Broadband wavelength conversion at 40Gb/s using long serpentine As2S3 planar waveguides

We demonstrate broadband wavelength conversion of a 40 Gb/s return-to-zero signal by cross-phase modulation in a newly developed chalcogenide glass waveguide based photonic chip. These new serpentine As2S3 waveguides offer a nonlinear coefficient ≈1700 W-1km-1 with 5× lower propagation loss over a length of 22.5 cm which ensures the full propagation length contributes towards the nonlinear process. This reduces the peak operating power thereby allowing a ×4 increase in the data rate compared with previous results. Spectral measurements show the device operates over a span of 40 nm while system measurements show just over 1 dB of power penalty at a bit-error rate of 10-9. This is primarily due to the compact planar waveguide design which minimizes the effect of groupvelocity dispersion

Long, low loss etched As2S3 chalcogenide waveguides for all-optical signal regeneration

We report on the fabrication and optical properties of etched highly nonlinear As2S3 chalcogenide planar rib waveguides with lengths up to 22.5 cm and optical losses as low as 0.05 dB/cm at 1550 nm - the lowest ever reported. We demonstrate strong spectral broadening of 1.2 ps pulses, in good agreement with simulations, and find that the ratio of nonlinearity and dispersion linearizes the pulse chirp, reducing the spectral oscillations caused by self-phase modulation alone. When combined with a spectrally offset band-pass filter, this gives rise to a nonlinear transfer function suitable for all-optical regeneration of high data rate signals

All optical wavelength conversion via cross phase modulation in chalcogenide glass rib waveguides

We demonstrate all-optical wavelength conversion in a 5 cm As2S3 chalcogenide glass rib waveguide with 5.4 ps pulses over a wavelength range of 10 nm near 1550 nm. We present frequency resolved optical gating (FROG) measurements that show good converted pulse integrity in terms of amplitude and phase in the frequency and time domains. The short interaction length ensures that dispersion induced walkoff does not hinder the conversion range of the device

Higher order mode conversion via focused ion beam milled Bragg gratings in Silicon-on-Insulator waveguides

We report the first Bragg gratings fabricated by Focused Ion Beam milling in optical waveguides. We observe striking features in the optical transmission spectra of surface relief gratings in silicon-on-insulator waveguides and achieve good agreement with theoretical results obtained using a novel adaptation of the beam propagation method and coupled mode theory. We demonstrate that leaky Higher Order Modes (HOM), often present in large numbers (although normally not observed) even in nominally single mode rib waveguides, can dramatically affect the Bragg grating optical transmission spectra. We investigate the dependence of the grating spectrum on grating dimensions and etch depth, and show that our results have significant implications for designing narrow spectral width gratings in high index waveguides, either for minimizing HOM effects for conventional WDM filters, or potentially for designing devices to capitalize on very efficient HOM conversion

Ultrafast all-optical chalcogenide glass photonic circuits

Chalcogenide glasses offer large ultrafast third-order nonlinearities, low two-photon absorption and the absence of free carrier absorption in a photosensitive medium. This unique combination of properties is nearly ideal for all-optical signal processing devices. In this paper we review the key properties of these materials, outline progress in the field and focus on several recent highlights: high quality gratings, signal regeneration, pulse compression and wavelength conversion

High-performance Bragg gratings in chalcogenide rib waveguides written with a modified Sagnac interferometer

This paper was published in Journal of the Optical Society of America B-Optical Physics and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/abstract.cfm?URI=josab-23-7-1323. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.Mehrdad Shokooh-Saremi, Vahid G. Ta'eed, Neil J. Baker, Ian C. M. Littler, David J. Moss, Benjamin J. Eggleton, Yinlan Ruan, and Barry Luther-Davie

Chalcogenide glass advanced for all-optical processing

By the 1990s, the only way to expand the band width of optical systems was to increase the capacity of transmission systems. But the introduction of wavelength multiplexing (WDM), researchers begun to look into processing signals optically. Thereby, mor

All-Optical Wavelength Conversion of 80 Gb/s Signal in Highly Nonlinear Serpentine Chalcogenide Planar Waveguides

Newly developed 22 cm long, serpentine shaped AS2S3 waveguide exhibiting record low loss of 0.05 dB/cm and ultra-high nonlinearity of 1700 W-1km-1 enables all-optical wavelength conversion of an 80 Gb/s return-to-zero signal via cross-phase modulation

Long-period gratings in chalcogenide (As 2 S 3 ) rib waveguides

Long-period gratings in highly nonlinear chalcogenide gloss (As 2S3) rib waveguides arc fabricated. A strong resonance of ∼17 dB depths and 3 dB width of ∼ 15 nm is obtained at a wavelength of 1525 nm by coupling the fundamental mode to the HE02 mod