Entity

Time filter

Source Type

Ibaraki, Japan

Cheung S.,University of California at Davis | Su T.,University of California at Davis | Okamoto K.,University of California at Davis | Yoo S.J.B.,AiDi Corporation
IEEE Journal on Selected Topics in Quantum Electronics | Year: 2014

This paper discusses design, fabrication, and characterization of a 512 × 512 arrayed waveguide grating router (AWGR) with a channel spacing of 25 GHz. The dimensions of the AWGR is 16 mm × 11 mm and is fabricated on a 250 nm silicon-on-insulator platform. The measured channel crosstalk is approximately-4 dB without any compensation for the phase errors in the arrayed waveguides. The AWGR spectrum in the arrayed waveguide grating arms were characterized by using an optical vector network analyzer. Fabrication details of obtaining low loss silicon ridge waveguides are also discussed. © 1995-2012 IEEE.


Okamoto K.,AiDi Corporation | Aoyagi H.,Gunma University | Takada K.,Gunma University
Optics Letters | Year: 2010

We describe a configuration of the integrated-optic spectrometer based on Fourier-transform spectroscopy. The original source spectrum has been successfully retrieved with 20 GHz resolution by the spectrometer implemented in a silica-based planar waveguide. © 2010 Optical Society of America.


Okamoto K.,AiDi Corporation
Laser and Photonics Reviews | Year: 2012

The paper reviews progress and future prospects of two kinds of planar waveguide devices; they are (a) silica and silicon photonics multi/demultiplexers for communications and signal-processing applications, and (b) a novel waveguide spectrometer based on Fourier transform spectroscopy for sensing applications. The paper reviews progress and future prospects of two kinds of planar waveguide devices; they are (a) silica and silicon photonics multi/demultiplexers for communications and signal-processing applications, and (b) a novel waveguide spectrometer based on Fourier transform spectroscopy for sensing applications. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Takada K.,Gunma University | Aoyagi H.,Gunma University | Okamoto K.,AiDi Corporation
Optics Letters | Year: 2011

We report that a spectrum can be retrieved with a planar waveguide spatial heterodyne spectrometer (SHS) incorporating an active phase-shift scheme, where the phase shifts are distributed around π/2. This was confirmed experimentally with an SHS that had 32 interleaved Mach-Zehnder interferometers and whose free spectral range was 625 GHz. The phase shifts ranged from 0.71 to 2.2 rad against the target of π/2 rad. © 2011 Optical Society of America.


Okamoto K.,AiDi Corporation
IEEE Journal on Selected Topics in Quantum Electronics | Year: 2014

Silicon photonics wavelength-division-multiplexing filters are important building blocks in >100 G transceivers and near future on-chip communications between many cores. This paper deals with four kinds of wavelength-division- multiplexing filters: they are, ring resonators, lattice-form filters, arrayed-waveguide gratings and planar Echelle gratings. Progress and technical challenges for these filter devices will be described. © 1995-2012 IEEE.

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