Abstract

A theoretical model for the bending waveguide polarization rotator has been developed based on the full-vectorial wave equations and the coupled-mode theory. Calculation results from this model are found to agree favorably with measurement data reported in literature. It is found that the polarization conversion efficiency of this device hinges on the degree of asymmetry of the cross-sectional field profile with respect to both the x- and y-axes. Sensitivity analysis, furthermore, revealed that the device characteristics are strongly dependent on the waveguide geometry, in particular, the sidewall tilt angle and the amount of over-etch of the ridge waveguide. Finally, it is also found that the bending waveguide polarization rotator is virtually wavelength independent, making it suitable for wavelength division multiplexing (WDM) applications.

[IEEE ]

Numerical analysis of bent waveguides: bending loss, transmission loss, mode coupling, and polarization coupling

B. M. A. Rahman, D. M. H. Leung, S. S. A. Obayya, and K. T. V. Grattan
Appl. Opt. 47(16) 2961-2970 (2008)

Mode-coupling polarization rotator based on plasmonic waveguide

Lin Jin, Qin Chen, and Long Wen
Opt. Lett. 39(9) 2798-2801 (2014)

Improved design of a polarization converter based on semiconductor optical waveguide bends

Salah S. A. Obayya, B. M. Azizur Rahman, Kennith T. V. Grattan, and Hamdi A. El-Mikati
Appl. Opt. 40(30) 5395-5401 (2001)

Ultra-compact and fabrication-tolerant polarization rotator based on a bend asymmetric-slab waveguide

Tongtong Cao, Shaowu Chen, Yonghao Fei, Libin Zhang, and Qing-Yang Xu
Appl. Opt. 52(5) 990-996 (2013)

Coupled-mode theory for optical waveguides: an overview

Wei-Ping Huang
J. Opt. Soc. Am. A 11(3) 963-983 (1994)