Optical amplifiers – devices where light signals are periodically amplified along their transmission paths in a network- have revolutionized communications using optical fibres and have had a major impact on the information revolution and the building of the Internet. Even though optical fibres can be used to carry massive amounts of information, it is expected that the growth of data usage will result in capacity exhaustion in the coming decades if no breakthrough technology is introduced. One such disruptive technology could well be a new type of optical amplifier that selectively amplifies the signal depending on its phase. Such a “phase sensitive amplifier” (PSA) has been theoretically shown to be able to provide amplification while adding minimum noise to the signal. It will also be a useful tool to periodically “clean” signal distortion and noise accumulated over a link. Currently, those impairments limit the range and capacity of optical fibre links. PSAs are eminently attractive since one major trend in optical communication is the introduction of advanced modulation formats that mimic those that have made the breakthrough of digital wireless communication a reality. In this context, being able to process both the amplitude and phase of the signal all-optically will open the way to new functionalities, including the periodic regeneration of the phase of high bit rate (>40 Gbit/s) signals, which has not been demonstrated so far. However, the implementation of such amplifiers is known to be difficult. Nevertheless, a few sound approaches which overcome some of their practical limitations have been suggested over the past few years. It is therefore now time to revisit the concepts and applications of PSAs and to experimentally demonstrate some of their functionalities for the first time, which are the goals of this project.
|Effective start/end date||01/09/2009 → 31/08/2012|
- Optical communication systems
- optical amplifiers
- optical modulation
- optical signal processing