Ultralong Raman Fiber Lasers as Virtually Lossless Optical Media

Abstract

By transforming the optical fiber span into an ultralong cavity laser, we experimentally demonstrate quasilossless transmission over long (up to 75 km) distances and virtually zero signal power variation over shorter (up to 20 km) spans, opening the way for the practical implementation of integrable nonlinear systems in optical fiber. As a by-product of our technique, the longest ever laser (to the best of our knowledge) has been implemented, with a cavity length of 75 km. A simple theory of the lossless fiber span, in excellent agreement with the observed results, is presented.

Mode-Locked Fibre Lasers with High-Energy Pulses

“…This method is well suited for fibre lasers whose resonator length may reach dozens (Ania-Castañón et al, 2006;Ivanenko et al, 2010) and even hundreds of km (Ania-Castañón, 2009). This allows generation in mode-locked lasers of the highest-energy pulses possible for this type of lasers.…”

The analysis of the error statistics in a 5 × 40 Gbit/s fibre link with hybrid amplification

“…The coding method presented here can be used in conjunction with specially designed transmission schemes based on ultra-long fiber lasers (see e.g. [22]- [24]) to enable FEC schemes to correct errors beyond their effective limits.…”

Hybrid gain-flattened and reduced power excursion scheme for distributed Raman amplification

“…To achieve this, quasi-lossless amplification schemes have been proposed which allow very low signal power variations along the transmission spans [2][3][4][5][6]. Here we further develop this technique by combining, in an optimized manner, one 2nd-order pump at 136X nm and two 1st-order pumps at 14XX nm to achieve simultaneous spectral gain flatness and minimal signal power excursion during transmission.…”