[0032] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the specific embodiments of the present invention will be described clearly and completely below.
[0033] figure 1 It is a schematic structural principle diagram of a detection device for the isolation of the filter 12 and the input light loss index provided by an embodiment of the present invention. Such as figure 1 As shown, the detection device includes a base 1, a vertical plate installed on the base 1 and perpendicular to the base 1, a Z-axis displacement platform 3 installed on the vertical plate 2, and a photodetector installed on the Z-axis displacement platform 3. 4. The filter placement platform installed on the vertical plate 2 and under the Z-axis displacement platform 3, 5, the XY-axis displacement platform installed on the base 1, and the XY-axis displacement platform 6 for fixing the collimator 8 The supporting column 7, the light source 9 connected with the collimator 8 through optical fibers, the current measuring module 10 electrically connected with the photodetector 4, the collimator 8 and the controller 11 arranged under the filter placement platform 5. The controller 11 is respectively connected to the current measurement module 10 and the light source 9. The current measurement module 10 measures the output current of the photodetector 4 and sends the measured current value to the controller 11, and the controller 11 receives the current measurement module 10 In addition, the controller 11 also controls the wavelength of the optical signal sent by the light source 9. In addition, the controller 11 is also used to calculate the isolation value of the filter 12 and the input light loss index value: when the light source 9 emits light When the wavelength of the signal is the same as the wavelength of the light reflected by the filter 12, the controller 11 receives the current value measured by the current measurement module 10 and calculates the isolation of the filter 12 based on the current value and the maximum current value measured when the filter 12 is not placed When the wavelength of the light source 9 emitted light signal is the same as the wavelength of the light transmitted by the filter 12, the controller 11 receives the current value measured by the current measurement module 10 and based on the current value and the maximum value measured when the filter 12 is not placed The current value calculates the input light loss value of the filter 12. The collimator 8 is used to avoid the influence of the focal length on the test result. Specifically, the collimator 8 is perpendicular to the filter placement platform 5, and the filter 12 is placed flat on the filter placement platform 5. It needs to be explained that the filter placement platform 5 itself should not affect the transmission of optical signals.
[0034] Specifically, in this embodiment, the light source 9 is a laser light source, the photodetector 4 is a large photosensitive area detector, and the current measurement module 10 is a 2400 digital source meter.
[0035] For the detection method of the isolation degree of the filter and the input light loss index using the above-mentioned embodiment, refer to the following specific method embodiment.
[0036] Another embodiment of the present invention is a method for detecting the isolation of the filter and the input light loss index, which includes the isolation detection of the filter and the detection of the input light loss index. It needs to be explained that the isolation detection of the filter and the input The detection of the optical loss index is two independent measurement steps, which do not affect each other. Therefore, the isolation detection method of a separate filter or the detection method of the input optical loss index also belongs to the protection scope of the present invention.
[0037] 1. Isolation detection of filter
[0038] The isolation detection of the filter includes:
[0039] (1) The controller controls the light source to emit laser light, where the wavelength of the laser light is the same as the wavelength reflected by the filter.
[0040] (2) The laser light emitted by the light source is transmitted to the collimator through the optical fiber, and the collimator converts the received convergent light into parallel light and transmits it directly to the photodetector. At this time, do not place the filter to be measured on the filter placement platform, so that the photodetector directly receives the laser light sent by the collimator.
[0041] (3) The current measurement module measures the output current of the photodetector and sends the measured current value to the controller, adjusts the XY axis displacement platform, and moves the collimator until the current value measured by the current measurement module is the largest. It needs explanation In order to measure the maximum current value, the XY-axis displacement platform can be moved according to a certain step value. Record the maximum current value measured as I max.
[0042] (4) Place the filter to be measured on the filter placement platform, and the collimator converts the received convergent light into parallel light and transmits it to the filter.
[0043] (5) The laser light passes through the filter and is received by the photodetector. The current measurement module measures the output current of the photodetector and sends the measured current value to the controller.
[0044] (6) The controller receives the current value I measured by the current measurement module and based on the current value I and the maximum current value I measured when the filter is not placed max Calculate the isolation value A of the filter, the specific calculation formula is: A=10*log(I max /I).
[0045] 2. Detection of input optical loss indicators
[0046] The detection of input optical loss indicators includes:
[0047] (1) The controller controls the light source to emit laser light, where the wavelength of the laser light is the same as the wavelength of the light transmitted by the filter.
[0048] (2) The laser light emitted by the light source is transmitted to the collimator through the optical fiber, and the collimator converts the received convergent light into parallel light and transmits it directly to the photodetector. At this time, do not place the filter to be measured on the filter placement platform, so that the photodetector directly receives the laser light sent by the collimator.
[0049] (3) The current measurement module measures the output current of the photodetector and sends the measured current value to the controller, adjusts the XY axis displacement platform, and moves the collimator until the current value measured by the current measurement module is the largest. Record the maximum current value measured at this time as I max2.
[0050] (4) Place the filter to be measured on the filter placement platform, and the collimator converts the received convergent light into parallel light and transmits it to the filter.
[0051] (5) The laser light passes through the filter and is received by the photodetector. The current measurement module measures the output current of the photodetector and sends the measured current value to the controller.
[0052] (6) The controller receives the current value I measured by the current measurement module 2 And according to the current value I 2 And the maximum current value I measured when the filter is not placed max2 Calculate the input optical loss value B of the filter, the specific calculation formula is: B=10*log(I max2 /I 2 ).
[0053] It can be seen from the above embodiments that through the device and method in the embodiments of the present invention, the isolation of the filter and the test of the input optical loss index are realized. Compared with the prior art, the test time is significantly reduced and the investment cost is reduced. It is easy to achieve batch testing.
[0054] It should be noted that the above-described embodiments are a part of the embodiments of the present invention, rather than all of the embodiments, and do not limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
