NDLI: High-extinction directional coupler switches by compensation and elimination methods

Content Provider	IEEE Xplore Digital Library
Author	Hon-Ming Mak Yanagawa, H.
Copyright Year	1983
Abstract	A conventional guided-wave optical directional coupler switch always presents a low-extinction switching property less than 30 dB. One main reason is that coupling occurs between input and output lead regions of the coupler, causing low extinction in the through switching state despite the coupling strength being very weak. Another reason may be due to the asymmetric structural designs of couplers in optical integrating circuits, making low extinction result in the cross switching state. In this paper, we propose two methods which can solve this crosstalk problem easily. One is by the compensation technique in which we design an optimum structural construction for the reversal /spl Delta//spl beta/-directional coupler switch, and for which theoretical prediction shows that infinity extinction can be achieved where the fabricated switch element gave above 36 dB extinction ratio for both the through and cross switching states. In another method, coupling effect between lead waveguides are eliminated by means of refractive index control of the waveguides. Theoretical prediction shows that if the change of refractive index /spl delta/n is greater than 3/spl times/10/sup -3/, over 60 dB extinction can result, where the fabricated switch element also gave more than 38 dB extinction in both the through and cross switching states. Fabrication error, existence of propagation loss, and stray lights due to scattering may be the causes of difference between predicted and experimental values. However, both proposed methods show evidence that it is possible to obtain an extinction ratio as high as nearly 40 dB.<>
Sponsorship	IEEE Lasers and Electro-Optics Society Optical Society of America
Starting Page	899
Ending Page	908
Page Count	10
File Size	1118657
File Format	PDF
ISSN	07338724
Volume Number	12
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-05-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Directional couplers Coupling circuits Optical switches Optical scattering Optical crosstalk Optical refraction Optical variables control Extinction ratio Optical waveguides Refractive index
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

A novel vertical directional coupler switch with switching-operation-induced section and extinction-ratio-enhanced section

Cladding layer thickness-controlled directional coupler optical switch

Design considerations for vertical delta k directional coupler

Performance of field-induced directional coupler switches

The Wavelength Sensor Using Optical Directional Coupler

A wavelength sensor by optical directional coupler

Electro-optic directional coupler switch characterization

Symmetric directional coupler switches

Broad-band high-silica optical waveguide star coupler with asymmetric directional couplers

High-extinction directional coupler switches by compensation and elimination methods

Similar Documents

A novel vertical directional coupler switch with switching-operation-induced section and extinction-ratio-enhanced section

Cladding layer thickness-controlled directional coupler optical switch

Design considerations for vertical delta k directional coupler

Performance of field-induced directional coupler switches

The Wavelength Sensor Using Optical Directional Coupler

A wavelength sensor by optical directional coupler

Electro-optic directional coupler switch characterization

Symmetric directional coupler switches

Broad-band high-silica optical waveguide star coupler with asymmetric directional couplers

High-extinction directional coupler switches by compensation and elimination methods