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Li F.,Institute of Photonics and Optical Science IPOS | Jackson S.D.,Institute of Photonics and Optical Science IPOS | Grillet C.,Institute of Photonics and Optical Science IPOS | Magi E.,Institute of Photonics and Optical Science IPOS | And 9 more authors.
Optics Express | Year: 2011

We report record low loss silicon-on-sapphire nanowires for applications to mid infrared optics. We achieve propagation losses as low as 0.8dB/cm at λ = 1550nm, ∼1.1 to 1.4dB/cm at λ = 2080nm and < 2dB/cm at λ = 5.18 μm. © 2011 Optical Society of America.


Carpenter J.,Institute of Photonics and Optical Science IPOS | Xiong C.,Institute of Photonics and Optical Science IPOS | Collins M.J.,Institute of Photonics and Optical Science IPOS | Li J.,University of St. Andrews | And 6 more authors.
Optics Express | Year: 2013

We classically measure the entire propagation matrix of a fewmode fiber and use a spatial light modulator to undo modal mixing and recover single-photons launched onto each of the eigenmodes of the fiber at one end, but arriving as mixed modal superpositions at the other. We exploit the orthogonality of these modal channels to improve the isolation between a quantum and classical channel launched onto different spatial and polarization modes at different wavelengths. The spatial diversity of the channels provides an additional 35dB of isolation in addition to that provided by polarization and wavelength. ©2013 Optical Society of America.


Pasquazi A.,INRS EMT | Peccianti M.,CNR Institute for Complex Systems | Little B.E.,Infinera Ltd. | Chu S.T.,City University of Hong Kong | And 2 more authors.
European Conference on Optical Communication, ECOC | Year: 2012

We summarize our recent results on the generation and of ultrafast optical signals in CMOS-compatible monolithic devices by exploiting the third order nonlinearity of glass based waveguides. We show that we can generate stable train of pulses at 200GHz rep rate with a novel passive mode-locking scheme based on an integrated ring resonator. © 2012 Optical Society of America.


Zhang Y.,Institute of Photonics and Optical Science IPOS | Husko C.,Institute of Photonics and Optical Science IPOS | Schroder J.,Institute of Photonics and Optical Science IPOS | Eggleton B.J.,Institute of Photonics and Optical Science IPOS
Optics Letters | Year: 2014

We provide an analytic solution for pulse propagation and phase-sensitive amplification in silicon waveguides in the regime of strong two-photon absorption (TPA) and significant free-carrier effects. Our analytic results clearly explain why and how the TPA and free carriers affect the signal gain. These observations are confirmed with numerical modelling and experimental results. © 2014 Optical Society of America.


Grillet C.,Institute of Photonics and Optical Science IPOS | Monat C.,Institute of Photonics and Optical Science IPOS | Smith C.L.,Institute of Photonics and Optical Science IPOS | Lee M.W.,Institute of Photonics and Optical Science IPOS | And 3 more authors.
Laser and Photonics Reviews | Year: 2010

We describe progress in the field of tuning, (re)configuration of Photonic crystal (PhC) based devices with a particular emphasis on our recent concepts and techniques that we have developed to tune and/or reconfigure the properties of photonic crystal nanocavities. We show how our hybrid approach based on photosensitive material and tapered silica fiber can tune the (Q. γ) properties of preexisting Photonic crystal cavities. We describe our alternative techniques to create 'a posteriori' spatially (re)configurable high-Q cavities in a PhC platform. We show that optofluidics - the fusion of microfluidics with photonic devices - offer an unquestionable added value to the quest of a truly versatile, (re)configurable photonic crystal based photonic chip. © 2010 by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Hsu S.-H.,Institute of Photonics and Optical Science IPOS | Paoletti C.,Institute of Photonics and Optical Science IPOS | Torres M.,University of Sydney | Ritchie R.J.,University of Sydney | And 2 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2012

The results of a detailed investigation of light transmission behavior of a centric marine diatom species Coscinodiscus wailesii are reported. We measured 3-dimentional intensity distributions of both broadband and monochromatic light transmitted through individual valves of the diatom in air and water. Cross-sectional intensity profiles of transmitted light indicates valves of C. wailesii can concentrate light into certain regions. At a distance from the valve shorter than its diameter, light intensities close to the optical axis are relatively higher than those in the surrounds; at a longer distance, transmitted light intensities display ring-shaped profiles. The distance showing this light concentration characteristic becomes shorter as the wavelength of incoming light goes up. These results may offer insight into the understanding of biological functions of diatom frustules' intricate structures and inspire new optical biomimetic applications. © 2012 SPIE.


Paquot Y.,Institute of Photonics and Optical Science IPOS | Schroder J.,Institute of Photonics and Optical Science IPOS | Van Erps J.,Institute of Photonics and Optical Science IPOS | Van Erps J.,Vrije Universiteit Brussel | And 5 more authors.
Optics Express | Year: 2011

We report the demonstration of automatic higher-order dispersion compensation for the transmission of 275 fs pulses associated with a Tbaud Optical Time Division Multiplexed (OTDM) signal. Our approach achieves simultaneous automatic compensation for 2nd, 3rd and 4th order dispersion using an LCOS spectral pulse shaper (SPS) as a tunable dispersion compensator and a dispersion monitor made of a photonic-chip-based all-optical RF-spectrum analyzer. The monitoring approach uses a single parameter measurement extracted from the RF-spectrum to drive a multidimensional optimization algorithm. Because these pulses are highly sensitive to fluctuations in the GVD and higher orders of chromatic dispersion, this work represents a key result towards practical transmission of ultrashort optical pulses. The dispersion can be adapted on-the-fly for a 1.28 Tbaud signal at any place in the transmission line using a black box approach. © 2011 Optical Society of America.


Kabakova I.V.,Institute of Photonics and Optical Science IPOS | Walsh T.,Institute of Photonics and Optical Science IPOS | De Sterke C.M.,Institute of Photonics and Optical Science IPOS | Eggleton B.J.,Institute of Photonics and Optical Science IPOS
Journal of the Optical Society of America B: Optical Physics | Year: 2010

We compare the performance of two well-known all-optical switching schemes based on fiber Bragg gratings: a uniform grating and a grating with a π phase shift. We express their performance in terms of linear measures: the intensity enhancement inside the grating, which lowers the nonlinear threshold, and the relative resonance bandwidth, which determines the device's response time. We show that in both grating types, the product of the enhancement and the relative bandwidth is proportional to the refractive index contrast, and that it is superior for a phase-shifted grating. We also evaluate the sensitivity of the devices to loss. We confirm results of our analysis by simulating nonlinear coupled-mode equations. More generally, our results indicate the advantage of structures with a high refractive-index contrast for all-optical switching. © 2010 Optical Society of America.


Husko C.,Institute of Photonics and Optical Science IPOS | Eggleton B.J.,Institute of Photonics and Optical Science IPOS
Optics Letters | Year: 2012

We compare the energy performance of four-wave mixing in nanowires and slow-light photonic crystals and outline the regimes where each platform exhibits salient advantages and limitations, including analysis of the impact of future fabrication improvement. These results suggest a route towards energy efficient silicon integrated photonics. © 2012 Optical Society of America.

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