TE/TM mode splitter with waveguide photodetectors

Tami Kihara; Kiyoshi Yokomori; Shunsuke Fujita; Magane Aoki; Akihiko Hiroe

doi:10.1117/12.138893

13 January 1993 TE/TM mode splitter with waveguide photodetectors

Tami Kihara, Kiyoshi Yokomori, Shunsuke Fujita, Magane Aoki, Akihiko Hiroe

Proceedings Volume 1751, Miniature and Micro-Optics: Fabrication and System Applications II; (1993) https://doi.org/10.1117/12.138893
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

We propose a novel TE/TM mode splitter for an integrated optical detection device for magneto-optical disk pickup. The new mode splitter is monolithically integrated on a Si substrate with pin-photodiodes. This device is composed of optical waveguides A and B with effective indices of refraction N^A and N^B, where N^A > N^B. These two waveguides are connected by a tapered transition region. The light wave guided in waveguide A is incident on the tapered transition region at an angle of incidence greater than the critical angle for the TE₀ mode and smaller than the critical angle for the TM₀ mode. The TE₀ mode is totally reflected and the TM₀ mode is totally transmitted at that region so that this device works as a TE/TM mode splitter. We fabricated the mode splitter's tapered transition region using a novel wet etching process, then examined the TE/TM mode splitting operation using a GaAlAs laser diode ((lambda) equals 0.788 micrometers ). When both TE₀ and TM₀ modes were exited in waveguide A, the extinction ratios of the TE₀ and TM₀ modes were measured with the integrated photodiodes. The extinction ratios were -25.4 dB for the TE₀ mode and -23.3 dB for the TM₀ mode. These values are sufficient for practical application. Furthermore, the polarization detection function was experimentally confirmed using a Faraday rotator.

Citation Download Citation

Tami Kihara, Kiyoshi Yokomori, Shunsuke Fujita, Magane Aoki, and Akihiko Hiroe "TE/TM mode splitter with waveguide photodetectors", Proc. SPIE 1751, Miniature and Micro-Optics: Fabrication and System Applications II, (13 January 1993); https://doi.org/10.1117/12.138893

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