Codoped Phosphate Glass Waveguide Amplifier Research Articles

EFFECT OF TRANSMISSION FUNCTION OF CASCADED MULTILAYER MEDIUM THIN FILM FILTER ON Er–Yb CO-DOPED WAVEGUIDE AMPLIFIERS

Modeling and amplification of erbium–ytterbium co-doped phosphate glass waveguide amplifier with a cascaded multilayer medium thin film filter is investigated theoretically. This proposed filter consists of some different filtering unit cells with different central wavelength and bandwidth, and each cell can suppress certain peak gain at a specific wavelength. The intrinsical gain spectrum of amplifier is obtained by solving a set of rate and power propagation equations, the effect of transmittance spectrum of thin film filter on flattening gain is discussed, and the transmission function of cascaded multilayer medium thin film filter is obtained.

Design and Simulation of Broadband IR integrated Waveguide Amplifiers with Long - Period Waveguide Grating Filter

A novel broadband IR integrated Er-Yb codoped phosphate glass waveguide amplifier with a long-period waveguide grating is proposed. The long-period waveguide grating, which is used as a gain equalizer, is directly fabricated in the waveguide. The amplifier model is based on propagation and population-rate equations and includes both uniform and pair-induced up-conversion mechanisms. It is solved numerically by combining overlapping integral and Runge-Kutta(RK) algorithm. The intrinsical gain spectrum of the proposed amplifier is obtained by solving a set of rate and power propagation equations and, the deleterious gain peaking is reduced by the long-period waveguide grating filter. The effects of transmission spectrum of the proposed long-period grating on flattening gain are discussed. An average gain ~ 20dB between 1532 nm and 1565 nm with gain difference of < 3dB is achieved.

S-Type Er-Yb Co-doped Phosphate Glass Waveguide Amplifier Integrated with Thin-film Filter

A new S-type of wideband erbium-ytterbium co-doped phosphate glass waveguide amplifier integrated with medium thin film filter is proposed, this S-type geometry waveguide structure is used to achieve a long path in a compact chip, and obtained higher gain with lower Er-doped concentration, and the medium thin film filter is utilized to achieve the built-in suppression of 1.53pm gain peak to obtain larger flattening gain bandwidth. The intrinsical gain spectrum is obtained by solving rate and power propagation equations, the effect of transmittance spectrum of thin film filter on flattening gain is discussed.

Modeling and Simulation of Saturation Gain of IR Integrated Photonic Amplifiers

IR integrated photonic amplifiers at 1.55μm operation will have good foreground in optical phased‐array radars for splitters and signal processing. The saturation gain characteristics of IR integrated photonic waveguide amplifiers (taken Er3+‐Yb3+ co-doped phosphate glass waveguide amplifiers as an example) are studied theoretically. For the home‐made laser glass materials the calculated saturation intensities are 2.22kw /cm2 for signal and 10.15kw/cm2 for pump. The effects of absorption saturation of signal and pump lights on the gain of amplifiers are discussed.

Er/sup 3+/-Yb/sup 3+/ codoped phosphate glass waveguide amplifier using Ag/sup +/-Li/sup +/ ion exchange

An Er/sup 3+/-Yb/sup 3+/ codoped phosphate glass waveguide amplifier using an Ag/sup +/-Li/sup +/ ion exchange process is demonstrated. The glass contains Li/sup +/ instead of Na/sup +/ and the spectroscopic properties were characterized. The emission parameters were calculated, and the radiative quantum efficiency of the <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sup> I/sub 13/2/ to <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sup> I/sub 15/2/ transition is estimated to be /spl sim/100 %. The planar glass waveguide amplifier produces a net gain /spl sim/3.3 dB/cm with an input signal wavelength of 1.535 μm at a power of -40 dBm, for 120 mW of 980-nm pump power.