S.J. Wilson

The effect of composition on the emission spectra of Tm3+-doped tellurite glasses for an S-band amplifier operating at 1.46 μm

Abstract Emission spectrum of Tm3+ doped tellurite glasses for the 3H4–3F4 transition at 1.46 μm has been measured at room temperature and at 5 K. The glass compositions have a major influence on the spectral change, especially in the longer wavelength part of the emission. The effect of different Tm3+ concentrations on the upper and lower level lifetimes and on the emission spectrum has also been reported for designing a broadband multi-channel S-band TDFA.

Pump induced inhomogeneity of gain spectra in conventional and extended-band EDFAs

We present results on spectral gain changes resulting from small changes of pump wavelength in erbium-doped fiber amplifiers (EDFAs). While conventional-band EDFAs exhibit a significant effect with 980-nm pumping and a smaller effect with 1480 nm, it is absent for extended-band EDFAs operating around 1585 nm.

Thulium-doped tellurite glasses for S-band amplification

The advantages of tellurite glass hosts for Tm-doped S-band gain media are investigated. Comparisons are made with fluoride hosts and the ability to control bandwidth. by choice of tellurite glass composition is demonstrated.

Broad-band amplification using a novel amplifier topology

A new broad-band amplifier topology that provides a continuous gain across 75 nm (1528-1603 nm) of optical bandwidth using Er/sup 3+/-doped SiO/sub 2/ fiber is demonstrated. The noise figure is low and does not present any discontinuity across the entire amplification bandwidth. The topology has a buried 1550/1585-nm splitter to reduce input signal loss and to provide amplified spontaneous emission suppression. The topology has been optimized using hybrid fiber; Er/sup 3+/-doped SiO/sub 2/ for the first stage and Er/sup 3+/-doped TeO/sub 2/ for the second stage, achieving 82 nm (1526-1618 nm) of optical bandwidth.

Dependence of L-band amplifier efficiency on pump wavelength and amplifier design

An improvement in amplifier efficiency resulting from pump wavelength tuning is shown to occur in extended band (L-band) EDFAs. We investigate the effects for different EDFA configurations and for 980 nm and 1480 nm pumping.

A new method to determine the Er-fibre gain coefficient from dynamic gain tilt technique

A new method to determine the Er-fiber gain coefficient is presented using a dynamic gain tilt technique. Results demonstrate that this method is very simple, highly accurate, and especially useful for long-wavelength erbium-doped fiber amplifier.

Tm-doped fiber amplifiers in the 1480nm region with 980nm/1550nm pumps

This work reports a substantial optical gain in Tm doped fiber in the region of 1450-1500 nm, with dual wavelength pumps in 980 nm and 1550 nm ranges. Pump sources employedare semiconductor lasers and all passive components in the amplifier are commonly found in EDFAs.

Experimental correlation of the extended-band EDFA with an optimized numerical model using a dynamic gain tilt technique

We present theoretical and experimental verification of an optimized erbium-doped fiber amplifiers model in the extended band with an emission coefficient derived from a dynamic gain tilt technique. The validity of the method has been verified with two different erbium fibers.