Title :
Erbium-doped optical fiber amplifiers pumped in the 660- and 820-nm bands
Author :
Horiguchi, Masaharu ; Yoshino, Kaon ; Shimizu, Makoto ; Yamada, Makoto ; Hanafusa, Hiroaki
Author_Institution :
NTT Opto-Electron. Labs., Ibaraki, Japan
fDate :
5/1/1994 12:00:00 AM
Abstract :
State-of-the-art erbium (Er)-doped optical fiber amplifiers (EDFA´s) pumped in the 660- and 820-nm bands are described. We have demonstrated highly efficient EDFA´s incorporating optimized 664- and 827-nm pump wavelengths and an Er-doped high numerical aperture (NA) fiber with thermally diffused expanded core (TEC) fiber ends. Gain coefficients of 3.8 and 1.3 dB/mW at respective wavelengths of 664 and 827 nm were achieved at a signal wavelength of 1535 nm. Noise figures of 3.1 and 4.1 dB at respective pump wavelengths of 670 and 827 nm were obtained at a signal wavelength of 1535 nm. A highly efficient Er-doped fiber amplifier module, in which an AlGaInP visible laser diode (LD) was used as the pump source, was successfully developed as a practical application of this technology. A maximum overall gain coefficient of 3.0 dB/mW was achieved at a signal wavelength of 1535 nm. The EDFA module realized a maximum overall signal gain of 33 dB at 1535 nm with a saturated output power of -1 dBm. A maximum saturated output power of 3.9 dBm was obtained at a signal wavelength of 1552 nm. The present EDFA design using a low-cost laser diode for optical disk memory use and a high NA Er-doped fiber has great potential for providing inexpensive, high-performance EDFA´s
Keywords :
erbium; fibre lasers; optical communication equipment; optical pumping; optical saturation; 1535 nm; 1552 nm; 660 nm; 820 nm; AlGaInP visible laser diode; EDFA´s; Er-doped high numerical aperture fiber; Er-doped optical fiber amplifiers; erbium-doped optical fiber amplifiers; expanded core; fiber ends; gain coefficients; high NA Er-doped fiber; maximum overall gain coefficient; noise figures; optical disk memory; optimized pump wavelengths; pump source; pump wavelengths; respective pump wavelengths; saturated output power; signal wavelength; thermally diffused; Apertures; Diode lasers; Erbium; Erbium-doped fiber amplifier; Laser excitation; Noise figure; Optical fiber amplifiers; Optical fibers; Power generation; Thermal expansion;
Journal_Title :
Lightwave Technology, Journal of