Calculated wavelength sensitivity of lithium niobate switches

Author

Watson, James E. ; Milbrodt, Michele A.

Author_Institution

AT&T Bell Lab., Breinigsville, PA, USA

Volume

7

Issue

12

fYear

1989

fDate

12/1/1989 12:00:00 AM

Firstpage

1973

Lastpage

1981

Abstract

A method is presented for calculating the wavelength sensitivity for electrooptic guided-wave stitches that work by mode interference, including directional-coupler and balanced-bridge switches. The method relies on a coupled-mode theory, using measured wavelength sensitivity of the coupling. Crosstalk is taken as the bandwidth-limiting property and is calculated by expanding in bandwidth. It is found that the wavelength sensitivity depends on the coupler gap, the amount of coupling, and the electrode configuration. Numerical examples show that switches with proper design can exhibit better than 25 dB of crosstalk with a 100-μm bandwidth. Modulators have a still wider bandwidth

Keywords

crosstalk; directional couplers; electro-optical devices; lithium compounds; optical couplers; optical switches; optical waveguides; sensitivity; 25 dB; LiNbO₃; balanced-bridge switches; coupled-mode theory; coupler gap; crosstalk; directional-coupler switches; electrode configuration; electrooptic guided-wave stitches; mode interference; wavelength sensitivity; Bandwidth; Crosstalk; Interference; Laser modes; Lithium niobate; Optical device fabrication; Semiconductor laser arrays; Semiconductor lasers; Switches; Wavelength measurement;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.41617

Filename

41617