Li S Y, Ngo N Q, Tjin S C, Shum P, Zhang J
Photonics Research Center, School of Electrical & Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.
Opt Lett. 2004 Jan 1;29(1):29-31. doi: 10.1364/ol.29.000029.
We propose a new method for the development of a tunable optical bandpass filter (TOBF) based on a linearly chirped fiber Bragg grating (LCFBG). A NiCr wire heater is used to heat the LCFBG at a small point to introduce a narrow passband within the stop band of the LCFBG. The central wavelength of the passband is tuned by scanning the wire heater along the LCFBG. As an example demonstrating the effectiveness of the proposed method, we demonstrate a TOBF with a very small 3-dB bandwidth of approximately 7 pm, a tuning range of 16.4 nm, and a rejection ratio of more than 25 dB. Compared with previously reported tunable-fiber-based bandpass filters, this method provides the advantages of a large tuning range, continuous tunability, a switchable passband, a simple tuning mechanism, low cost, and narrow bandwidth.
我们提出了一种基于线性啁啾光纤布拉格光栅（LCFBG）开发可调谐光学带通滤波器（TOBF）的新方法。使用镍铬合金丝加热器在一个小点处加热LCFBG，以在LCFBG的阻带内引入一个窄通带。通过沿LCFBG扫描丝加热器来调谐通带的中心波长。作为证明所提方法有效性的一个例子，我们展示了一个TOBF，其具有约7 pm的非常小的3 dB带宽、16.4 nm的调谐范围以及超过25 dB的抑制比。与先前报道的基于光纤的可调谐带通滤波器相比，该方法具有调谐范围大、连续可调性、可切换通带、调谐机制简单、成本低和带宽窄等优点。
