A new approach of planar multi-channel wavelength division multiplexing system using asymmetric super-cell photonic crystal structures

Abstract

This work demonstrated a new approach of planar multi-channel wavelength division multiplexing (WDM) system using photonic crystal structures. The system consists of a waveguide that is realized by a defect row of photonic crystal and high Q-value micro-cavities with asymmetric super-cell design. Two-Dimension (2-D) Finite-Difference-Time-Domain (FDTD) method is performed for simulation in this paper. The results showed good ability to filter an incident pulse into six spectral channels with a FHWM improved from 3.6 nm to 1.4 nm and the coherence length improved from 0.667 cm to 1.716 cm at the center wavelength 1550 nm channel and no transmission degradation. Six-channel coarse wavelength division multiplexing (CWDM) from 1490~1590 nm with channel spacing of 20 nm which defined by ITU-T Recommendation G.694.2 are presented. And the inter-channel cross-talk is smaller than -17 dB. The device design is leading the way to achieve CWDM specification and has good capability to extend the application of communication filed and fiber optical sensor field.

Design and Modeling of WDM Integrated Devices Based on Photonic Crystals

“…In this design, the reflected back power to input port, except at the resonant frequencies, is close to 100% which leads to noise if the designed structure is incorporated in photonic integrated circuits . A similar design has also been proposed by Kuo et al based on using high Q-value micro-cavities with asymmetric super-cell design (Kuo et al, 2006). This design leads to an improvement in the drop efficiency and the full-width at half-maximum (FWHM), respect to the corresponding symmetric super-cell.…”

“…The simulated transmission spectrum through the drop waveguide (the dashed curve) represents that the proposed CDF has the ability of dropping a wavelength channel (at frequency The channel spacing can be reduced to 1nm for the 15dB  inter channel crosstalk. In a single cavity based CDF with reflector, the crosstalk with channel spacing of 20nm is between 18  to 23 dB  (Kuo et al, 2006). waveguides.…”

Compact wavelength demultiplexer via photonic crystal multimode resonators

“…A number of wavelength division multiplexing (WDM) systems based on PhCs have been proposed and realized in experiments. These PhC WDM systems are developed based on resonators [4][5][6][7][8][9][10][11][12][13][14][15], waveguide couplers [16][17][18], or superprism effects [19][20][21]. Those based on PhC resonators are particularly attractive due to their small sizes.…”

New Design of All-Optical Slow Light TDM Structure Based on Photonic Crystals

“…In the field of optical communication and optical fiber sensor applications, a number of different sensors multiplexing have been reported and widely used [8][9][10][11], such as Time-Division-Multiplexing (TDM), Wavelength-Division-Multiplexing (WDM), Frequency-Division-Multiplexing (FDM) and Coherence-Division-Multiplexing (CDM). TDM system has been shown to have many advantages, such as low crosstalk and high sensitivity [12,13], and the system also provides a easier and more useful mean of multiplexing technology.…”