Gain Characteristics of Lanthanum Co-Doped Erbium Fiber Amplifier,
NIPPON TELEGRAPH AND TELEPHONE CORP TAKE TRANSMISSION SYSTEMS LABS
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Recent progress on erbium-doped fiber amplifiers EDFAs and their application to optical communications has been very rapid since the EDFA has many advantages such as polarisation-insensitive high gain, a low noise-figure, and low insertion loss.1 It is well known that in order to obtain a broader and relatively flatter gain profile, Aluminum AI203 is co-doped into the core of the fibers.2,3 To make a wavelength independent flat gain profile is very important from the viewpoint of ultrashort pulse amplification and wavelength division multiplexing technique. Payne and Laming investigated a Borolanthanate co-doped EDFA.4 Although LaF3 or La2O3 were used as hosts for Nd ions5-7, detailed gain characteristics of a Lanthanum co-doped ErSiO2 fiber amplifier have not yet been clarified. In this paper, we describe for the first time the detailed gain characteristics of a Lanthanum La co-doped EDFA and compare then with those of Al codoped and non co-doped EDFAs.
- Electrical and Electronic Equipment
- Fiber Optics and Integrated Optics