Waveguide polarizer based on resonant tunneling

Abstract

We propose a novel and highly efficient waveguide polarizer based on the phenomenon of resonant tunneling. Based on this principle it is possible to fabricate both TE and TM pass polarizers. We show that by proper choice of materials it is possible to obtain TM mode loss greater than 80 dB/mm with a TE mode loss of only 0.5 dB/mm for the TE pass polarizer and TE mode loss up to 24 dB/mm with a TM mode loss less than 0.8 dB/mm for the TM pass polarizer.

Fiber-Optic Polarizer Using Resonant Tunneling through a Multilayer Overlay

“…is suitable only to obtain moderate polarization extinction ratio PER . Thyagaraw x jan et al 7 have proposed an integrated optic polarizer based on the resonant tunnelling effect which can also be designed to act either as a TE or a TM pass polarizer and have shown theoretically that with proper choice of materials one can obtain PER , 80 dB with an insertion loss for throughput polarisation as low as w x 0.5 dB. Using the same configuration Asakawa et al 8 have proposed a wavelength filter also.…”

Polarization beam splitter based on photonic crystal fibers

“…Miliou et al reported a glass waveguide PBS based on stress-induced birefringence in an ionexchange waveguide [4]. Thyagarajan et al proposed PBSs based on resonant tunneling in three-core couplers [5]. These PBSs can be easily fabricated and are cost-effective, but long coupling length is required.…”

Resonant tunneling three-waveguide polarization splitter

“…This large difference can be made use of in the construction of polarization selective devices based on resonant tunneling principle [7]. In the proposed configuration, the thin high-index medium (WG2) is so chosen that its TM mode is almost resonant with the TM mode of the outer identical guides.…”

“…The extinction ratios ER1 and ER3 are defined as Exit power of TM polarization in WG1 ER1 = 10log 10 ^ rTO __,__.__.__ ._ ",", In order to show the applicability of the concept of the resonant tunneling polarization splitter, we consider a glass waveguide structure with an intermediate silicon layer having the following values of the various parameters [11], [7]: ni = 1.527, n s = 1.5125, n 2 = 3.5 a = 2.0 /xm, d = 3.5 ^m and A = 1.3 /xm. (11) The individual isolated guides of the above structure support only TEo and TMo modes.…”

“…The resonant tunneling principle was recently exploited in the design of both TE pass and TM pass polarizers [7]. Here we consider a structure with a high index guiding layer sandwiched between two given identical waveguides (see Fig.…”