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in creator/contributor: "Goddard, L L"  
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Rapidly Reconfigurable All-Optical Universal Logic Gates

Description: We present designs and simulations for a highly cascadable, rapidly reconfigurable, all-optical, universal logic gate. We will discuss the gate's expected performance, e.g. speed, fanout, and contrast ratio, as a function of the device layout and biasing conditions. The gate is a three terminal on-chip device that consists of: (1) the input optical port, (2) the gate selection port, and (3) the output optical port. The device can be built monolithically using a standard multiple quantum well gr… more
Date: June 21, 2006
Creator: Goddard, L L; Kallman, J S & Bond, T C
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Photonic MEMS for NIR in-situ

Description: We report on a novel sensing technique combining photonics and microelectromechanical systems (MEMS) for the detection and monitoring of gas emissions for critical environmental, medical, and industrial applications. We discuss how MEMS-tunable vertical-cavity surface-emitting lasers (VCSELs) can be exploited for in-situ detection and NIR spectroscopy of several gases, such as O{sub 2}, N{sub 2}O, CO{sub x}, CH{sub 4}, HF, HCl, etc., with estimated sensitivities between 0.1 and 20 ppm on footpr… more
Date: July 3, 2007
Creator: Bond, T C; Cole, G D; Goddard, L L & Behymer, E
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

FUNCTIONALIZED LATERAL SURFACE COATED LASERS FOR CHEM-BIO DETECTION

Description: We present a class of compact, monolithic, photonic sensors consisting of multiple section edge emitting lasers with functionalized lateral surface coatings for low level detection of chemical or biological agents. Specifically, we discuss 8 {micro}m x 250 {micro}m Pd-coated H{sub 2} sensors and configurations to reduce the minimum detection limit from 138ppm for passive sensors to 1ppm for active sensors. Compared with conventional optical H{sub 2} sensors that use fiber gratings, surface plas… more
Date: July 5, 2007
Creator: Goddard, L L; Bond, T C; Cole, G D & Behymer, E M
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Electrical and Optical Gain Lever Effects in InGaAs Double Quantum Well Diode Lasers

Description: In multisection laser diodes, the amplitude or frequency modulation (AM or FM) efficiency can be improved using the gain lever effect. To study gain lever, InGaAs double quantum well (DQW) edge emitting lasers have been fabricated with integrated passive waveguides and dual sections providing a range of split ratios from 1:1 to 9:1. Both the electrical and the optical gain lever have been examined. An electrical gain lever with greater than 7 dB enhancement of AM efficiency was achieved within … more
Date: January 3, 2007
Creator: Pocha, M D; Goddard, L L; Bond, T C; Nikolic, R J; Vernon, S P; Kallman, J S et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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