Systematic Design of Wide-Bandwidth Photonic Crystal Waveguide Bends With High Transmission and Low Dispersion

Abstract

We identify factors affecting transmission and dispersive properties of photonic crystal waveguide (PCW) bends, using 2-D simulations and present a method for systematic design of PCW bends to achieve high transmission and low dispersion over large bandwidths. The bends presented here have higher bandwidth and lower dispersion than bends already reported.

Systematically Designed PCW Bends With Very Large Bandwidth and High Transmission: An Experimental Demonstration

“…We also theoretically compared the performance of our systematically designed bends with some of the bends reported earlier in literature [8]- [10]. In this letter, we present the experimental characterization of PCW bends designed using our methodology, and show excellent agreement with the theoretical results [6]. The PC used in this letter is a triangular lattice of air holes in Si.…”

“…In an earlier paper [6], we presented in detail a systematic method for designing high transmission and low dispersion PCW bends. We also theoretically compared the performance of our systematically designed bends with some of the bends reported earlier in literature [8]- [10].…”

“…In order to design the bends in a systematic manner [6], we first study the effect of individual air holes in the vicinity of the guiding region (see air holes r 1 , r 2 , r o and r e in Fig. 2) on the dispersion and field profile of the X section (or the coupling region).…”

Multi-directional ultra-high sensitive pressure sensor based on the integration of optimized double 60° bend waveguides and modified center-defect photonic crystal microcavity

“…Air holes in the W1 waveguide are removed until the hole along the direction (60 • aslant direction) of PhC microcavity to achieve the best coupling strength. The transmission can be very high because the light-wave experiences the least difference between propagating along the straight waveguide and through the bend waveguide [36][37][38][39][40]. As a result, in order to minimize the loss caused by the mode patterns mismatch between the guided modes in the straight waveguide (Γ -K direction) and the waveguide bend (Γ -M direction), we move the air holes (blue holes at the corner of the bend) oppositely along the symmetric axis of the bend and change these holes radius to optimize the bend performance.…”

Low loss sharp photonic crystal waveguide bends

“…Through photonic band gap (PBG) and slow light effect [2], various optical devices based on photonic crystals have been demonstrated with ultra-small footprints, such as waveguides [3], resonators [4], filters [5] and bends [6]. Among them, high efficient photonic crystal waveguide (PCW) bend can be achieved with the spatial extent on the order of the wavelength, which is a promising candidate for compact PICs [7][8][9].…”