K. A. McGreer

NeoPhotonics (United States)

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A. Delâge

National Research Council Canada

I. M. Templeton

Ordnance Survey

Mahmoud Fallahi

University of Arizona

J. N. Broughton

University of Alberta

R. Barber

Utility Development (United States)

F. Chatenoud

National Research Council Canada

M. Dion

Rutgers, The State University of New Jersey

J. P. Franck

University of Alberta

Zhe Sun

North China Electric Power University

D. Landheer

National Research Council Canada

Cooperative Institutions

NeoPhotonics (United States)

University of Minnesota

Lumentum (United States)

National Research Council Canada

Institute for Microstructural Sciences

National Academies of Sciences, Engineering, and Medicine

Chinese Academy of Sciences

University of Alberta

Twin Cities Orthopedics

McMaster University

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Demonstration of grating demultiplexer in GaAs/AlGaAs suitable for integration

Electronics Letters (1992)

Mahmoud Fallahi K. A. McGreer A. Delâge R. Normandin I. M. Templeton

Based on Rowland circle construction, a grating spectrometer integrated with 90° curved output waveguides was designed and fabricated in a GaAs/AlGaAs waveguide structure. By incorporating curved waveguides, a larger separation between output facets was obtained.

Demultiplexer

Waveguide

Integrated Optics

10.1049/el:19921424

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Citations (14)

A flat-field broadband spectrograph design

IEEE Photonics Technology Letters (1995)

K. A. McGreer

A planar spectrograph design is described that features a flat-field output and operates over a remarkably broad range of wavelengths. The grating facet positions are described by an iterative algorithm that ensures that light will arrive in phase at the focal point. There are no aberrations of any order at the design wavelength and aberrations near the design wavelength are simultaneously minimized. The peak intensity of the output varies less than 3 dB over a wavelength range of 1.46 to 1.64 μm. The spectrograph may be used as a demultiplexer in photonics systems using wavelength division multiplexing. The design easily accommodates hybrid integration of a linear detector array at the output.

Demultiplexer

10.1109/68.376814

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Citations (14)

Observation of the morphology of thin films of solid helium deposited from the fluid onto sapphire

Journal of Low Temperature Physics (1985)

J. P. Franck J. T. Gleeson K. Kornelsen John Manuel K. A. McGreer

Triple point

Isothermal process

Crystal (programming language)

10.1007/bf00682571

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Citations (12)

High efficiency high-speed photodetection in a monolithically integratable InGaAs/InP MQW laser structure at 1.5 μm

Electronics Letters (1993)

K. A. McGreer S. Charbonneau Mike Davies G. C. Aers D. Landheer

Time-resolved photocurrent measurements in a reverse biased InGaAs/InP ridge waveguide multiquantum well pin laser structure at 1.54 μm are reported. The pulse response of this monolithically integratable detector is ~150 ps FWHM with an internal quantum efficiency of ~100% at reverse bias voltages of ~5 V.

Photodetection

Photocurrent

Quantum Efficiency

Reverse bias

Waveguide

10.1049/el:19930185

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Citations (4)

Polarization dependence of diffraction gratings that have total internal reflection facets

Journal of the Optical Society of America A (2000)

Sergey Sadov K. A. McGreer

The total internal reflection (TIR) grating is an integrated optical diffraction grating designed to achieve high efficiency for the retrodiffracted order by use of total internal reflection twice within a groove of the grating rather than by use of metalized grooves. Numerical calculations are presented for both TE and TM polarizations of incident light. When the TIR grating was used in the -mth-order Littrow mount with m > 13, the diffraction efficiency was found to decrease linearly with 1/m. The polarization dependence of the retrodiffraction efficiency exceeds 3 dB for TIR gratings formed in silica glass (n = 1.5) but is very small for gratings with InP-based technology (n = 3.2).

Diffraction efficiency

Reflection

Ultrasonic grating

Guided-mode resonance

Electromagnetically induced grating

10.1364/josaa.17.001590

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Citations (15)

Demultiplexing 120 optical channels with an integrated concave grating with total internal reflection facets

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (1998)

K. A. McGreer Zhe Sun J. N. Broughton Michael S. Smith

The shape of the grooves of a diffraction grating can be designed to take advantage of total internal reflection. We demonstrated the effectiveness of the total internal reflection (TIR) grating numerically for the bulk optic case and experimentally for the integrated optic case. The results indicated that the efficiency of the retro- diffracted order is enhanced by about 10 dB when the TIR grating design is used in place of an echelle grating with no facet metalization. We demonstrate that a TIR grating can be integrated on a chip to demultiplex 120 optical channels that are transmitted in a dense wavelength division multiplexing (DWDM) application. The wavelengths of the channels had a 0.29 nm spacing and were within the 1550 nm wavelength band for DWDM applications.

Reflection

10.1117/12.328684

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Citations (1)

Optimization for low-loss arrayed-waveguide gratings

K. A. McGreer Calvin Ho J. Lam Liang Zhao Hao Xu

Experimental data show AWGs in which the insertion loss versus wavelength within one free spectral range follow a fourth order polynomial. Relationships among the coefficients of the polynomial are used to simplify the optimization process.

Waveguide

10.1364/ipr.2004.jwb22

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Citations (0)

Planar lightwave circuit eight-channel CWDM multiplexer with <3.9-dB insertion loss

Journal of Lightwave Technology (2005)

C.R. Doerr M. Cappuzzo L. Gomez E. Chen A. Wong-Foy

This paper describes the demonstration of an improved eight-channel coarse wavelength-division multiplexer. The fully packaged channel losses range from 2.3 to 3.9 dB, the 1-dB bandwidth is 16.3 nm, and the crosstalk is <-28dB. This silica-waveguide device could have very low cost.

Crosstalk

Channel spacing

Optical add-drop multiplexer

10.1109/jlt.2004.840029

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Citations (23)

Observation of the fcc-hcpHe4martensitic transformation morphology

Physical review. B, Condensed matter (1990)

K. A. McGreer K. R. Lundgren J. P. Franck

Visual observations were made of the morphology of the fcc-hcp transformation in bulk solid helium. These visual observations provide new insight into the dynamics of the transformation on both a macroscopic and microscopic level. Observed interactions between the interface and defects in the solid provide the most direct evidence that the transformation is martensitic. Observations of the transformation occurring by the migration of a single planar interface across the entire sample provide strong evidence that the transformation is a thermoelastic martensitic transformation. This also indicates that the samples were very likely single crystals. The single planar interfaces had a preferred orientation. Some transformations occurred in which an interface rotated around a pivot. A new model of the interface structure is presented and used to explain the above results. In this model the interface consists of an array of coupled Shockley partial dislocations. The attractive interaction of the partials is described in terms of the orientation of the Burgers vectors of adjacent partials in the array.

Interface (matter)

Diffusionless transformation

10.1103/physrevb.42.87

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Citations (6)

Advanced grating-based WDM demultiplexer

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (1997)

K. A. McGreer J. N. Broughton H. J. Hnatiuk Zhe Sun Ruth E. Cameron

Concave gratings traditionally have been based on the Rowland circle design. A grating design formalism is discussed here that allows greater flexibility than the Rowland circle design. With this formalism, a wavelength division demultiplexer (WDM) may be designed so that the passbands for the output waveguides may be tuned after the demultiplexer has been fabricated. The design considerations for these devices are discussed and are different from the design considerations for Rowland circle gratings. The design of the grating facets is discussed in detail. Experimental results show that facets using light at an angle of incidence that is nominally 45 degrees can become highly efficient due to total internal reflection.

Demultiplexer

Formalism (music)

Optical add-drop multiplexer

10.1117/12.265354

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Citations (5)