Compact microstrip antenna

✍ Scribed by Choon Sae Lee; Young R. Cha; Chanam Lee

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 79 KB
• Volume: 48
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/mop.21265

✦ Synopsis

980-nm pumped amplifiers [10,11]. However, the experimental PCEs are highly dependent on the optimization of the design itself. For instance, if the pump power of 980-and 1480-nm laser diodes are fixed while changing the EDF length, the 980-nm laser diode is efficient in producing high power at shorter EDF lengths compared to the 1480-nm pumped amplifier [7]. This is due to the ability of the pump photons to excite ions from the ground level in order to create population inversion, which is strongly dependent on the absorption coefficient.

CONCLUSION

Highly saturated EDFAs pumped at 980 nm have been demonstrated for high-power amplifier applications. Design optimization of this EDFA has been performed, where the optimized length of the erbium-doped fiber for the experiment is 14 m. The output power greater than 22.3 dBm from 1529 to 1561 nm was obtained at 300-mW pump power. The highest output power of 22.6 dBm was measured at 1549 nm, corresponding to PCE of 60%. In this case, a PCE result of larger than 50% was recorded for the whole range of signal wavelengths, leading to QCE of larger than 80%.