Calibrating device for large-range continuous optical path delay line
A technology of calibration device and delay line, applied in the field of calibration device of large-range continuous optical path delay line, can solve the problems of low precision, small delay range, large delay line connection loss, etc., and achieve high-precision measurement, high measurement accuracy, The effect of a large scanning range
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[0062] Example 1: Reflective calibration device for long-range continuous optical path delay line
[0063] The selection and parameters of the main optoelectronic devices are as follows:
[0064] (1) The center wavelength of the broad-spectrum light source 101 is 1550nm, the half-spectrum width>45nm, and the fiber output power>2mW;
[0065] (2) The working wavelength of the 2×2 coupler 103 is 1550nm, and the splitting ratio is 50:50;
[0066] (3) The working wavelength of the ring cavity 111 is 1550nm, and the insertion loss is ≤0.5dB;
[0067] (4) The working wavelength of 1×8 optical switch 131 is 1550nm, and the insertion loss is ≤0.8dB;
[0068] (5) The extension fiber is G.652 ordinary fiber 132, and the model is SMF28e;
[0069] (6) The working wavelength of the optical collimator 141 is 1550nm, and the scanning distance between it and the movable optical mirror 143 (reflectivity above 95%) is about 0~200mm, and the average insertion loss is 3.0dB;
[0070] (7) The center wavelength...
Example Embodiment
[0087] Example 2: Calibration device for transmission type long-range continuous optical path delay line
[0088] A transmission type long-range continuous optical path delay line calibration device such as Figure 5 As shown, compared with Example 1, most of the optoelectronic device parameters are exactly the same. The difference is that in Example 2, the continuous optical path scanning device uses a set of optical collimators, a set of optical mirrors and a programmable displacement The length of the periodic retarder has changed.
[0089] In such Figure 5 In the structure shown, a 1×8 optical switch is also used to form an 8-channel optical fiber delay line, and 8 discrete delays can be obtained. Such as Image 6 The measurement process of the delay amount of the optical fiber delay line is shown as follows:
[0090] (1) Turn on the instrument, reset the optical switch, and reset the programmable stage;
[0091] (2) Select the delay light path M for the programmable stage 0 ; ...
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