Abstract
A new erbium-doped fibre amplifier (EDFA) is demonstrated using a combination of newly developed Erbium Zirconia co-doped fiber (Zr-EDF) and the commercial silica-based Erbium-doped fiber (Si-EDF) as the gain medium. Both fibers have a very high concentration of erbium ion. A compact amplifier operating in C-band region is firstly reported using a double-pass configuration. It is shown that average gains of the proposed Zr-EDF amplifier are obtained at approximately 18 dB with a gain variation of ±2 dB within C-band region. A flat-gain and wide band operation is achieved by configuring the amplifier in two stages comprising a 2 m long Zr-EDF and 9 m long Si-EDF optimised for C- and L-band operations, respectively, in a double-pass parallel configuration. A chirp fibre Bragg grating (CFBG) is used in both stages to ensure double propagation of the signal and thus to increase the attainable gain in both C- and L-band regions. At an input signal power of 0 dBm, a flat gain of 15 dB is achieved with a gain variation of less than 0.5 dB within a wide wavelength range from 1530 to 1605 nm. The corresponding noise figure varies from 6.2 to 10.8 dB within this wavelength region.
Highlights
The tremendous growth of the internet and data traffic has created an ever-increasing demand for transmission bandwidth in optical communication systems [1]
A compact double-pass Zr-erbium-doped fibre amplifier (EDFA) and Si-EDFA operating in C-band region is demonstrated using a 57 cm long Zirconia co-doped fiber (Zr-erbium-doped fiber (EDF)) and a 73 cm long silica-based Erbium-doped fiber (Si-EDF), respectively as a gain medium
It is found that the Zr-EDFA is more efficient than the Si-EDFA
Summary
The tremendous growth of the internet and data traffic has created an ever-increasing demand for transmission bandwidth in optical communication systems [1]. The wide-band amplifier is constructed by cascading two amplifiers, where the input signal is first de-multiplexed into different bands by the wavelength division multiplexing (WDM) coupler, amplified by amplifiers that are suitable for the corresponding wavelength band, and multiplexed again with another WDM coupler This type of hybrid amplifier has the advantage of extensibility, in which one amplifier can initially work independently while another amplifier can be added into the system according to the demand for expansion. Extensive research has been done on a new erbium-doped fiber amplifiers (EDFAs) using various host and co-dopant materials such as silica, alumina, telluride, phosphate, bismuth and others to improve the gain performance, compactness, gain bandwidth, and cost of the devices [13, 14]. A cascaded amplifier in both parallel and series configuration is proposed for flat-gain and wide-band operation
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