The evolution of angled MMI structure on the SOI platform

Hu, Y., Thomson, D.J., Gardes, F.Y., Mashanovich, G.Z. and Reed, G.T. (2014) The evolution of angled MMI structure on the SOI platform. SPIE Conference on Silicon Photonics IX, San Francisco, United States. 03 - 05 Feb 2014. (doi:10.1117/12.2039577).

Abstract

The angled multimode interferometer (AMMI) was recently demonstrated as a wavelength division (de)multiplexing (WDM) structure employing the phenomenon of dispersive self-imaging in a multimode planar waveguide. It has distinct advantages including very low insertion loss, ease of fabrication and good tolerance to fabrication error. Here, we first demonstrated a further optimized single 4-channel AMMI on the silicon-on-insulator (SOI) platform with a low insertion loss of < 1 dB, a low cross talk of < -23 dB and a non-uniformity of < 0.5 dB. However, a single AMMI is limited to have small channel count with a relatively large channel spacing in order to maintain high-performance WDM functionality. Therefore we subsequently demonstrated two structures derived from a single AMMI on the SOI platform: An 8-channel WDM comprising of two 4-channel AMMIs interleaved by an imbalanced Mach-Zehnder interferometers (MZIs) was fabricated. Low-insertion-loss and low-cross-talk operation was achieved without active tuning structures.

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Contributors

Author: F.Y. Gardes

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