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 - 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 and record the power (in dBm) at the meter (Pl) (see figure 6El-5).

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

NOTE:        For single mode fiber FOCT end-to-end attenuation measurements, the reference MQJ may include a single loop with a diameter of 30 mm (l in) to eliminate higher order mode power.

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 6El-5.  Connecting the reference MQJ.

Step 2 - 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 6El-III, and connect the optical fiber cable under test to the light source and the power meter as

shown in figure 6El-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 FOCT links with single terminus connectors, the reference MQJ

shall be used as MQJl.

NOTE:    For FOCT links under test terminated with M83522 or COTS ST

connectors, an ST to ST adapter is required to connect the MQJs to the

FOCT link under test.  For FOCT links under test terminated with COTS

SC or other COTS fiber optic connectors, a hybrid adapter is required

to connect the MQJs to the FOCT link under test.

6El-5

METHOD 6El