Ibaraki, Japan
Ibaraki, Japan

Time filter

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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.


Okamoto K.,AiDi Corporation | Ishida K.,AiDi Corporation
Optics Letters | Year: 2013

Silicon reflection-type arrayed-waveguide gratings (AWGs) consisting of all straight array waveguides are experimentally demonstrated for the first time to our knowledge. The AWG has 14 output channels with 400 GHz channel spacing and a footprint of 230 μm × 530 μm. The minimum on-chip loss of 3.0 dB and crosstalk of -20 dB are achieved by using a second-order distributed Bragg reflector facet. © 2013 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.


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.


Patent
Aidi Corporation | Date: 2010-02-23

A transform spectrometer implemented on a planar waveguide circuit (PLC), having an input optical signal waveguide carrying an input optical signal to be analyzed; a plurality of couplers, each connected to the input optical signal waveguide, and each including a coupler output for carrying a coupled optical signal related to the input optical signal. An array of interleaved, asymmetrical waveguide Mach-Zehnder interferometers (MZI) is formed on the PLC, each having at least one input MZI waveguide, each MZI input waveguide receiving a coupled optical signal from a respective coupler output; wherein at least some of the input MZI waveguides intersect in a common layer of the PLC, at an angle which allows their respective coupled optical signals to transmit without unacceptable attenuation. This arrangement improves spatial efficiency of the PLC, allowing more MZIs to be implemented, resulting in increased spectral resolution.


Arrayed waveguide grating (AWG) circuits are disclosed, having different radii in the slab regions to supplement and/or replace other mechanical techniques which enable athermal AWGs. Dual band, interleaved pairs of athermal AWGs are also disclosed, with improved cost, space and center wavelength properties, for, e.g., optical line terminal (OLT), and remote node (RN) applications.


A transform spectrometer measurement apparatus and method for a planar waveguide circuit (PLC). The spectrometer typically includes an input optical signal waveguide carrying an input optical signal; a plurality of couplers, each connected to the input optical signal waveguide, and each including a coupler output for carrying a coupled optical signal related to the input optical signal; and an array of interleaved, waveguide Mach-Zehnder interferometers (MZI), each having at least one input MZI waveguide, each MZI input waveguide receiving a coupled optical signal from a respective coupler output. A phase shifting circuit is applied to at least one arm of the MZIs to induce an active phase shift on the arm to thereby measure phase error in the MZIs. Light output from the MZIs is measured under intrinsic phase error conditions and after an active phase shift by the phase shifting circuit.


A silicon photonics array waveguide grating (AWG), and methods of their manufacture, including a plurality of silicon photonics array waveguides running from at least one of an input and output slab waveguide region, wherein first sections of each of the plurality of array waveguides have a first core geometry; and second sections of each of the plurality of array waveguides have a second core geometry. The first and second core geometries may comprise different waveguide core widths, and/or different core structures. AWG temperature stability is provided by the techniques of the present invention.

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