Dual-input concave diffraction grating demultiplexer based on dielectric multidirectional reflectors.

Area of Science:

• Photonics
• Optical Engineering
• Materials Science

Background:

• Conventional concave diffraction gratings (CDGs) are limited in dense wavelength multiplexing due to chip size and cost constraints.
• Achieving high dispersion typically requires larger, more expensive devices.

Purpose of the Study:

• To propose and demonstrate a compact dense wavelength multiplexing device.
• To overcome the limitations of conventional CDGs for increased channel density.

Main Methods:

• Integration of a dual-input CDG with dielectric multidirectional reflectors.
• Design of dielectric multidirectional reflectors using one-dimensional photonic crystal theory.
• Simulations to evaluate device performance.

Main Results:

• The dual-input CDG structure doubles the channel number and halves channel spacing.
• High reflectivity over a wide angular range is achieved by the grating teeth.
• Simulations show efficiency > -0.564 dB and crosstalk < -21.2 dB for specific incident angles.

Conclusions:

• The proposed dual-input CDG with dielectric multidirectional reflectors offers a compact and efficient solution for dense wavelength multiplexing.
• This approach enables higher channel density at a constant chip size.
• The use of photonic crystal theory for reflector design enhances performance.