LC Connector Installation - Fosco Connect
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LC Connector Installation – Fosco Connect

we offer quick and easy online ordering of all types of lc connectors

These are detailed epoxy lc connector assembly and termination instructions for singlemode and multimode lc connectors.

Reading: How to connect lc fiber connector

The steps are quite generic and apply to most major brand lc connectors on the market, such as 3m, seiko, corning, molex, amp, etc.

here are the components of the lc connector before assembly.

LC connector components before assembly

here is the lc connector after assembly.

LC connector after assembly

step 1: set up the heat cure oven

a) Place the oven on a level surface and away from combustibles.

b) Plug the oven power cord into a power source and turn on the oven.

c) Warning: After the oven reaches its operating temperature, the oven ports will be extremely hot [266°F (130°C)].

Set Up the Heat Curing Oven

step 2: prepare the fiber

a) Remove the cable jacket and outer jacket. be careful not to cut the fibers while removing the cable jacket and outer jacket.

b) Be sure to expose enough buffered fiber to allow access to the curing oven and other connector preparation functions. typical working length for buffered fibers is 24 to 36 inches (0.6 to 0.9 meters).

c) Install the buffer support sleeve by sliding the small end of the sleeve onto the protected fiber.

slipping the small end of boot onto the buffered fiber

d) Measure and mark the buffered fiber 7/16 to 1/2 inch (11 to 13 mm) from the end using the scale or template provided in the tool kit.

Measure and mark the buffered fiber

e) Locate the 1026a heat strip tool (105 514 764) provided in the tool kit.

f) strip 7/16 to 1/2 inch (11 to 13 mm) of the buffered fiber.

Strip 7/16 to 1/2 inch (11 to 13 mm) of the buffered fiber

g) Clean the stripped fiber by saturating a wipe with isopropyl alcohol (>91% 2-propanol + water) and wiping the fiber from the edge of the buffer toward the end of the fiber.

h) Place the prepared buffer in the slots of the 971a-2 support block to avoid breaking or contaminating the fiber (support blocks are included in upgrade kit d-182959).

Place prepared buffer into the grooves of the 971A-2 holder block

step 3: prepare the epoxy

The supplied epoxy comes in a two-part package. a divider separates the resin from the hardener. the divider must be removed to allow the epoxy to mix. then the epoxy is loaded into a syringe.

a) remove the divider between the resin and hardener.

b) Mix the epoxy using the divider. the epoxy should be mixed thoroughly until both parts blend into a smooth, even color.

Mix the epoxy using the divider

c) Place the tip of the syringe on the syringe and twist it to lock it into place. remove the plunger from the syringe.

d) Fold the epoxy packet in half and cut off one of the corners of the packet. squeeze the mixed epoxy into the syringe. a ¾ inch (19 mm) length of epoxy will suffice for about 50 connectors.

Squeeze the mixed epoxy into the syringe

e) Put the plunger back on the syringe.

Remove air pockets from syringe by holding syringe tip up and expelling epoxy until air pockets are removed.

step 4: install the lc connector

a) prepare the connector.

Hold the connector up to the light and make sure the hole and tip are clear. if necessary, clean the hole with the music cable (included).

Locate a connector bracket with extension (107 852 493) from the upgrade kit. snap the connector into the bracket.

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Snap connector into the holder.

b) apply the epoxy

The epoxy is injected into two areas of the connector: (1) inside the ferrule and (2) on the back of the ferrule.

The syringe is first used to inject epoxy into the ferrule. this epoxy bonds the stripped fiber to the ferrule.

Before removing the syringe from the connector, epoxy should be deposited on the back of the ferrule. this epoxy bonds the cushion to the back of the ferrule.

do not apply an excessive amount of epoxy to the ferrule or to the back of the ferrule.

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epoxy must next be deposited at the back of the ferrule

1. locate the small tube inside the back of the connector.

2. Carefully insert the tip of the syringe into the small tube until it bottoms out. Caution: In the next step, do not apply excess epoxy to the tip of the ferrule.

3. Inject epoxy into the ferrule by slowly depressing the syringe plunger until the epoxy just appears at the tip of the connector (face of the ferrule).

4. Deposit epoxy on the back of the ferrule by pulling back slightly on the tip of the syringe and momentarily injecting a small amount of epoxy into the back of the ferrule.

5. release the pressure on the plunger, wait a moment, and then remove the syringe from the connector.

injecting a small amount of epoxy at the back of the ferrule

c) insert fiber

1. remove the prepared fiber from the support block.

2. insert the exposed fiber into the small tube inside the connector and carefully feel the opening in the ferrule.

3. when the fiber is seated, pull it back slightly and watch the movement of the fiber at the tip of the connector to make sure the fiber is not broken.

4. put the fiber back into the connector and lock the buffer into the slot at the end of the bracket extension.

5. make sure the buffer support boot is pushed back on the cable.

fiber back into the connector and lock buffer

6. place the tampon in the slot of the holder extension.

7. store up to 12 btw connectors on the 971a-2 support blocks.

12 BTW connectors in the 971A-2 holder blocks

d) curing connector assemblies

1. When the desired number of connectors have been prepared, place the support block next to the preheated oven.

2. place the prepared connector assemblies into the oven ports.

3. make sure the connector assemblies are seated in the bottom of the oven ports.

4. remove the assemblies from the oven after they have cured for 10 minutes.

e) cool connector assemblies and attach shock mount sleeve

1. place cured assemblies back on the support block to cool.

2. select a connector assembly and remove the fiber buffer from the bracket slot.

3. push the cable support sleeve onto the connector.

4. repeat steps 2 and 3 for each connector assembly.

f) mark the fiber

1. remove the connector from the connector bracket.

2. get the 975a cutting tool from the 1032b5 tool kit or the 1032b6 tool kit. in the next step, cut the fiber as close to the ferrule as possible while being careful not to break the fiber.

3. place the cutting tool against the ferrule and exposed fiber.

4. Using one stroke of the cutting tool, gently score the exposed fiber.

5. remove the exposed fiber by carefully pulling on the cable. if the fiber does not peel off easily, re-mark the fiber on the opposite side and pull the fiber carefully.

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6. dispose of leftover fiber safely.

Score the Fiber

g) polished fiber end for multimode and singlemode lc connectors

1. remove the fiber end

with one hand, hold one of the cut pieces of j-type polishing paper (dull side down)

on the other hand, hold the connector with the tip facing up. note: when doing the next step, be careful not to break the piece of fiber.

air polish in light circular motions approximately 1 inch in diameter; Carefully polish the piece of fiber.

Polish Fiber End

2. remove excess epoxy

Use compressed air to clean the back and front of a full piece of j-type polishing paper (purple).

Saturate a wipe with isopropyl alcohol (>91% 2-propanol + water).

Get a glass plate and polishing tool (t2000a or t2001a) from upgrade kit d-182959.

clean the glass plate and polishing tool with the soaked wipe.

Use compressed air to dry the glass plate and polishing tool.

insert the lc connector into the t2000a or t2001a polishing tool.

place a clear spacer sheet on the glass plate, then place a sheet of j-type polishing paper (purple) on the glass plate with the dull side facing up.

Gently place the polishing tool and connector on the polishing paper. note: in the next step, you should not feel any drag between the fiber and the paper.

Start with light pressure and use figure 8 strokes that are about 2 inches tall and 1 inch wide. the figure 8’s must be well rounded to ensure complete removal of the epoxy from the end of the ferrule.

Using light pressure, polish the connector in 20 figure-8 motions. Hazard: Optical fibers can emit radiation if the other end is connected to a working laser or light-emitting diode (LED). never look at the fiber end of a cable or plug with the naked eye or any optical instrument until absolute verification is established that the fiber is disconnected from any laser or led source.

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Using a 7x magnifying eyepiece or lc microscope supplied in upgrade kit d-182905 or d-182959, check the tip of the ferrule. no excess epoxy should surround the fiber. note: if excess epoxy is found, continue to use type j (purple) polishing paper to remove excess epoxy.

Remove excess epoxy

3. dome ferrule end

Place the following consumables on the glass plate: one white foam pad, five clear spacers, and place one sheet of f-type (yellow) polishing paper on top. note: type f polishing paper can be reused by cleaning it with alcohol and wipes.

Using light pressure, polish the connector in 20 figure-8 motions. Note: Step 3 concludes the polishing procedure for multimode fibers. Steps 4 and 5 should be done for singlemode fibers only.

4. singlemode lc connector only – improves dome surface finish

Replace the f-type (yellow) polishing paper sheet with a k-type (grey) sheet with the dull side facing up. leave the five clear spacers and the foam pad on the glass plate.

polish the connector with an additional 20 figure 8 passes.

5. singlemode lc connector only – polished finish

Remove all polishing material from the glass plate and replace with l-type felt polishing pad (purple). note: step 5b is critical for excellent return loss. act carefully guiding the polishing tool and cover slowly and gently, never increasing the pressure.

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moisten a quarter of the sheet with distilled water (do not flood). buff 20 smooth strokes into a figure 8, about 3 inches tall and 1 ½ inches wide.

wipe the end of the fiber with a water-moistened wipe, followed by a second alcohol-moistened wipe.

felt can be stored wet in a clean plastic bag and reused. the glass plate should be cleaned immediately with water and dried completely before storage to prevent polish residue from permanently drying on the glass plate.

Note: Step 5 provides the necessary steps for a high performance return loss. l-type felt polishing pad (purple) is embedded with ultra-fine polishing material.

Dome ferrule end

Epoxy LC Connector Polishing for Multimode and Single Mode

h) Repair polish only

1. place a sheet of f-type paper and a clear spacer on the glass plate.

2. using little or no pressure, polish the connector until the defect has been removed.

3. repeat step 3 in section 3.4.7. polishing note: do not over polish. about a third of the length of the chamfer can be polished. this concludes the repair procedure for multimode fibers.

4. For singlemode fibers only, repeat steps 4 and 5 in section 3.4.7.

i) final assembly

once polishing is complete and the final finish is acceptable, cover the end of the connector with a white dust cap.

finished LC connector assembly

Step 5: Inspect the fiber and ferrule end geometry

a) fiber inspection

1. moisten a wipe with isopropyl alcohol (>91% 2-propanol + water).

2. clean the end of the splint with the wet wipe and then with a dry wipe.

3. dry the splint with compressed air.

4. locate the supplied lc microscope in upgrade kit d-182905 or d-182959.

5. Insert the ferrule end of the connector into the microscope adapter (center hole). danger: a high intensity light can be used at the other end of the fiber to illuminate the core of the fiber.

6. open the microscope barrels to illuminate the tip of the connector and use the side wheel to focus.

inspect fiber endface

b) ferrule end geometry

The dimensions in the table below are for reference only and apply after all polishing procedures have been completed.

ferrule endface geometry

recommended single mode ferrule end geometry

recommended fiber undercut

step 6: lc adapter and connector cleaning instructions

a) cleaning the lc connector

1. moisten a wipe with isopropyl alcohol (>91% 2-propanol + water).

2. clean the end of the splint with the wet wipe.

3. dry the splint with compressed air. Caution: Signal performance will be affected if the connector tip is not thoroughly cleaned.

b) cleaning the lc adapter

1. If access to the adapter is only available from one side, use compressed air to blow out the inside of the adapter.

2. If access is available from both sides of the adapter, clean the adapter with an lc adapter brush moistened with alcohol followed by compressed air. the brush can be cleaned with alcohol and compressed air.

Caution 1: Do not attempt to clean the inner adapter sleeve with a standard pipe cleaner. the inner diameter of the sleeve is too small.

caution 2: do not try to clean the adapter with an lc adapter brush if there is a connector mounted on the adapter.

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