Avino Saverio, Barnes Jack A, Gagliardi Gianluca, Gu Xijia, Gutstein David, Mester James R, Nicholaou Costa, Loock Hans-Peter
Istituto Nazionale di Ottica, Via Campi Flegrei 80078 Pozzuoli, Napoli, Italy.
Opt Express. 2011 Dec 5;19(25):25057-65. doi: 10.1364/OE.19.025057.
A low-noise transducer based on a fiber Fabry-Perot (FFP) cavity was used as a pickup for an acoustic guitar. A distributed feedback (DFB) laser was locked to a 25 MHz-wide resonance of the FFP cavity using the Pound-Drever-Hall method. The correction signal was used as the audio output and was preamplified and sampled at up to 96 kHz. The pickup system is largely immune against optical noise sources, exhibits a flat frequency response from the infrasound region to about 25 kHz, and has a distortion-free audio output range of about 50 dB.
一种基于光纤法布里-珀罗（FFP）腔的低噪声换能器被用作原声吉他的拾音器。采用庞德-德雷弗-霍尔方法将分布反馈（DFB）激光器锁定到FFP腔25 MHz宽的共振频率上。校正信号用作音频输出，并进行预放大，采样频率高达96 kHz。该拾音系统在很大程度上不受光学噪声源的影响，在次声区域到约25 kHz范围内呈现平坦的频率响应，并且具有约50 dB的无失真音频输出范围。
