Design of a novel multiplexer/demultiplexer based on polarization beam splitters/combiners and a polarization converter
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RESEARCH ARTICLE
Design of a novel multiplexer/demultiplexer based on polarization beam splitters/combiners and a polarization converter Fethallah Karim1
Received: 31 August 2019 / Accepted: 16 September 2020 Ó The Optical Society of India 2020
Abstract In this paper, a theoretical design of a novel 2 9 1 polarization-discriminating multiplexer based on a polarization beam combiner (PBC), two polarization beam splitters (PBS) and a TE/TM polarization converter is presented and discussed. The architecture of this design is based on polarization components. The PBS is used at the input to suppress undesired polarizations, while the PBC is inserted at the output to multiplex two orthogonal linearly polarized signals. The TE/TM converter is inserted between the PBS and the PBC to switch between two orthogonal modes in order to facilitate the multiplexing function. The demultiplexing operation is done in a separate block via a PBS only. The average theoretical insertion loss of the proposed multiplexer is 1.2 dB, while the PBS acting as a demultiplexer presented a very high polarization extinction ratio. Keywords Polarization-discriminating multiplexer Beam splitter Beam combiner Polarization converter Polarization extinction ratio
Introduction The dense wavelength division multiplexing (DWDM) access technique plays a major role in actual high data rates optical systems since several multiplexed signals can be used simultaneously to achieve huge data rates up to 19.2 Tbps on coherent optical systems. This technology is used & Fethallah Karim [email protected] 1
Laboratory of Telecommunications, Faculty of Technology, Tlemcen, Algeria
via the multiplexers and demultiplexers (MUX/DEMUX) devices which are considered as key components in the optical networks. Several multiplexing technologies have been used until day. We note the MUX/DEMUX based on dielectric thin filters, using graded index lenses (GRIN) [1]. A combination of optical circulators (OC) and wavelength division multiplexing (WDM) couplers has been presented in [2]. Another combination of a chirped FBG, an apodized FBG and optical circulators (OC) has been reported in [3]. We note also the AWG-based MUX/DEMUX [4], the MUX/DEMUX devices using the diffraction gratings [4], the polarization interference filters-based MUX/DEMUX [4] and the Mach–Zehnder filter-based MUX/DEMUX [4]. A silicon-nanowire-type multiplexer/ demultiplexer based on multistage microring resonator assisted delayed Mach– Zehnder interferometers has been cited in [5]. We note the polarization-independent surface plasmon multiplexer–demultiplexer based on dual-core photonic crystal fiber, which has been presented in [6]. Finally, we note the reconfigurable optical multiplexer based on liquid crystals for polymer optical fiber networks, cited in [7]. Our proposed MUX/DEMUX device looks like, in its working principle, the polarization interference filtersbased optical interleaver cited in [4], since it uses polarization components. However, in our design, we have considered th
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