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Silicon-based photonics has generated a strong interest in recent years, mainly for optical telecommunications and optical interconnects in microelectronic circuits. The main rationales of silicon photonics are the reduction of photonic system costs and the increase of the number of functionalities on the same integrated chip by combining photonics and electronics. In this paper, we will present recent...
First demonstrations of high speed silicon optical modulators fabricated on 300 mm silicon-on-insulator (SOI) wafers in CMOS foundry are presented. Both ring resonator and Mach Zehnder structures show 10 Gbit/s modulation. Small signal electro-optical bandwidth up to 20 GHz has been achieved, demonstrating the possibility of 40 Gbps data-rate transmission.
We report the transfer of a GHz modulation from an optical carrier at telecom wavelengths to a free space THz beam. THz radiation-tunable from 300 GHz to 1.2 THz- is generated by mixing two telecom lasers with an offset frequency in an ultrafast In0.53Ga0.47As photoconductive device coupled to a broadband antenna. A maximum modulation rate of 20 GHz has been achieved, and the bandwidth is independent...
In order to support the communication needs of our society, carrier frequencies for wireless communication networks in the terahertz frequency range will be an almost forced choice. For instance, the technology of choice to encode high-frequency data signals onto a terahertz carrier is still an open issue. This article investigates the transfer of a gigahertz modulation from an optical carrier at...
The evolution of silicon optical modulators is recalled, from the first effect demonstrations to the characterization of high-performance devices integrated in optical waveguides. Among possibilities to achieve optical modulation in silicon-based materials, the carrier depletion effect has demonstrated good capacities. Carrier depletion in Si and SiGe/Si structures has been theoretically and experimentally...
We present a fiber-based 2-port THz electro-optic sampling system at 1.55 mum wavelength. Frequency components are extended up to 2 THz and the dynamic range is larger than 40 dB regardless of the direction of the electromagnetic wave propagating in the waveguide. The symmetrical 2-port pigtailed electro-optic probe allows to determine the direction of propagation of the guided picosecond electromagnetic...
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