SiC monolithically integrated wavelength selector with 4 channels
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SiC monolithically integrated wavelength selector with 4 channels M. Vieira1,2,3, M. A. Vieira1,2, V. Silva 1,2, P. Louro1,2, J. Costa 1,2 1
Electronics Telecommunication and Computer Dept. ISEL, R. Conselheiro EmÃdio Navarro, 1959-007 Lisboa, Portugal CTS-UNINOVA, Quinta da Torre, Monte da Caparica, 2829-516, Caparica, Portugal. 3 DEE-FCT-UNL, Quinta da Torre, Monte da Caparica, 2829-516, Caparica, Portugal 2
ABSTRACT In this paper we present a monolithically integrated wavelength selector based on a double pin/pin a-SiC:H integrated optical active filter that requires optical switches to select visible wavelengths. Red, green, blue and violet pulsed communication channels are transmitted together, each one with a specific bit sequence. The combined optical signal is analyzed by reading out the generated photocurrent, under violet (400 nm) background applied either from the front or the back side of the device. The front and back backgrounds acts as channel selectors that selects one or more channels by splitting portions of the input multi-channel optical signals across the front and the back photodiodes. The transfer characteristics effects due to changes irradiation side are presented. The relationship between the optical inputs and the corresponding digital output levels is established through a 16-element look-up table to perform the optoelectronic conversion. Results show that the wavelength selector acts as a reconfigurable active filter that enhances the spectral sensitivity in a specific wavelength range and quenched it in the others, tuning a specific band. A binary weighted RGBV code that takes into account the specific weights assigned to each bit position is presented and establishes the optoelectronic functions. INTRODUCTION Reconfigurable multi-rate next generation optical networks are currently investigated to handle the ever increasing growth of the Internet traffic. A demultiplexer sends data from a single source to one of several destinations. Whereas the multiplexer is a data selector, the demultiplexer is a data distributor. Reconfigurable wavelength selectors that allow for operation on a large number of wavelength channels, with dynamic response, are essential sub-systems for implementing reconfigurable WDM networks and optical signal processing [1, 2]. This constitutes a solution in WDM technique for information transmission and decoding in the visible range [3]. Amplification and magnitude variation are two key functionality properties outcome of a balanced interaction between the wavelength of the optical signals and background side and wavelength. Any change in any of these factors will result in filter readjustments. Here, signal variations with and without front and back backgrounds move electric field action up and down in a known time frame selecting the appropriated wavelength. DEVICE CONFIGURATION AND OPERATION The wavelength selector filter is realized by using double pin/pin a-SiC:H photodetector with front and back biased optical gating elements as depicted in Fig. 1. The filte
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