Polarizers in an Asymmetric Twin Waveguide Based on Resonant Coupling

Author

Wieczorek, A. ; Roycroft, B. ; O´Callaghan, James ; Thomas, Kevin ; Pelucchi, E. ; Peters, F.H. ; Corbett, Brandon

Author_Institution

Tyndall Nat. Inst., Cork, Ireland

Volume

25

Issue

14

fYear

2013

fDate

15-Jul-13

Firstpage

1301

Lastpage

1304

Abstract

A polarization filter based on resonant coupling in an asymmetric twin waveguide (ATG) is demonstrated for the first time. A special taper design of the upper waveguide cladding enables power transfer from the fundamental input to the first higher order mode and causes mode beating. A power extinction ratio (PER) of the TE-relative to the TM-polarization of (3.1 ± 0.4) dB is measured at 1610 nm for two consecutive TM-pass polarizers. A TM/TE-PER of (1.4±0.4) dB is observed for a second device with a similar configuration also at 1610 nm. A single polarizer has a length of only 372 μm. Multiple polarizers can be easily placed in series to increase the PER. In addition, the input waveguide acts as a spot size converter to enable improved coupling to a lensed fiber.

Keywords

optical fibre cladding; optical fibre couplers; optical polarisers; asymmetric twin waveguide; lensed fiber; mode beating; polarization filter; polarizers; power extinction ratio; power transfer; resonant coupling; special taper design; spot size converter; upper waveguide cladding; Spot size converter; asymmetric twin waveguide; polarizer;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2013.2262266

Filename

6514888