Abstract
A novel wavelength combiner using non-uniform refractive index distribution within a multimode interference device is proposed and simulated. The refractive index step creates separate localized modes with different effective refractive indices and two modes are strongly excited which form the basis of an interferometer. We applied the concept to 1.30/1.31 μm and 1.31/1.55 μm wavelength combiners on an InP substrate. The lengths of the devices are 1272 μm and 484 μm with simulated insertion losses of 0.6 dB and 0.67 dB respectively.
Highlights
Wavelength combiners are essential components for wavelength division multiplexing (WDM)optical communications systems
We propose a novel multimode interference (MMI) device concept in which non-uniform refractive index forms two distinct modes and its middle section acts as an interferometer
One difference of the proposed MMI-based wavelength combiners over arrayed waveguide devices (AWG) or Mach-Zehnder interferometer (MZI) is that they are narrow and straight devices (W < 10 μm) which can be placed next to each other and will be beneficial when many similar devices need to be integrated on a single chip
Summary
Wavelength combiners are essential components for wavelength division multiplexing (WDM)optical communications systems. Abstract: A novel wavelength combiner using non-uniform refractive index distribution within a multimode interference device is proposed and simulated. “Application of Numerical Optimization to the Design of InP-based Wavelength Combiners,” Optics Communications 322, 131–136 (2014).
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