Toshio Watanabe

TL;DR: In this article, a deuterated polysiloxane with high transparency and high thermal stability was synthesized for use as optical waveguide material, and single-mode channel waveguides using the polymer were fabricated by conventional photolithography and dry etching.

TL;DR: In this article, an arrayed waveguide grating (AWG) multi/demultiplexer and a digital thermooptic (TO) switch are successfully realized using the silicone resin.

Abstract: A high-numerical-aperture ( NA) optical pick-up for an optical disk was developed using a two-element lens, a thin disk substrate and a spherical aberration compensation mechanism. We designed a two-element objective lens rather than a conventional singlet objective lens in order to increase the fabrication tolerance of the objective lens for high NA. A disk substrate which is thinner than that of the digital video disk (DVD) was adopted to increase the disk tilt tolerance. A spherical aberration compensation mechanism was realized by controlling the distance between the two lenses of the objective using an actuator in order to cancel the aberration due to the variations in the disk thickness. In the experiment, we fabricated a two-element lens according to our design and confirmed that it performed as a high-quality 0.8- NA objective lens.

TL;DR: The wavelength routing switch is a promising technology for the development of 1000 × 1000 scale large port count optical switches and recent advances are demonstrated as discussed by the authors, which can increase network bandwidth and reduce power consumption while meeting the traffic requirements.

TL;DR: A 0.8 nm spacing polymeric arrayed-waveguide grating (AWG) multiplexer operating around 1550 nm using a silicone resin waveguide was proposed in this paper, with an insertion loss in the range 9-13 dB, a crosstalk of 20 dB, and a polarisation-dependent wavelength shift of 0.35 nm.