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    • 84. 发明申请
    • DEVICE FOR MEASUREMENT OF OPTICAL WAVELENGTHS
    • 用于测量光波长的装置
    • WO98036252A1
    • 1998-08-20
    • PCT/NO1998/000031
    • 1998-01-29
    • G01J3/32G01J3/28G01J9/02G01J3/42
    • G01J9/0246
    • A device for accurate and repeatable measurements of optical wavelengths, including an interrogation broadband light source (1) and a tuneable optical filter (2). A first part of the light is, in either order, transmitted through the filter (2) and reflected from, or transmitted through, at least one fibre Bragg grating (5) with known Bragg wavelength, providing an absolute wavelength reference, and directed to a first detector (7). A second part of the light is, in either order, transmitted through the filter and transmitted through, or reflected from a Fabry-Perot filter (8) with fixed and known free spectral range, creating a comb spectrum sampling the interrogation source spectrum to provide an accurate frequency/wavelength scale. Said second part of the light is directed to a second detector (10), where the electrical output signals from the detectors (7, 10) are simultaneously sampled, compared and processed in a signal processing unit (11) to provide accurate and repeatable wavelength measurements.
    • 一种用于光学波长的精确和可重复测量的设备,包括询问宽带光源(1)和可调谐光学滤波器(2)。 光的第一部分以任何顺序通过滤光器(2)透射并通过具有已知布拉格波长的至少一个光纤布拉格光栅(5)反射或透射通过,提供绝对波长参考,并指向 第一检测器(7)。 光的第二部分以任一顺序通过滤波器传输并通过固定和已知的自由光谱范围传输通过法布里 - 珀罗滤波器(8)或从Fabry-Perot滤波器(8)反射,从而产生梳状频谱采样询问源频谱,以提供 精确的频率/波长标度。 所述光的所述第二部分被引导到第二检测器(10),其中来自检测器(7,10)的电输出信号被同时采样,在信号处理单元(11)中进行比较和处理,以提供精确和可重复的波长 测量。