MIL-STD-2042-6 Fiber Optic Cable Topology Installation Standard Methods For Naval Ships Tests Part 6 Of 7 PartsThis standard practice provides detailed methods for testing optical fiber cable installations.

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MIL-STD-2042-6B(SH)

Step l - Record the length of the optical fiber cable from the vendor's data or as measured.  If the optical fiber cable length is unknown a value of "0/unknown" may be recorded.

Step 2 - WARNING:  When visually inspecting an optical fiber, never stare into the end of a fiber connected to a laser source or LED.  Light may not be visible but can still damage the eye.

Connect the reference MQJ (NAVSEA DWG 6877804-l, NAVSEA DWG 6877804- lSM, or NAVSEA DWG 6877804-lSME) between the light source and the power meter.

NOTE:        For single mode optical fiber cable assembly loss measurements, the reference MQJ may include a single loop with a diameter of 30 mm (l in) to eliminate higher order mode power.

Step 3 - Measure and record the reference power (in dBm) at the meter

(designated as Pl) (see figure 6Cl-5).

NOTE:        The time delay between the measurement of Pl  and P2  shall be kept to a minimum to prevent inaccurate measurements.

NOTE:        The value obtained for the reference power, Pl, should be consistent from test to test.  Changes in the reference power greater than 0.5 dB indicate either a defective MQJ or a defective light source.  If changes in the reference power greater than 0.5 dB occur, clean or replace the MQJ and repeat Step 3.

Reference MQJ

ST

connectors

FIGURE 6Cl-5.  Reference measurement.

Step 4 - CAUTION:  Make sure that the keys are correctly aligned to the mating keyways before mating MQJs to MIL-C-28876 optical fiber cables. Incorrect keyway alignment will result in damage to the connector pins.

Select the applicable MQJs from table 6Cl-III, and connect the optical fiber cable under test to the light source and the power meter as

shown in figure 6Cl-6.  For optical fiber cable assemblies terminated in splice ferrules use Procedure I to assemble the optical fiber cable assembly splice ferrules to the MQJ splice ferrules.

NOTE:        For optical fiber cables with single terminus connectors, the reference MQJ shall be used as MQJl.

6Cl-5

METHOD 6Cl