L波段高掺铒光纤超荧光光源

采用半导体激光二极管泵浦12cm长高掺铒光纤,在双程前向装置中,获得了10.8mW最大超荧光输出功率,斜率效率10.6%,在1553.1~1588.6nm接近36nm的范围内,功率抖动小于0.2dBm。作为比较,在相同实验条件下泵浦10cm长的高掺铒光纤,结果显示输出光谱带宽明显下降,C波段的放大自发辐射远大于L波段的,由此也证明了L波段的放大自发辐射是由C波段的放大自发辐射泵浦产生的。

L-band High Erbium-doped Fiber Superfluorescent Source

Broadband optical sources with short coherence length, low spectral ripples and high spectral intensity are desirable for various applications such as fiber-optic gyroscope (FOG), optical noise sources in EDFA measurement systems, optical sensor systems, spectrum-sliced sources and component testing sources to sliced spectrum sources for lower-cost access networks. Such a source must be broadband in order to reduce errors due to coherent backscattering, polarization cross coupling and the Kerr effect. Sources based on the amplified spontaneous emission (ASE) from an erbium-doped fiber are promising than light emitting diode (LED) and superluminescent light emitting diode (SLED) because of the high output pump, broadband, and spectrum stability. The power produced by the superluminescent diode and LED is also difficult to couple into single-mode fibers. Superfluorescence sources(SFS) on the ASE from an erbium-doped fiber are attractive because of the intrinsic broad emission spectrum and the high output power can be generated easely using semiconductor LD pumps. The SFS designer can control the source spectrum, stability and power through a choice of source configuration, pump power, and fiber length. Various configurations have been considered for the SFS system, depending on the presence of reflections from the fiber ends as well as the propagation direction of the pump wave relative to the propagation direction of the utilized source output. SFSs with two nonreflecting ends are single-pass devices, while those with a reflector at one end are double-pass devices. The output from the pump end of the SFS is the backward signal, while the output from the opposite end is the forward signal. The experimental results using double-pass forward configuration on high erbium-doped fiber SFS pumped by 980 nm laser diode are reported. The maximum superfluorescent output power is 10.8 mW with the slope efficiency of 10.6%, while pump power is 380 mW. The power stability is 0.02 dB in 1 553.1~1 588.6 nm near 36 nm range, 3 dB bandwidth is 84.2 nm.