We demonstrate all-optical NOR logic operation of four data signals in one SOA. Exploiting XGM, wavelength
multiplexing and optical filtering for signal discrimination, we purpose an implementation in which an all-one optical
probe signal is modulated by the optical sum of four different data signals at 10 Gbps each. Data signals act as pump and
reduce the gain of the SOA producing on-off keying of the probe and, hence, the NOR behavior. We derive the
feasibility of a multiple-bit NOR from a simple XGM setup working at a wide range of pump power by means of a
characterization with all-one RZ streams. High-resolution measures of the signals are presented to illustrate nonlinear
effects and wavelength management. Signals traces are showed to prove logic functioning and 4-bit gate quality is
reported by means of eye diagrams of the output signal for different input powers.
Silicon-based light emitting device is the missing piece in the design of complete optoelectronic circuits on silicon. A
complete electrical and optical characterization of electroluminescent silicon-nanocrystals based devices is presented.
This characterization is the first step in the design of coupling structures with optimal injection of light into optical
waveguides, which will allow the development of all-silicon photonic circuits.
In this paper, a novel coupling structure based on rectangular surface grating has been studied with promising results,
increasing the coupling efficiency to SU-8 waveguides up to 25 times. The SU-8 photoresist is fully compatible with
silicon technology and can be used to define waveguides as well as microfluidics channels. These properties are
interesting for the final application of the present study, which is to obtain a Lab-on-a-chip device, integrating all the
optical elements, control electronics and microfluidics channels.
A ray tracing simulation method for integrated optics hollow waveguides has been developed. This method has been
tested on Silicon waveguides with good results, providing a suitable design tool for new devices using this type of
waveguides.
The simulations allow the design of new guiding structures based on hollow waveguides, like input tapers to reduce the
insertion losses. The study of the hollow waveguide behavior with different refractive indices opens the way for their use
as refractive index sensors.
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