Abstract-The article analyzes a nine-channel Wavelength Division Demultiplexer based on a twodimensional photonic crystal lattice. In the design of the device, defects and air holes are shifted in the resonant cavities: by changing characteristics such as radii of defects, distance between them and position of defects. A compact optical filter circuit is designed with a 1 nm channel spacing. The properties of these devices are investigated using finite-difference time-domain method. The resonant wavelengths of nine channel demultiplexers are 1481. 4, 1503.7, 1526.6, 1538.4, 1550.3, 1562.3, 1574.7, 1587.2 and 1612.9 nm. The value of transmission efficiency for channels was obtained in 79-96% range. In addition, the maximum value of crosstalk and average quality factor for channels were calculated −11.3 dB and 2000, respectively. The overall size of the structure is small (11.3 µm × 15.3 µm) which is suitable for photonic integrated circuits and optical communication network applications.
figure 1 [1]. The photocurrent derived from both photodiodes is controled by the interfet transistor and amplified with a one stage low noise amplifier.
Figure1: A balanced mode differential detectorWe can envisage to work with a home made electro-optical modulator (EOM) constituted by a conductor wire rolled around a cylindrical ceramic which plays the role of a capacitor fixed between two metallic pieces. We choose a resonance frequency (~ MHz) by adjusting the mechanical pressure (for example with many screws) applied on the upper mechanical piece. The microwave energy is introduced inside the box via a SMA connector [2]. See figure 2. Otherwise, a very good quality resonant EOM can be available in the market. The wide band EOM are in fact less performant.
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