Recently, most of the difficult problems which prevented the realization of soliton communication have been solved by using new optical amplifiers, the so-called erbium-doped optical fiber amplifiers (EDFAs). These amplifiers can provide a larger gain with a smaller pumping power than the Raman process. In this paper, we describe how we were able to realize an actual soliton transmission system which utilizes lumped amplifiers instead of distributed amplifiers. A data transmission experiment at 10 Gb/s over 300 km is presented. In order to realize a Tera b/s communication system, it is also important to investigate and establish a key technology for the generation of femtosecond optical pulses. Here, generation of high power pulses as short as 14 fs and 1.3 approximately 1.6 μm infrared femtosecond pulses using the difference frequency method are described. Finally, short pulse amplification characteristics in EDFAs are presented.
|Number of pages||10|
|Journal||NTT R and D|
|Publication status||Published - 1991 Jan 1|
ASJC Scopus subject areas
- Electrical and Electronic Engineering