الفهرس 
Wavelength Division Multiplexing Systems OverviewOnly 14 pages are availabe for public view
 |  | from | 224 |  |  |
| | | from | 224 | | |
Abstract
In this thesis, the feasibility of realizing a new structure for Coarse
Wavelength Division Multiplexing CWDM multiplexers using passive
optical components is presented. The study focuses on the realization of
these multiplexers using passive components to benefit from their ease of
fabrication, compact size and low cost.
In the first part of this work, the bandwidth of optical couplers
(MMI and directional couplers) has been studied for estimating their
performance over the CWDM wavelength range (1200 nm to 1600 nm).
The importance of this study comes from the stringent requirements on
the bandwidth imposed by CWDM systems. Also, these couplers are
embedded in nearly all proposed WDM circuits which might be
configured for CWDM. umerical simulations with the Beam
Propagation Method (BPM) were used to investigate the properties of
these couplers.
Second, a new design is proposed for a CWDM multiplexer, based
on the use of an array of coupled ring resonators. This design enjoys
many advantages such as its compact size, possibility of integration and
• potential for extension for up to 16 channels. The proposed design is
investigated for its compliance with CWDM specifications by
calculations based on semi-analytical modeling. umerical simulation
using FDTD were then carried out to verify the main features of theproposed designs. A lx8 CWDM multiplexer with a 20 run channel
spacing, 60 dB crosstalk level, and 0.75 shape factor was obtained