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Multimode-interference-based broad-band demultiplexers with internal photonic crystals
Optics Express
|June 12, 2009
Summary
A novel broadband demultiplexer combining multimode interference and photonic crystals offers a compact solution for optical communications. This device achieves excellent performance with high isolation and low insertion loss across wide wavelength bands.
Area of Science:
- Photonics and Optical Engineering
- Nanotechnology
Background:
- Demultiplexers are crucial components in optical communication systems for separating different wavelengths.
- Existing demultiplexer designs often face limitations in terms of size, bandwidth, or performance.
Purpose of the Study:
- To design and simulate a compact broadband demultiplexer using a hybrid approach.
- To achieve high performance metrics, including isolation ratio and insertion loss, over a broad bandwidth.
Main Methods:
- Utilizing a combination of multimode interference (MMI) principles and photonic crystal (PhC) structures.
- Employing the finite-difference time-domain (FDTD) method for rigorous electromagnetic simulations.
Main Results:
- Demonstrated a highly compact broadband demultiplexer structure.
- Achieved an isolation ratio greater than 20 dB.
- Obtained an insertion loss of less than 3 dB across 100nm bandwidths at both 1.3 µm and 1.55 µm wavelength bands.
Conclusions:
- The proposed MMI-PhC hybrid structure is a promising solution for efficient broadband wavelength demultiplexing.
- The compact design and excellent performance metrics make it suitable for integrated optical circuits and advanced communication systems.
