Abstract

An entirely new type of single-mode all-fiber polarizer is reported. The polarizer is based on a narrow circularly fused null taper coupler, which was twisted through 45° after being made. The polarizing effect is due to the excitation of hybrid second modes in the coupler waist. An extinction ratio of 15 dB and an insertion loss of 0.2 dB have been obtained, with scope for further improvement.

© 1995 Optical Society of America

Four-port fiber frequency shifter with a null taper coupler

T. A. Birks, S. G. Farwell, P. St. J. Russell, and C. N. Pannell
Opt. Lett. 19(23) 1964-1966 (1994)

All-fiber LP₁₁ mode convertors

A. Witkowska, S. G. Leon-Saval, A. Pham, and T. A. Birks
Opt. Lett. 33(4) 306-308 (2008)

Polarization-independent all-fiber isolator based on asymmetric fiber tapers

Xiaojun Fang
Opt. Lett. 21(21) 1792-1794 (1996)

Polarization-independent all-fiber wavelength-division multiplexer based on a Sagnac interferometer

Xiaojun Fang and Richard O. Claus
Opt. Lett. 20(20) 2146-2148 (1995)

Fiber-optic polarizing directional coupler

M. Kawachi and M. Kobayashi
Opt. Lett. 9(5) 183-185 (1984)