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A novel type of hybrid amplifier/wavelength converter is presented, coupling a TDFA and a FOPA module in series. Signal amplification over the entire S-Band (1450-1530 nm) and signal-to-idler conversion from 1540-1630 nm is demonstrated.
A cladding-pumped, high-power amplifier was built incorporating a star-shaped, Ybdoped filter fiber. Pulsed amplifier measurements demonstrate strong suppression of stimulated Raman scattering accomplished by a special index profile with an up-doped ring.
We report a high power diode-pumped mid-IR fiber amplifier at 2.7 mum. 4.6 W amplified signal was obtained for an input signal of 110 mW, corresponding to a net gain of 16.2 dB.
We have derived an explicit analytical expression for the gain of a Brillouin fiber amplifier operating in the depleted pump regime. The accuracy of the obtained formula is validated both numerically and experimentally.
Employing all-optical means to prepare phase-coherent input signal-idler pairs, we implement a multichannel in-line phase-sensitive fiber-parametric amplifier. Feasibility of three-channel operation using a single pump is demonstrated.
Using an accurate full-vectorial finite element method, a realistic model of a fabricated dispersion compensating photonic crystal fiber is analyzed. An almost flat Raman-gain spectrum (gain-ripples at just plusmn0.48-dB) is obtained using a single pump.
We have demonstrated a polarization-interleaved WDM system with a two-orthogonal-pump OPA (2OP-OPA). The sensitivity has been improved by about 2 dB compared to its counterpart with all WDM channels co-polarized with the same signal gain.
We propose a novel design for making the gain of single-pump, fiber-optic parametric amplifiers polarization independent. We show that under suitable conditions, signal gain varies by < 0.1 dB as its polarization varies.
Third order cascaded Raman shifting is used to generate light to 1867 nm in sulfide fibers, and the nonlinearity is measured to be ~5.7 times 10-12 (m/W). Damage at ~1 GW/cm2 limits the wavelength shift range.
We demonstrate engineered refractive index profiles for the mitigation of nonlinear optical impairments such as stimulated Raman scattering and stimulated Brillouin scattering. These fibers offer performance improvements over conventionally used large mode area fibers.
Performance of tunable buffers based on optical amplifiers and its improvement using gain flattening is analyzed. A simple analytical expression indicates that to store more than a couple of bits unrealistically high gain is required.
We describe a beam cleanup setup to convert a multimode beam into a singlemode beam by stimulated-Brillouin-scattering in a multimode gradient-index fiber. A M2=6.5 beam is converted into a M2=1.3 beam with 31% efficiency.
We report optical amplification in a bismuth-doped silica fiber at 1308 nm with 810 nm excitation and demonstrated simultaneous optical amplification at two wavelengths near 1300 nm region. This wavelength is the closest to the important telecommunications window.
An analytic model of chirped-pulse amplification is presented. The model is used to optimize the peak power in fiber chirped-pulse amplification, in which the interplay of nonlinearity and third-order dispersion plays a major role.
We demonstrate the accuracy of commercial telecommunications industry software for modelling Yb-fiber amplifiers. Simulations enabled optimisation of a broad bandwidth ultra-short pulse four-stage amplifier system. The predicted results were confirmed by experiments.
Near infrared emission with a bandwidth more than 450 nm which should be useful for ultra broadband optical amplifiers and tunable lasers for optical telecommunication, has been observed from Bi-doped lithium alumino silicate glass.
We report ultrafast amplification of mode-locked laser pulses down to a width of 710 fs at 20 and 80 GHz with a semiconductor optical amplifier, both devices based on the same quantum dot material.
Spectral shaping in a fiber amplifier with finite gain bandwidth (DeltalambdaFWHM~15nm) and strong self-phase-modulation (PhiNL~12pi) is studied numerically and experimentally. Pulses amplified to 30 muJ energy are dechirped to 250 fs duration.
We report a novel method for high-energy, few-cycle pulse generation through the combination of parametric amplification and enhancement cavities. Dispersion in the cavity ceases to be a concern with the use of long pump pulses.
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