Tunable microwave output over a wide RF region generated by an optical dual-wavelength fiber laser
Tunable microwave output over a wide RF region generated by an optical dual-wavelength fiber laser
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DOI：
10.1088/1054-660x/24/10/105116
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发表时间：
2014-10
期刊：
影响因子：
1.2
通讯作者：
M. Soltanian;H. Ahmad;C. Pua;S. Harun
中科院分区：
文献类型：
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作者：
M. Soltanian;H. Ahmad;C. Pua;S. Harun
双波长光纤激光器为微波信号的产生提供了一个紧凑、稳健、稳定的平台。利用双波长产生微波辐射的两种方法在这项工作中进行了探索，两者都利用了外差拍技术。两种方法都是基于掺铒光纤的环形光纤激光器，在1531 nm处吸收系数为16.0 ~ 20.0 dBm，在980 nm处吸收系数为11.0 ~ 13.0 dBm，作为有源增益介质。采用直径为4.37 μm、直径为5.06 μm、间距为5.52 μm、长10cm的光子晶体光纤实现双波长输出。一个带宽为0.8 nm的可调谐带通滤波器与偏振控制器一起作为调谐机构。通道间距可窄至0.00043 nm，微波输出约为671.9 MHz。此外，通道间距可以扩展到0.03631 nm，使微波发射超过4.59 GHz。输出非常稳定，在22分钟的测试周期内，功率或波长几乎没有变化。
The dual-wavelength fiber laser provides a compact, robust and stable platform for the generation of microwave signals. Two approaches towards generating microwave emissions using dual wavelengths are explored in this work, with both exploiting the heterodyning beat technique. Both approaches are based on a ring fiber laser with an erbium-doped fiber, having absorption coefficients of 16.0–20.0 dBm at 1531 nm and 11.0–13.0 dBm at 980 nm, serving as the active gain medium. A 10 cm long photonic crystal fiber with a solid core diameter of 4.37 μm and surrounded by air holes of 5.06 μm diameter with a separation of 5.52 μm between them serves to create the desired dual-wavelength output. A tunable band pass filter with bandwidth of 0.8 nm serves as a tuning mechanism together with a polarization controller. Channel spacings as narrow as 0.00043 nm can be realized, giving a microwave output of about 671.9 MHz. Furthermore, the channel spacing can be extended to as large as 0.03631 nm, giving a microwave emission in excess of 4.59 GHz. The output is highly stable, with little change in power or wavelength observed over a test period of 22 min.