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Integrated 25 GHz and 50 GHz spectral line width dense wavelength division demultiplexer on single photonic crystal chip

Balaji V. R., Murugan M., Robinson S., Nakkeeran R.

Opto-Electronics Review

2018

Vol. 26, No. 4

285--295

We propose a new integrated demultiplexer model using the two-dimensional photonic crystal (2D PC) through the hexagonal resonant cavity (HRC) for the International Telecommunication Union (ITU) standard. The integrated model of demultiplexer for both 25 GHz and 50 GHz has been designed for the first time. The demultiplexer consists of bus input waveguide, drop waveguide, Hexagonal Resonant Cavity (HRC), 6 Air Hole Filter (6-AHF), 7 Air Hole Filter (7-AHF). The 7-AHF is used to filter 25GHz wavelength, and the 6-AHF filter is used to filter 50 GHz wavelength. The Q-factor on the designed demultiplexer is flexible based on the idea of increasing the number of air holes between drop waveguide and resonant cavity. The demultiplexer is designed to drop maximum 8 resonant wavelengths. One side of demultiplexer is able to drop 50 GHz ITU standard wavelengths, which are of 1556.3 nm, 1556.7 nm, 1557.1 nm and 1557.5 nm, and further the other facet is able to drop 25 GHz wavelengths, which are of 1551.4 nm, 1551.6 nm, 1551.8 nm, and 1552.0 nm. The proposed demultiplexer may be carried out within the integrated dual system. This system is able to lessen the architecture cost and the size is miniaturized substantially.

Textile preforms for dental applications

Poornim A., Giridev V. R., Balaji V. R.

Autex Research Journal

2007

Vol. 7, no. 2

130--147

Dentistry has advanced to the use of FRCs, which helps patients to live their lifetime with their dentition intact. A large number of developments in the field of fibrous composite implants and devices for orthopaedic and dental applications have taken place. The present paper discusses the applications of fibre- and textile-reinforced composites in dental practices, mainly focussing on periodontal splinting. The conventional methods of splinting and the design & use of fibre-reinforced composites as restoratives to stabilise and splint teeth have been discussed in detail. The current controversy of incorporating implants in patients requiring splinting is discussed in relation to the various fibres applied as reinforcement for the splinting material.