The authors report the first optical receiver to use a waveguide pin photodiode as a high-power and high-speed photodiode. Its measured receiver sensitivity of 15 Gbit/s confirms that waveguide pin photodiodes have hi...
详细信息
The authors report the first optical receiver to use a waveguide pin photodiode as a high-power and high-speed photodiode. Its measured receiver sensitivity of 15 Gbit/s confirms that waveguide pin photodiodes have high-speed potential and flat frequency response under high input powers beyond +10dBm.
A novel design of an opticalwaveguide cutoff modulator is proposed. The attenuation of the guided mode in the opticalwaveguide is controlled by a voltage applied to the coplanar waveguide electrodes deposited on the...
详细信息
A novel design of an opticalwaveguide cutoff modulator is proposed. The attenuation of the guided mode in the opticalwaveguide is controlled by a voltage applied to the coplanar waveguide electrodes deposited on the top of the opticalwaveguide. An S-shaped opticalwaveguide structure with a corresponding curved coplanar waveguide electrode is used to increase the extinction ratio and decrease the radiation loss from the curved waveguide. The performance of the device is analysed using the finite difference beam propagation method. Simulation results show that, at an operating wavelength of 1.3 mu m, an extinction ratio of over 30 dB can be achieved with applied voltages of +/-10 V.
Based on the plasma dispersion effect of Si1-xGex, 2 x 2 bifurcation optical active switches have been fabricated, in which the Si1-xGex was grown by molecular beam epitaxy. At a 36mA injection current, the device rea...
详细信息
Based on the plasma dispersion effect of Si1-xGex, 2 x 2 bifurcation optical active switches have been fabricated, in which the Si1-xGex was grown by molecular beam epitaxy. At a 36mA injection current, the device reaches maximum optical switching. The crosstalk is less than -11dB and the insertion loss is 3.8dB. The measured response time is <100ns.
The sol-gel process for low temperature fabrication of porous glass has been used to entrap chemically-sensitive dyes for optical sensor applications. Evanescent wave excitation was used to examine the behaviour of an...
详细信息
The sol-gel process for low temperature fabrication of porous glass has been used to entrap chemically-sensitive dyes for optical sensor applications. Evanescent wave excitation was used to examine the behaviour of an unclad fibre which was dipcoated with a thin layer of porous cladding within which a pH-sensitive dye was entrapped. The performance of the pH sensor is reported and the potential of the technique for distributed and integrated optic sensing is discussed.
An optical backplane for high-speed data communication between the electronic boards of a telecommunication switching system has been demonstrated successfully. A light-guiding glass plate is used for the transport of...
详细信息
An optical backplane for high-speed data communication between the electronic boards of a telecommunication switching system has been demonstrated successfully. A light-guiding glass plate is used for the transport of the optical signals at low loss (-0.1 dB/cm). Hybrid grating couplers;are used for achromatic coupling (-1.5 dB). The backplane was integrated into a shelf of a commercial Siemens switching system with board-to-board distances up to 0.7 m and operated at a data rate of 1.4 Gbit/s on each channel.
A design for the fabrication of an IR filter by using a linearly periodic refractive index pattern on the macroscopic scale in a suitable material has been proposed. To predict allowed and forbidden bands of wavelengt...
详细信息
A design for the fabrication of an IR filter by using a linearly periodic refractive index pattern on the macroscopic scale in a suitable material has been proposed. To predict allowed and forbidden bands of wavelengths for the lower modes, a mathematical analysis is presented. Numerical estimates of allowed and forbidden bands are also made. Several parameters controlling the range of operation and region of allowed wavelength bands have been identified. It is being suggested that the technical knowhow used in the manufacturing of optical fibres and integrated optical devices can successfully be employed for the fabrication of these filters.
The authors report the use of a sol-gel film as an overlay guide on an integrated optic buried channel waveguide to selectively couple out near-infra-red wavelengths. The coupling wavelength is shown to be dependent o...
详细信息
The authors report the use of a sol-gel film as an overlay guide on an integrated optic buried channel waveguide to selectively couple out near-infra-red wavelengths. The coupling wavelength is shown to be dependent on the thickness and index of the overlay and on the polarisation of the guided light.
The authors have designed and fabricated an ARROW-based opticalwavelength filter in strip configuration using standard Si technology. The calculated FWHM bandwidth of 4nm and simultaneous filtering of many different ...
详细信息
The authors have designed and fabricated an ARROW-based opticalwavelength filter in strip configuration using standard Si technology. The calculated FWHM bandwidth of 4nm and simultaneous filtering of many different wavelengths with the same device have been verified by measurements.
The gain an Er/P-doped integrated opticalwaveguide amplifier has been calculated as a function of waveguide core design, pump power, and background loss. The optimum core width varies from 2 to 3 mum for pump powers ...
详细信息
The gain an Er/P-doped integrated opticalwaveguide amplifier has been calculated as a function of waveguide core design, pump power, and background loss. The optimum core width varies from 2 to 3 mum for pump powers close to the threshold for amplification up to 3-5 mum for high gain operation.
The feasibility of detecting small molecules such as pesticides using optical evanescent-wave sensors is discussed with emphasis on the Mach-Zehnder sensor and a newly developed sensor called a 'critical' sens...
详细信息
The feasibility of detecting small molecules such as pesticides using optical evanescent-wave sensors is discussed with emphasis on the Mach-Zehnder sensor and a newly developed sensor called a 'critical' sensor. For direct detection of an estimated average pesticide layer growth of 2X10(-4) nm, the sensitivity of the Mach-Zehnder sensor is almost adequate (1X10(-3) nm within one hour), whereas that of the 'critical' sensor (2X10(-2) nm) is not sufficient. However, the simplicity of this latter sensor is very attractive. Results of alpha-hSA/hSA immunoreaction experiments obtained with this last type of sensor are presented.
暂无评论