Low-loss waveguide optical isolator with tapered mode converter and magneto-optical phase shifter for TE mode input.
Opt Express
; 26(16): 21271-21278, 2018 Aug 06.
Article
em En
| MEDLINE
| ID: mdl-30119431
ABSTRACT
We propose and demonstrate a novel low-loss waveguide optical isolator with tapered mode converter and magneto-optical phase shifter. The principle of operation of the isolator is based on the superposition of the TE and TM modes. The two different modes become direction-dependent due to a magneto-optical phase shift affecting the TM mode. We designed a tapered mode converter in order to generate the TE and TM modes with equal amplitude when the waveguide is excited with a TE mode input. We successfully demonstrated that the fabricated device acts as an isolator showing a different transmittance between forward and backward directions. The maximum isolation measured is 16 dB at a wavelength of 1561 nm for a TE mode input.
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2018
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Article