Multi-Band Programmable Gain Raman Amplifier

Optical communication systems, operating in C-band, are reaching their theoretically achievable capacity limits. An attractive and economically viable solution to satisfy the future data rate demands is to employ the transmission across the full low-loss spectrum encompassing O, E, S, C, and L band of the single mode fibers (SMF). Utilizing all five bands offers a bandwidth of up to sim53.5 THz (365 nm) with loss below 0.4 dB/km. A key component in realizing multi-band optical communication systems is the optical amplifier. Apart from having an ultra-wide gain profile, the ability of providing arbitrary gain profiles, in a controlled way, will become an essential feature. The latter will allow for signal power spectrum shaping which has a broad range of applications such as the maximization of the achievable information rate × distance product, the elimination of static and lossy gain flattening filters (GFF) enabling a power efficient system design, and the gain equalization of optical frequency combs. In this paper, we experimentally demonstrate a multi-band (S+C+L) programmable gain optical amplifier using only Raman effects and machine learning. The amplifier achieves >1000 programmable gain profiles within the range 3.5 to 30 dB, in an ultra-fast way and a very low maximum error of 1.6 cdot 10{-2} dB/THz over an ultra-wide bandwidth of 17.6-THz (140.7-nm)

Noise and transmission performance improvement of broadband distributed Raman amplifier using bidirectional Raman pumping with dual order co-pumps

We demonstrate a low noise bidirectional broadband distributed Raman pumping scheme combining dual order co-propagated pumps without increasing the signal RIN level. The noise performance improvement is compared experimentally and numerically with conventional counter-pumping only and bidirectional pumping with only a 2nd order co-pump for a 70nm bandwidth and 61.5km distributed Raman amplifier. The proposed broadband pumping scheme shows 1.2dB maximum noise figure improvement and extends the long-haul transmission reach up to 6150km with a Q-factor improvement of ~0.7dB compared with counter-pumping only scheme

Impact of front-FBG reflectivity in raman fiber laser based amplification

2 pags., 3 figs. .-- OCIS codes: (060.2320) Fiber optics amplifiers and oscillators; (060.2330) Fiber optics communications. .-- CLEO: Science and Innovations, San Jose, California United States, 5–10 June 2016We experimentally analyze the impact of front-FBG reflectivity in ultra-long Raman laser amplifiers performance, showing Q-factor penalties in excess of 1 dB for FBG reflectivities above 10% in a 30 GBaud DP-QPSK transmission system.Peer reviewe

Noise performance improvement of broadband distributed raman amplifier using dual order bidirectional pumping

Wuhan China, 2–5 November 2016A low-noise broadband bidirectional Raman pumping scheme combining dual order co-pumps is proposed. The improved noise figure without RIN increase is compared experimentally and numerically with conventional pumping schemes for distributed amplification over 70 nm.Peer Reviewe

Multi-band programmable gain Raman amplifier for high-capacity optical networks

The paper presents recent advances in the design of controllable, highly accurate, and multi-band Raman gain profiles. The ultra-wideband programmable gain profiles are implemented using a machine learning approach based on the mapping between gain profiles and pump powers