Jian-Jang Lee

High-quality-factor filter based on a photonic crystal ring resonator for wavelength division multiplexing applications

We investigate the properties of ring resonators that are supported by a two-dimensional photonic crystal waveguide. The proposed structure composed of a photonic crystal ring resonator (PCRR) with four scatters can really function as a wavelength division multiplexer. The significance of the design is that the output waveguide is perpendicular to the ring resonator. We numerically demonstrate that the proposed four-channel PCRR device with 3 x 3 inner dielectric rods can provide a transmission efficiency larger than 92%, a quality factor higher than 3800, and crosstalk of less than -32 dB.

New design of four-channel add-drop filters based on double-resonant cavity photonic crystals

We proposed a new double-resonant cavity four-channel add-drop filter based on the in-plane type two-dimensional (2D) photonic crystal with square lattice. Through this novel double-resonant cavity, WDM signals can be coupled in or out of the bus waveguide with 100% add-drop efficiency while completely prohibiting cross talk between the bus and the add-drop waveguides for all other wavelengths. This device could be used as an optical add-drop multiplexer (OADM) in coarse wavelength division multiplexing (CWDM) applications.

Proposal for a New Dense Wavelength Division Multiplexing Filter Based on Two-Dimensional Photonic Crystal Ring Resonator

Abstract A new optical filter design based on a two-dimensional photonic crystal ring resonator structure with an N-channel model is proposed in this article. This study also shows that modifying the scatter radius and the waveguide width can significantly improve the performance of the original structure, which can solve the mode mismatch problem for output waveguide. Here, an example of a 16-channel photonic crystal ring resonator is provided; wavelength spacing of 1.6 nm and a high quality factor Q of 6,000 were achieved. The optical filter would be a potential key component in the application of dense wavelength division multiplexer devices.

Ultra compact and low crosstalk triplexer based on photonic crystal waveguide

We propose an ultra compact and low crosstalk triplexer based on the X-type photonic crystal structure. It has been shown that the striplexer with the size as small as 36μm² can be designed at λ=1.55μm, λ=1.49μm, and λ=1.31μm.

Design of polarization-maintaining photonic crystal fiber with high birefringence

We design a polarization-maintaining photonic crystal fiber (PCF) with elliptical air-holes. The asymmetric geometric structure is proposed for the polarization-maintaining PCF with higher birefringence.

The simulation of beaming and coupling characteristics of photonics crystal structure

In this study, we investigate the potential of a light-focusing device (LFD) for high coupling of self-collimated beams from two-dimensional photonic crystals (2D-PCs) into a conventional slab waveguide.

Design of Triplexing Coupler Based on 2D Photonic Crystals with FTTH Function

We propose a new add-drop filters based on two dimensional photonic crystals (PCs). The structure consists of two PC waveguides and a resonant cavity system. We devise a triplexing coupler by 2D-FDTD method calculation, and the three wavelengths dropping efficiency are higher than 85% and the crosstalk are smaller than -28.6 dB.