High-isolation polarization-independent optical circulator

Author

Fujii, Yohji

Author_Institution

NTT Transmission Syst. Lab., Kanagawa, Japan

Volume

9

Issue

10

fYear

1991

fDate

10/1/1991 12:00:00 AM

Firstpage

1238

Lastpage

1243

Abstract

A high-isolation polarization-independent optical circulator is reported. The circulator structure can sharply reduce isolation dependency on both the rotation error of a rotator and on extinction ratio of a polarizing beam splitter. As a result, the circulator has high isolation over a wide wavelength and temperature range. A 4-port circulator coupled with single-mode fibers was fabricated. Its measured insertion loss and isolation were <1.8 and >31.5 dB, respectively. Consequently, a loss ratio of over 29.7 dB has been realized. The isolation (which is free from reflections) was measured to be >45.1 dB. It is confirmed that the wavelength range for this kind of isolation over 40-dB is very wide. The measured range was wider than the measurement system limit of 90 nm

Keywords

fibre optics; optical communication equipment; optical couplers; optical losses; 1.8 dB; 4-port circulator; extinction ratio; fibre coupling; high-isolation polarization-independent optical circulator; insertion loss; isolation dependency; loss ratio; measurement system limit; polarizing beam splitter; rotation error; single-mode fibers; temperature range; wavelength range; Degradation; Extinction ratio; Optical attenuators; Optical coupling; Optical fiber polarization; Optical fibers; Optical polarization; Optical reflection; Temperature distribution; Wavelength measurement;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.90921

Filename

90921