The capacity of Erbium-doped amplifiers (EDFA) systems is rapidly being approached, and thus research is increasing in alternative technologies which can deliver broader gain spectrum than EDFAs to increase system capacity [1]. Fiber Raman Amplifiers (FRAs) provide gain in any spectral region provided that a suitable pump and fiber are available. Distributed amplifiers using the transmission fibre as a gain medium are used to improve noise performance but discrete Raman amplifiers also have the capability of extending the optical telecommunication bandwidth. Broadband gain can be achieved if multiple pumps are employed, however, gain flatness needs appropriate design of multi-pump configuration. In this experiment as shown in 1a, nonlinearity was used to spectrally broaden a 1455nm first order pump by propagating through a short length of TrueWave fiber with zero dispersion wavelength near the pump wavelength [2]. A very low power of the broadened pump was then used as a seed for the 1365nm second order pump, to counter-pump the gain fiber in this way a flattened Raman gain profile over 40 nm bandwidth can be achieved. The Raman gain fiber used was, 4.5km Inverse Dispersion Fiber (IDF), with attenuation 0.23dB/km, dispersion −44 ps/nm/km at 1550nm, dispersion slope −0.128 ps/nm2/km, and effective core area 31 μm2. The remnant pump was filtered via a second WDM coupler and dumped via an angled connector. The total loss for the Raman amplifier was ~ 4dB and on-off gain can be as high as 25dB depending on the pump powers.

© 2017 IEEE

PDF Article
More Like This
Gain-flattened gain-clamped discrete Raman amplifier

S. S-H. Yam, M. E. Marhic, Y. Akasaka, and L. G. Kazovsky
CTuK5 Conference on Lasers and Electro-Optics (CLEO) 2004

High power-conversion-efficiency operation of discrete Raman amplifiers using high Raman gain fiber and its bandwidth dependence

A. Oguri, Y. Taniguchi, R. Sugizaki, T. Yagi, and S. Namiki
OTuA6 Optical Amplifiers and Their Applications (OAA) 2004

S-band discrete Raman amplifier using high Raman gain fiber

Y. Taniguchi, Y. Emori, A. Oguri, R. Sugizaki, M. Sakano, and T. Yagi
TuA2 Optical Amplifiers and Their Applications (OAA) 2005


You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
Login to access Optica Member Subscription