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New technology and design options for broadband networks are described. A modified Arrayed Wave Guide router and long reach PON provide improved service resilience, future cost-effective capacity upgradeability and increase network coverage.
We report supercontinuum generation (SCG) in a dispersion-tailored bismuth-glass microstructured optical fibre. Simulations of near-infrared femtosecond pumping predict SCG spanning the near- and mid-infrared. Preliminary experiments show SCG from 0.8 μm to beyond 1.75 μm.
This study analyses losses associated with network architectures for power-over-fibre in distributed optical fibre smart sensor networks. We show that multiplexing communication and power signals together does not significantly affect the power generated.
The relationship between the failure strains for Fibre Bragg gratings (FBGs) and the techniques used for their fabrication, packaging and bonding is investigated to better understand the reliability and durability of FBGs for strain sensing.
Dispersion equalization of the modes of cylindrically symmetric few-mode fibres is investigated using an equivalent planar waveguide representation. By treating each mode as an independent data transmission channel, such fibres could help substantially increase the capacity of telecommunications systems.
We demonstrate dispersion compensation of a WDM 3×40 Gb/s (100 GHz spaced) RZ-DPSK signal in a 162 km standard fibre link by using optical phase conjugation via CW pumped four wave mixing in a As2S3 planar waveguide.
We present an analysis of the polarisation dependent scattering loss due to surface and sidewall roughness in thin, shallow-ridge silicon-on-insulator (SOT) waveguides using three dimensional coupled mode theory. The impact on resonant lateral leakage is discussed.
We demonstrate the inscription of Bragg gratings in the germanium-doped cladding rings of a large-mode-area, ytterbium-doped photonic-bandgap fibre. The gratings are inscribed in these doped rings that can support several modes, the refractive indices of which are derived from experiment and calculated theoretically.
A new technique for parallel imprinting of multiple optical-fibre facets is presented. Resolution of better than 15nm is demonstrated and up to 40 optical-fibres have been imprinted in parallel. A compact, portable imprinting-module exploits self alignment to accommodate non-planar, biological molds.
A novel instantaneous frequency measurement using all optical mixing is demonstrated. This system can provide a measurement of RF frequency while requiring no high speed electronic components and remoting all components of the measurement system to the receiver.
We demonstrate a silicon-chip-based radio-frequency spectrum analyser capable of measuring terabaud optical data. We investigate application to optical performance monitoring and show that free-carrier effects have a negligible impact on device operation.
A Monte Carlo simulation suggests extremely low noise can be obtained in the Ge/AlxGa1−xAs avalanche photodiodes (APDs). These APDs are versatile for multiple-wavelength detection at 850, 1310 and 1550 nm for applications in data- and tele-communications.
We demonstrate a low pressure sensor based on a fibre Bragg grating (FBG) for human skin pressure underneath compression stockings. Calibration and comparison with conventional pressure sensors is presented.
Direct grating writing was modified by adding an acousto optic modulator in the optical fibre assembly. The acoustic wave changes the properties of the fibre while the beam is scanned along the fiber, creating a complex FBG profile that depends on the acoustic driver parameters.
The spectrum of an alternative type of pi-phase-shifted Bragg grating that operates at twice the Bragg wavelength, has been analysed according to a model developed for a conventional pi-phase-shifted Bragg grating.
An optical continuum was generated in microstructured optical fibre using an incoherent pump generated by stimulated Raman scattering in a step index fibre with normal dispersion. Accelerated spectral broadening to longer wavelengths was observed.
We report Erbium doped Tellurium dioxide single-mode planar rib waveguide amplifiers with net gain and wide bandwidth operation. Peak internal gains of up to 14dB have been achieved in 5cm long rib waveguides (2.8dB/cm).
The effects of relatively small bend diameters on fibre Bragg gratings written in standard and low bend loss fibre have been investigated. Results including Bragg wavelength shifts with bending are reported.
We present a dissipative four wave mixing tunable laser based on a integrated CMOS-compatible high-Q nonlinear ring resonator, emitting subpicosecond pulses at 200GHz-repetition rate. Quasi-sinusoidal 800GHz emission regime is also demonstrated.
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