Title :
High-isolation polarization-independent quasi-optical circulator
Author_Institution :
NTT Transmission Syst. Lab., Kanagawa, Japan
fDate :
9/1/1992 12:00:00 AM
Abstract :
A polarization-independent quasi-optical circulator having high isolation over a wide wavelength range is reported. The proposed quasi-circulator is composed of two polarization beam splitters, two pentagonal prisms, two nonreciprocal rotators, and two walkoff polarizing beam splitters. Its structure is very simple. A three-port quasi-circulator has been fabricated with single-mode fibers. Its insertion loss and isolation have been measured to be ⩽1.7 and ⩾48.6 dB, respectively, at the nominal wavelength of 1.3 μm. A loss ratio of over 47.0 dB has been realized. The wavelength range over a 50-dB isolation between two fibers was measured to be about 50 nm
Keywords :
light polarisation; optical communication equipment; optical fibres; optical isolators; optical losses; optical prisms; optical waveguide components; 1.3 micron; 1.7 dB; high isolation; insertion loss; nonreciprocal rotators; pentagonal prisms; polarization beam splitters; polarization-independent quasi-optical circulator; walkoff polarizing beam splitters; Birefringence; Coupling circuits; Insertion loss; Optical fiber communication; Optical fiber devices; Optical fiber polarization; Optical losses; Optical polarization; Optical propagation; Wavelength measurement;
Journal_Title :
Lightwave Technology, Journal of
