Efficient backward and forward pumping CW Raman amplification for InGaAsP laser light in silica fibres
Abstract
Direct laser diode (LD) light CW amplification in a fiber is an attractive technology for wideband, ultra-long distance optical transmission systems. Washio et al. (1982) have reported efficient but pulsed amplification for InGaAsP LD light via a four-photon mixing process in a single-mode silica fiber. However, CW amplification via the four-photon mixing process appears to be difficult. The present investigation is concerned with efficient CW Raman amplification for InGaAsP LD light in small-core silica fibers, several kilometers long. Unsaturated Raman gain as high as 21 dB has been obtained in both backward and forward pumping configurations. No noticeable spectral distortion in amplified signal LD light has been observed. By considering as short as 1 ps expected response time, the Raman amplification in fibers could be very promising for future ultra-long-distance wideband optical transmission systems.
- Publication:
-
Electronics Letters
- Pub Date:
- August 1983
- DOI:
- 10.1049/el:19830423
- Bibcode:
- 1983ElL....19..620A
- Keywords:
-
- Continuous Wave Lasers;
- Energy Conversion Efficiency;
- Fiber Optics;
- Light Amplifiers;
- Optical Pumping;
- Semiconductor Lasers;
- Glass Fibers;
- Integrated Optics;
- Neodymium Lasers;
- Optical Waveguides;
- Photonics;
- Quaternary Alloys;
- Raman Spectra;
- Silica Glass;
- Yag Lasers;
- Lasers and Masers