MIL-STD-2042-6B(SH)
4. GENERAL REQUIREMENTS
4.1 Test methods. The test methods identified in this standard practice shall be used to verify the proper operation and performance of the components that make
up the FOCT (see 3.11). These tests shall be performed during various phases of installation of the FOCT, as described in the following paragraphs.
4.1.1 Acceptance tests. Conventional optical fiber cable, BOF cable and associated components should undergo visual inspection and testing upon receipt at the shipyard. The conventional optical fiber cable should be tested while still on the shipping reel to ensure that it is mechanically, and optically sound.
Similarly, BOF cable should be tested while still on the shipping reel to ensure that it is mechanically sound. The associated fiber optic components should be subjected to visual examination only.
4.1.2 Pre-Installation tests. Visual inspection and testing of the conventional optical fiber cable and BOF cable should be conducted just prior to installation in the cableways to verify that the cables are still mechanically and optically sound.
4.1.3 Installation tests. After conventional optical fiber cable is installed in the cableways, the pre-installation tests should be repeated to verify that
fibers were not broken or damaged when the cable was pulled through the cableways. After BOF cable is installed in the cableways, the pre-installation tests should be repeated to verify that the cables were not damaged when the cable was pulled through the cableways. Additional testing shall be conducted after installation of connectors or splices to ensure that the optical losses induced by these components are within acceptable limits and that the continuity of each fiber between interconnection devices has been maintained.
4.1.4 Post-Installation tests. After all FOCT links have been installed, tests shall be conducted to verify that the end-to-end attenuation of the FOCT is within specified limits.
4.2 Test equipment. The following paragraphs discuss optical test equipment in general terms only. The specific equipment to be used for each test is identified in the individual test methods of section 5.
4.2.1 Optical time domain reflectometer (OTDR). The OTDR is used for:
a. Estimating the attenuation rate of a fiber;
b. Identifying the nature and location of defects in an optical link.
4.2.2 Optical power meter and stabilized light source. The optical power meter and stabilized light source (for example, portable light emitting diode (LED) or laser diode) are used together to make accurate optical transmission loss measurements. Measurement quality jumpers (MQJs) are used to couple light from the stabilized source to the optical link under test, and from the optical link under test to the power meter.
4.2.3 Optical loss test set (OLTS). The OLTS combines the optical power meter and stabilized light source (see 4.2.2) into a single item (in some cases the OLTS may still consist of two units). The OLTS may display the transmission loss
directly by comparing the optical power level of the source with the optical power level transmitted through the optical link under test.
4.2.4 Optical return loss meter (ORLM). The ORLM is used to measure the optical return loss of the optical fiber cable assembly or link. Test equipment for
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