Design and performance analysis of InP/InGaAsP-MMI based 1310/1550-nm wavelength division demultiplexer with tapered waveguide geometry

Abstract

The design and performance analysis of a 1310/1550-nm wavelength division demultiplexer with tapered geometry based on InP/InGaAsP multimode interference (MMI) coupler has been carried out. Wavelength response of demultiplexer of conventional MMI and tapered input and tapered output (tapered I/O) waveguides geometry of the MMI have been discussed. The demultiplexing function has been first performed by choosing a suitable refractive index of the guiding region and geometrical parameters such as the width and length of MMI structure have been achieved. Access width of tapered I/O waveguides have been adjusted to give a low insertion loss (IL) and high extinction ratio (ER) for the considered wavelengths of 1310 nm and 1550 nm. The total size of the demultiplexer has been significantly reduced over the existing MMI devices. Numerical simulations with finite difference beam propagation method are applied to design and optimize the operation of the proposed demultiplexer.

The Method of Low-Temperature ICP Etching of InP/InGaAsP Heterostructures in Cl2-Based Plasma for Integrated Optics Applications

“…Table 6 shows the measurement results of insertion loss for the two most successful designs. The insertion loss of the splitters did not exceed 0.8 dB, which can be considered a good level [28][29][30][31][32][33].…”

D‐A‐D‐based Unsymmetrical Thiosquaraine Dye for the Dye‐Sensitized Solar Cells†

“…Synthesis of unsymmetrical SQ5S dye (4): Dissolved SQ5 dye (0.2 g, 0.262 mmol) and Lawesson's reagent (0.16 g, 0.393) in 6 mL of anhydrous toluene in a 30 mL microwave reactor tube and heated at 150°C for 20 min in a microwave reactor (400 W). Column chromatography has been used for purification (SiO 2 , 100–200 mesh, 3% CH 3 OH and 97% CH 2 Cl 2 ) to give the required dye as green colored solid.…”

“…Though first and second‐generation photovoltaic technologies offer higher photocurrent generation due to high incident photon to current conversion efficiency with broad spectral regions, third‐generation photovoltaic technology opens an avenue for making cost‐effective and flexible solar cell devices (1). Furthermore, modulation of various device components such as anode, cathode, electrolyte and light‐absorbing sensitizers make the dye‐sensitized solar cell (DSSC) (2–7) very attractive, besides other third‐generation photovoltaic technologies. Organic sensitizers offer different architectures to enhance the light‐harvesting properties of the dyes, such as D‐A (8–10), D‐π‐A (11–13), D‐A‐π‐A (14,15), D‐D‐π‐A (16,17), and D‐A‐D (18–23) types.…”

Far‐red active unsymmetrical squaraine dyes containing N‐arylated indoline donors for dye sensitized solar cells

“…Dye-sensitized solar cells (DSSCs) attracted worthy attention in the last two decades and considered as a potential photovoltaic device for harnessing renewable energy, due to their flexibility in modulating the various components of the device, low cost device fabrication, high power conversion photovoltaic efficiency. 1 Dye sensitization with mesoporous TiO 2 film 2,3 has attracted researcher to develop various components of the DSSC device such as photoanode, 4 sensitizer, 5,6 electrolyte, 7 and cathode materials 8 for the high DSSC device performance. Light harvesting dye and a good dye-TiO 2 /electrolyte interface dictates the DSSC device performance, and for an enhanced device performance steps such as (i) charge injection, 9 (ii) dye regeneration 10 processes have to be accelerated and charge recombination 11,12 step need to be slowed down upon photo-excitation of sensitizers.…”