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The change of field of view (FOV) which is caused by the image defocus of laser communication terminal introduced in the process of assembly will have a great interference to the link energy budget. In view of the problem, the method of measuring the FOV is proposed to calculate the defocus amount of receiving system. On the premise of the sensitivity of the detector is satisfied by the received energy, the relationship among the defocus receiving energy, defocus amount and FOV are derived by the theoretical analysis and calculation. With the link distance is 1km, the defocus amount of 0.27mm is calculated under the FOV of 0.965mrad which is measured by experimental test. The maximum FOV from 2km to 4km can be reversed further. At the same time, the test experiment platform was designed and the FOV of the laser communication terminal was measured. Compared with the theoretical calculation results, the maximum error is less than 55μrad, which is conformed to the error allowable range. Conclusion: By the method of measuring the FOV of the system, the defocus error which is caused by assembling can be calculated, so the maximum FOV of the system in different link distance can be simulated. The method not only solves the problem that the defocus amount is difficult to measure, but also provides theoretical guidance to increase the FOV of laser communication by introducing the image defocus.
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