Multi-channel Demultiplexer Research Articles

Electro-mechanical demultiplexer enabled by tunable electric circuits

Inspired by the electronic demultiplexer, acoustic/elastic demultiplexers have received much attention in recent years. An acoustic/elastic demultiplexer can split one input wave signal into several output wave signals based on their frequencies. However, little to no work has been reported on the acoustic/elastic demultiplexers by considering the electro-mechanical coupling. In this letter, a multi-channel demultiplexer is proposed based on one-dimensional piezoelectric metamaterial plates connecting with shunting circuits. In particular, a four-channel electro-mechanical demultiplexer consisting of three electrically connected plates is constructed. As an outstanding example, the electro-mechanical wave with a certain frequency could propagate along a desired path. The underlying design principle relies on the indispensable character of the bandgaps of the piezoelectric plates, which are highly tunable by the external LC circuits. A numerical simulation is carried out by the two-dimensional spectral element method to validate the feasibility of the four-channel demultiplexer. Similarly to crystal filters or crystal oscillators, the proposed electro-mechanical demultiplexer could be integrated into some electronic devices, which may provide a wide range of applications in wireless telecommunication and electric signal processing.

Adjustable Plasmonic Multi-channel Demultiplexer with Graphene Sheets and Ring Resonators

A novel designing method of tunable plasmonic multi-channel demultiplexers is proposed by combining two kinds of graphene ring coupling systems, i.e., middle-coupling structure and side-coupling structure. We discuss the optical transmission characteristic of graphene waveguide and numerically research the characteristics of the two basic structures by modulating the Fermi level applied on graphene rings in theory. By combining the two basic structures, a series of multi-channel structures are designed, and their coupling and modulating regularities are studied by changing the Fermi level applied on graphene rings. The simulation results show the perfect nodulation functions for our designed multi-channel structures and we determine our design bears significant value in future practical applications.

Compact multichannel demultiplexer for WDM‐POF networks based on spatially overlapped FBGs

The fabrication of spatially overlapped fibre Bragg gratings over microstructured polymer optical fibre allows to demonstrate low-cost and compact multichannel wavelength division demultiplexers. Coarse and dense wavelengths in high-capacity optical systems have been demonstrated for reduced size environments with the advantages of polymer fibres.

Dual-side Processed demultiplexer using grating-assisted codirectional coupler

A new type of waveguide-based demultiplexer is made in a GaAs-AlGaAs system with a grating-assisted codirectional coupler structure to pick out the wanted wavelength. Two waveguides that are made vertically coupled are fabricated using a special backside processing method. This proposed multichannel demultiplexer is operated in the near-infrared wavelength range.

All-optical time-division demultiplexing experiment with simultaneous output of all constituent channels from 100 Gbit/s OTDM signal

The successful demonstration of all-optical time-division demultiplexing is reported, wherein all 10 Gbit/s constituent channels are simultaneously demultiplexed with no error from a 10 × 10 Gbit/s OTDM signal. A multichannel demultiplexer based on XPM-induced frequency shift in an optical fibre, called MOXIC, is used.

Multichannel demultiplexer for optical communication lines

A demultiplexer was developed on the basis of a waveguide plane made of fused quartz and intended for use in communication lines composed of fiber waveguides with a core diameter 50 μ. The dimensions of the demultiplexer were 19.8 × 20 × 0.014 mm. Aberrations of a spherical mirror were studied and partly suppressed so that the demultiplexer could be used in separation of 18 spectral channels in the wavelength λ = 0.74–1.7 μ. The total losses in the central channels of the demultiplexer were 3 dB and the cross-talk losses were 20 dB. It was found that the demultiplexer could be operated effectively using radiation sources with a spectral band not wider than 20 nm. The problem of the change in the aperture of the radiation emerging from the demultiplexer was analyzed.