Abstract
We propose a novel 8-channel wavelength multimode interference (MMI) demultiplexer in slot waveguide structures that operate at 1530 nm, 1535 nm, 1540 nm, 1545 nm, 1550 nm, 1555 nm, 1560 nm, and 1565 nm. Gallium nitride (GaN) surrounded by silicon (Si) was found to be a suitable material for the slot-waveguide structures. The proposed device was designed by seven 1 × 2 MMI couplers, fourteen S-bands, and one input taper. Numerical investigations were carried out on the geometrical parameters using a full vectorial-beam propagation method (FV-BPM). Simulation results show that the proposed device can transmit 8-channel that works in the whole C-band (1530–1565 nm) with low crosstalk (−19.97–−13.77 dB) and bandwidth (1.8–3.6 nm). Thus, the device can be very useful in optical networking systems that work on dense wavelength division multiplexing (DWDM) technology.
Highlights
Dense wavelength division multiplexing (DWDM) is an optical multiplexing technology used to increase the bandwidth over existing fiber networks [1]
We present a 1 × 8 wavelength multimode interference (MMI) demultiplexer in a slot Si-Gallium nitride (GaN) waveguide structure that divides eight channels in the C-band range with a spacing of 5 nm between channels
The optimal values of the slot-waveguide structure were calculated by full vectorial-beam propagation method (FV-BPM) simulations combined with Matlab software
Summary
Dense wavelength division multiplexing (DWDM) is an optical multiplexing technology used to increase the bandwidth over existing fiber networks [1]. The MMI demultiplexer device-based Si-GaN slot waveguide is not very sensitive to the variation in the optical signals in the C-band [20] that enable an ability to separate wavelengths in the. In order to obtain a compact device, the location of the input taper was shifted ± 16 We from the center of Wmmi This shift can lead to a cancellation of the third mode inside the MMI coupler. Where Pout is the power at the output port, and Pin is the power in the input taper
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