode using the photo-bleaching property of polysilane. The refractive index of polysilane can be easily changed by exposing to UV light as photobleaching. Using this property, we can make waveguide with simple processes as spin coating, exposing and annealing. We found that this waveguide has thermal adhesive property with glass substrate. And we applied this feature to fabricate multilayered optical waveguides that have three-dimensional structure and can change the optical light at right angle.

Narrow band and tunable filters of a polysilane optical waveguide grating for OADM

A tunable Bragg grating filter with a reflected bandwidth of 0.7 nm and a wavelength shift to temperature change of 0.1 nm//spl deg/C in the polysilane waveguides has been fabricated by a two-beam interference photobleaching method with a He-Cd laser.

Vibration sensing with very thin optical taper fibers

A very thin taper fiber has been produced for a vibration sensing. Frequency characteristics of the sensor up to 2000Hz are measured and the possibility for optical remote sensing a an acceleration measurement tools is discussed.