Sharp tunable and additional noise-free optical filter based on Brillouin losses
Sharp tunable and additional noise-free optical filter based on Brillouin losses
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DOI：
10.1364/prj.6.000132
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发表时间：
2018-02-01
影响因子：
7.6
通讯作者：
Schneider, Thomas
中科院分区：
文献类型：
--
作者：
Feng, Cheng;Preussler, Stefan;Schneider, Thomas
本文提出了一种基于受激布里渊散射（SBS）损耗的无噪声、中心频率和带宽独立可调的光滤波器。通过抑制带外信号的两个加宽的对称SBS损耗，可调谐的通带带宽从500 MHz到9.5 GHz和独立的中心频率可调谐性被证明。考虑到中心频率范围内有限的SBS相互作用，实现了具有最小0.3dB涟漪的平顶响应。在极化牵引的额外抑制的帮助下，最大选择性达到20 dB，滚降达到250 dB/GHz。基于增益的SBS滤波器将噪声添加到经滤波的信号。然而，对于我们提出的滤波器设置，由于通带中的透明度，没有检测到额外的噪声。考虑到宽的独立带宽和中心频率的可调谐性，平顶响应，和低噪声特性，我们提出的滤波器可以完美地用作大多数商业化的常规可调谐光学单带通滤波器的补充，其最小带宽限制在10 GHz。(C)2018中国激光出版社
In this paper, we propose an additional noise-free, independent center frequency and bandwidth tunable optical filter based on stimulated Brillouin scattering (SBS) losses. By suppressing the out-of-band signal with two broadened symmetric SBS losses, tunable pass bandwidths from 500 MHz to 9.5 GHz and the independent center frequency tunability are demonstrated. Considering the limited SBS interaction in the center frequency range, a flat-top response with minimum 0.3 dB ripple is achieved. Assisted by the extra suppression from polarization pulling, a maximum selectivity of 20 dB and an ultrahigh 250 dB/GHz roll-off are reached. A gain-based SBS filter adds noise to the filtered signal. However, for our proposed filter setup, no additional noise is detected due to the transparency in the passband. Considering the wide independent bandwidth and center frequency tunability, flat-top response, and low-noise characteristic, our proposed filter can be perfectly used as a supplement of most commercialized conventional tunable optical single bandpass filters, whose minimum bandwidth is limited by 10 GHz. (C) 2018 Chinese Laser Press