An ultra-compact multimode wavelength demultiplexer (MWD) with a footprint of 3.6 × 2.4 μm2 was designed. Its size is approximately two orders of magnitude smaller than the size of the traditional waveguide-based device. Moreover, the designed demultiplexer is multifunctional, and can realize wavelength demultiplexing and mode conversion at the same time. This MWD splits light at the wavelengths of 1450 nm and 1550 nm and simultaneously converts the input light from the fundamental transverse electric (TE0) mode to the first-order transverse electric (TE1) mode. The direct binary search (DBS) algorithm was employed to simulate the design. The results show that the insertion loss of the demultiplexer is −1.26 dB and −0.82 dB for the upper channel (wavelength 1450 nm) and lower channel (wavelength 1550 nm), while the crosstalk values are maintained as low as −18.10 dB and −23.35 dB, respectively. Additionally, a similar structure can be expanded to several modes. Based on these advantages, this multifunctional photonics device is expected to be used extensively in advanced photonic integration circuits.

An ultra-compact dual-channel multimode wavelength demultiplexer based on inverse design

A simplified semi-objective scheme is proposed to optimally design a coarse wavelength demultiplexer (CDeMUX), based on the structure of multimode interference (MMI). The objective function of the CDeMUX is given as the difference between the desirable and actual output power. The conversion degree restriction (CDR) is defined as the upper limit of average permittivity difference in the multimode interference (MMI) region, which is divided into q × p conversion cells. The value of p or q increases alternately until the CDR is reached. The optimal design of CDeMUX with the insertion loss of 0.58 dB and 0.55 dB, extinction ratio of 26.3 dB and 27.6 dB is achieved for the quasi-TE mode at 1310 nm and 1550 nm, respectively. The scheme reduces the complexity of device structure and fabrication process.

Design of a coarse wavelength demultiplexer based on simplified semi-objective scheme

A compact and easy-fabricated polarization splitter-rotator (PSR) using SIO2 top-cladding directional coupler with a slotted waveguide is proposed and characterized The proposed device can be easily fabricated with CMOS technology as only one regular slot needs to be etched on a silicon nanowire Compact size of 42 μm device length at 155 μm is realized after the optimizing process while the maximum power conversion efficiency is achieved as high as 94% With the length variation of ± 5 μm, the conversion efficiency is still larger than 91%, which shows a large fabrication tolerance The influence of the slot center deviation on conversion efficiency and the bandwidth of the device are also investigated

Design of compact and easy-fabricated polarization splitter-rotator based on slotted waveguide

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Design of a coarse wavelength demultiplexer based on simplified semi-objective scheme

Design of compact and easy-fabricated polarization splitter-rotator based on slotted waveguide