Journal article
Pump-induced refractive index modulation and dispersions in Er3+-doped fibers
A novel measurement system provides determination of pump induced phase shifts in erbium doped fibers with an accuracy of ~π/20. Using this system, a systematical analysis of the pump induced modulation of the refractive index and dispersions for a signal at 1550 nm and a pump at 980 nm is reported.
The analysis contains measurements of pump induced refractive index changes as function of wavelength, pump power, and doping concentration. A model taking account of the contribution to the refractive index changes from optical transitions between 4 I15/2 states and 4I13/2 states in Er3+ yields good agreement to experimental results apart from a wavelength independent offset.
The offset is interpreted to originate from high energetic optical transitions. The results show that for a large refractive index modulation, a short and highly doped fiber should be used with limited amplified spontaneous emission effect. In optical communication systems comprising erbium doped fiber amplifiers, a tradeoff between dispersion and amplification must be made
| Language: | English |
|---|---|
| Publisher: | IEEE |
| Year: | 1996 |
| Pages: | 732-738 |
| ISSN: | 15582213 and 07338724 |
| Types: | Journal article |
| DOI: | 10.1109/50.495152 |
1550 nm 980 nm Er/sup 3+/-doped fibers Erbium Optical fiber communication Optical pumping Optical refraction Optical variables control Phase measurement Power measurement Refractive index Signal analysis Wavelength measurement accuracy amplification dispersions doping concentration erbium erbium doped fiber amplifiers fibre lasers high energetic optical transitions highly doped fiber limited amplified spontaneous emission effect measurement system optical communication systems optical fibre dispersion optical fibre testing optical modulation optical pumping optical transitions pump induced phase shifts pump power pump-induced refractive index modulation refractive index short fiber superradiance wavelength dependence wavelength independent offset
