Silica-on-silicon waveguides have been fabricated doping core layer with phosphorus and germanium. Plasma Enhanced Chemical Vapor Deposition has been used to grow all layers starting from liquid metalorganic compounds. Co-doping assures chemical (Ge) and geometrical (P) homogeneity with optical fibers and allows to propagation losses of 1 dB/cm (not reflowed samples). Low cost, high realization rate and process compatibility with other microelectronic components make this technology very attractive for industrial production.
A new integrated optical device is demonstrated for the polarisation independent spectrum analysis of in fiber optical radiation. The device exploits the heterodyne detection of the optical signals from the output of an acousto-optical tunable filter fabricated on XY LiNbO3. The device is used to analyse and multiplex the optical signals from Fiber Bragg Grating sensors.
This paper discusses the use of fiber gratings as sensing devices and the measurement limitations imposed by conventional laboratory instrumentation. Work that is currently in progress on instrumentation development to alleviate some of these limitations to yield practical, robust systems is discussed. Research activities concerning 2 system configurations are addressed in some detail: (1) sensor arrays in a system based on broadband optical transmitters with narrowband optical receivers using conventional optical filters or acoustically-tuned, integrated optic filters, and (2) sensor arrays in a system based on narrowband, optical transmitters with laser diodes or fiber lasers that make use of fiber gratings as wavelength tuning elements in conjunction with simple, broadband optical receivers.
A new architecture is proposed for the optical beam forming in Phased Array Active Antennas (PAAA) in which the integrated optical technologies allow to realize a simple and effective coherent optical processor. The system proposed here combines the advantages of the microoptics systems (all optical processing) with the ruggedness and small size of the integrated optical circuits. These results are obtained by the use of optical multifunctional circuits integrated on LiNbO3 performing all the necessary processing. The resulting network consists of a single integrated optical chip for each antenna row and the optical fibers for the distribution of the signals (frequency, phase) to the active radiating elements. The system architecture will be discussed and technological results in the fabrication of the integrated optical circuit will be presented.
The PE technology has been applied in the fabrication of a wide bandwidth interferometric modulator in X-cut Lithium Niobate. The utilization of dilute melt of Benzoic Acid and Lithium Benzoate as source in the H-Li exchange process, and the introduction of a subsequent appropriate thermal annealing allow to obtain high quality channel waveguide characterized by high long term stability, high electrooptical efficiency , low propagation losses, low fiber-waveguide insertion losses and high resistance to the laser radiation induced damage. The main advantages of this modulator in comparison with the similar Ti-induffusion based device are the lower fabrication cost and the possibility to handle higher optical power, allowing higher dynamic range of the signal processing system.
Conference Committee Involvement (17)
Emerging Technologies IV
11 September 2019 | Strasbourg, France
Emerging Technologies
12 September 2018 | Berlin, Germany
Emerging Imaging and Sensing Technologies
13 September 2017 | Warsaw, Poland
Emerging Imaging and Sensing Technologies
28 September 2016 | Edinburgh, United Kingdom
Optics and Photonics for Counterterrorism, Crime Fighting, and Defence
26 September 2016 | Edinburgh, United Kingdom
Optics and Photonics for Counterterrorism, Crime Fighting, and Defence
21 September 2015 | Toulouse, France
Emerging Technologies
23 September 2014 | Amsterdam, Netherlands
Optics and Photonics for Counterterrorism, Crime Fighting and Defence
22 September 2014 | Amsterdam, Netherlands
Emerging Technologies
25 September 2013 | Dresden, Germany
Optics and Photonics for Counterterrorism, Crime Fighting and Defence IX
23 September 2013 | Dresden, Germany
Optics and Photonics for Counterterrorism, Crime Fighting and Defence
24 September 2012 | Edinburgh, United Kingdom
Emerging Technologies
24 September 2012 | Edinburgh, United Kingdom
Optics and Photonics for Counterterrorism and Crime Fighting
19 September 2011 | Prague, Czech Republic
Optics and Photonics for Counterterrorism and Crime Fighting
20 September 2010 | Toulouse, France
Photonic Components and Architectures in Defence Systems
3 September 2009 | Berlin, Germany
Photonic Components and Architectures for Microwave Systems and Displays II
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