Applications Engineering Notes

Transcription

1 Applications Engineering Notes Document Title Document Number 24 Fiber MTP Brand Connector Installation Onto Multimode or Single-mode 3.0 mm and 3.6 mm Jacketed Round Cable With Stranded or Bundled Loose Fibers AEN-1410 Revision Number 1.0 Effective Date June 01, 2016

2 THE USE OF SAFETY GLASSES FOR EYE PROTECTION IS RECOMMENDED 1.0 Document Purpose This document describes the ribbonization, termination and housing assembly procedure for 24 fiber MTP brand fiber optic connectors onto multimode or single-mode millimeter and millimeter jacketed round cable containing stranded or bundled loose fibers. 2.0 Required Equipment and Materials ½ Masking Tape 150 millimeter ruler or other measuring device Permanent marker IDEAL Coaxial Cable Stripper # Fiber Optic Side Cutters Scissors Copper Cable Jacket Stripper (CLAUSS P/N WS-5, JENSEN P/N 45B080, etc.) US Conec bare ribbon/3.0mm/3.6 mm jacketed round cable holder (P/N 13923) Thermal ribbon matrix stripper US Conec fiber ribbon cleaver (P/N MFA-004), US Conec high precision fiber ribbon cleaver (P/N 13969), or other fiber cleaving device Isopropyl alcohol and lint free wipes Centrifuge or other outgassing device Epoxy Technologies 353 N/D epoxy bi-pak 3 cc syringe with a barrel tipped cap installed #25PPS.014 x.50 plastic needle tip 2

3 Vacuum pump with MT nozzle (MT nozzle P/N ) Horizontal MT Ferrule Heat Curing Oven US Conec scribing tool (P/N ) 3.0 mm round MTP brand crimp tool and die set (P/N 8202) 3.6 mm round MTP brand crimp tool and die set (P/N 12345) OPTIPOP optical connector cleaner (Male P/N 6226, Female P/N 6227) 3.0 Cable Preparation 3.1 Slide the round cable MTP brand hardware onto the cable in the following order: 1) MTP brand round cable boot 2) MTP brand round cable crimp band 3) MTP brand High Fiber Count (HFC) round cable crimp body/spring push See Table 1 for applicable hardware sizes and part numbers. DESCRIPTION CABLE DIAMETER PART NUMBER Round Cable Boot Round Cable Crimp Band Round Cable High Fiber Count Crimp Body/Spring Push 3.0 mm mm mm mm mm mm Table 1: US Conec Round Cable MTP Brand Connector Parts 3

4 Place a piece of ½ masking tape around the cable to prevent the parts from falling off Place a mark on the cable jacket 150 mm from the end. 3.3 Using the coaxial cable stripper, etch the jacket at the 150 mm mark. NOTE: The coaxial cable tool must first be set to the proper cutting depth before use. Follow the directions in the packaging and use a piece of applicable size round cable to adjust the blade. 3.3a 3.3b 4

5 3.4 For fiber bundles stranded with blue and orange string: Carefully separate and remove the jacket from the fibers and aramid yarn a 3.4.1b Tape the cable to the work surface Carefully separate the aramid yarn from the fibers. Care must be taken to not disturb the fiber bundles during this operation Separate the blue and orange strands into two fiber bundles. 5

6 Place a small piece of ½ masking tape around the each bundle. Place a B, a 1 or other designator mark on the tape of the blue bundle. Place an O, a 2 or other designator mark on the tape of the orange bundle. 4.0 Fiber Ribbonization 4.1 See US Conec Document # AEN-1408, Operating Instructions for the US Conec Loose Fiber Ribbonizing Tool or US Conec Document # AEN-1414, Operating Instructions for the US Conec Disposable Loose Fiber Ribbonizing Die" for complete instructions for loose fiber ribbonization. 4.2 For fiber bundles stranded with blue and orange string: Remove the tape from the blue bundle. Trim the blue strings as close to the cable as possible. Ribbonize the blue bundle. Place a B, a 1, or other designator mark on the ribbon Remove the tape from the orange bundle. Trim the orange strings as close to the cable as possible. Ribbonize the orange bundle. Place an O, a 2, or other designator mark on the ribbon. 6

7 Using fiber optic side-cutters ONLY, measure and trim the ribbons to 55 mm Using scissors, measure and trim the aramid yarn at approximately 7 mm a 4.2.4b 7

8 4.3 For fiber bundles separated by inner tubings: Find the sub-unit marked #1. Using the 1.0 mm slot of the copper cable jacket stripper, etch the sub-unit covering as close to the cable jacket as possible. Using your fingers (not the stripper), pull the sub-unit covering straight away from the cable jacket and remove it from the loose fibers. 1.0mm slot CAUTION: DO NOT strip the sub-unit covering from the fibers with the copper cable jacket stripper as damage may occur to the fibers Ribbonize the bundle. Place a 1, a B, or other designator mark on the ribbon Find the sub-unit marked #2. Using the 1.0 mm slot of the copper cable jacket stripper, etch the sub-unit covering as close to the cable jacket as possible. Using your fingers (not the stripper), pull the sub-unit covering straight away from the cable jacket and remove it from the loose fibers. CAUTION: DO NOT strip the sub-unit covering from the fibers with the copper cable jacket stripper as damage may occur to the fibers Ribbonize the bundle. Place a 2, an O, or other designator mark on the ribbon. 8

9 Using fiber optic side-cutters ONLY, measure and trim the ribbon to 55 mm Using scissors, measure and trim the aramid yarn at approximately 7 mm a 4.3.6b 9

10 5.0 Fiber Ribbon Preparation Adjustable Rear Cover Front Cover Ribbon Opening Cable Slot Ribbon Tray Cable Stop Round Cable Holder P/N Position the cable into the round cable holder (P/N 13923) with the end of the jacket even with the cable stop. Close the adjustable rear cover to secure the cable in place. The cover will snap into place indicating the cable is secure in position. 5.1a 5.1b 10

11 NOTE: When using the tape ribbonization method the cable must be positioned into the round cable holder with the tape side of the ribbons facing upward. 5.2 Pull the top ribbon to one side of the round cable holder and position it into the ribbon opening. Align the bottom ribbon into the ribbon tray (with the tape side of the ribbon facing up if using the tape ribbonization method) and close the front cover. The cover will snap into place indicating the ribbon is secure in position. 5.2a 5.2b NOTE: The cable MUST remain in the round cable holder completely through the fiber cleaving process. DO NOT remove the cable from the holder until fiber cleaving is complete. 5.3 Place the round cable holder into a thermal ribbon matrix stripper and remove the tape or Loctite 4861 Instant Adhesive and the fiber coatings. 11

12 5.3a 5.3b 5.3c 5.3d 5.4 Check for damaged or broken fibers. If any are found, cut the ribbons evenly with the cable jacket and return to step 3.2. Repeat the process completely from this point forward. 12

13 5.4a Proper Fiber Strip 5.4b Improper Fiber Strip 5.5 Set the slider on the bottom of the round cable holder to cleave the fibers at 12 millimeters. NOTE: Each detent position moves the sliding spacer 1mm mm Cleaving Position Place the ribbon holder into a fiber cleaving device and cut the fibers evenly at a length of 12 millimeters. Check for damaged or broken fibers. If any are found, cut the ribbons evenly with the cable jacket and return to step 3.2. Repeat the process completely from this point forward. 13

14 NOTE: Smooth, evenly cut fibers will aid insertion into the ferrule. 5.7 Reset the slider on the bottom of the round cable holder to the 10 millimeter cleaving position mm Cleaving Position Open ONLY the front cover of the round cable holder. Pull the cleaved ribbon to the opposite side of the holder and position it into the ribbon opening. 5.9 Align the top ribbon into the ribbon tray (with the tape side of the ribbon facing up if using the tape ribbonization method) and close the front cover. The cover will snap into place indicating the ribbon is secure in position. 14

15 5.9a 5.9b 5.10 Repeat steps 5.3 and 5.4 for the top ribbon. CAUTION: Take care to not break the stripped fibers on the top ribbon while working with the bottom ribbon Place the ribbon holder into a fiber cleaving device and cut the fibers evenly at a length of 10 millimeters. Check for damaged or broken fibers. If any are found, cut the ribbons even with the cable jacket and return to step 3.2. Repeat the process completely from this point forward Remove the cable from the ribbon holder. The length of unstripped ribbon extending from the jacket should be 30 (+0/-1) millimeters Install a High Fiber Count (HFC) oval spring and a 24 fiber rubber ferrule boot (P/N 16359) onto the ribbons with the arrow pointing towards the bare fibers. Take care not to break the bare fibers. See Table 2 for applicable spring forces and part numbers. 15

16 DESCRIPTION PART NUMBER 10 Newton High Fiber Count Spring Newton High Fiber Count Spring Table 2: US Conec High Fiber Count (HFC) Springs 5.13a 5.13b 5.14 Carefully clean the bare fibers with lint-free wipes and isopropyl alcohol to remove any remaining coating residue and other contaminants. NOTE: NOTE: Take care not to pull the boot and spring off of the fibers while cleaning. If using the tape ribbonizing method, do not allow isopropyl alcohol to penetrate the tape of the ribbons. Doing so will cause the tape to lose adhesive properties, releasing the fibers. 6.0 Epoxy Preparation US Conec recommends use of EPO-TEK 353ND epoxy for all MTP brand connector products. However, different cure schedules are required for multimode and single-mode products. 16

17 See Table 3 for US Conec recommended cure schedules. FIBER TYPE CURE TEMPERATURE CURE TIME (minimum) All Multimode Products 85 C (±5 C) 55 Minutes All Single-mode Products 100 C (±5 C) 20 Minutes Table 3: US Conec Recommended EPO-TEC 353ND Epoxy Cure Schedules 6.1 Obtain an EPO-TEK 353ND epoxy bi-pak. 6.2 Slide the plastic clamp (divider) off of the epoxy bi-pak. Mix thoroughly for approximately 2 minutes until the epoxy has a consistent color throughout. 6.2a 6.2b 6.3 Put the mixed epoxy into a 3 cc syringe with a barrel tipped cap installed. Place the syringe into the centrifuge (or other outgassing device) and spin (outgas) for five (5) minutes. 17

18 6.3a 6.3b NOTICE: Failure to outgas will result in air being trapped in the epoxy. During curing, the air will expand, causing voids which will reduce the adhesive properties of the epoxy. This in turn may result in fiber pistoning, which will adversely affect the optical performance of the connector. 6.4 Remove the syringe from the centrifuge and install the plunger into the syringe approximately ½ inch. Invert the syringe and allow the epoxy to thoroughly settle against the plunger. 6.5 Remove the barrel tipped cap from the syringe and replace with a #25PPS.014 x.50 plastic needle tip. Compress the plunger until all air has been removed from the syringe

19 7.0 Ferrule Installation 7.1 Obtain a 24-fiber ferrule for the fiber type you are working with and locate the M (multimode), S (single-mode) or E (single-mode MT Elite ) identifier mark located on the ferrule shoulder in the lower right-hand corner below the window. The fiber count is visible on the back shoulder. NOTE: Multimode MT Elite ferrules have an M on the window side and an ME on the back shoulder. Identifier Mark Fiber Count 7.1 See Table 4 for applicable 24-fiber ferrule part numbers. 19

20 FERRULE TYPE PART NUMBER MARKINGS Front Side MARKINGS Back Side Standard Multimode 7412 M M24 Multimode Elite M ME24 Standard Single-mode, Pre-Angled, 10 Newton Single-mode Elite, Pre-Angled, 10 Newton Standard Single-mode, Pre-Angled, 20 Newton Single-mode Elite, Pre-Angled, 20 Newton S S E E S S E E 24 2 Table 4: US Conec 24-fiber MT Ferrules 7.2 Turn on the vacuum pump with the MT nozzle (P/N ) installed. 7.3 Apply epoxy through the front edge of the ferrule window along the fiber u- grooves. Ensure all fiber grooves are covered. 7.3a 7.3b 20

21 7.4 Place approximately 2 ( 1) millimeters of the ferrule, endface first, into the suction nozzle. Continue for approximately 5 seconds or until epoxy has filled all the fiber holes. 7.4a 7.4b After removal from the nozzle, an epoxy bead should be visible on the ferrule endface covering the fiber holes and should remain there through fiber insertion. NOTICE: CAUTION: Failure to perform the previous step or performing it improperly could yield an inconsistent epoxy bond between the fibers and ferrule material. This may cause fiber pistoning, which will adversely affect the optical performance of the connector. Keep the guide pin holes free of epoxy. Epoxy in the guide pin holes will prevent connector mating. 7.5 With the #1 (dark blue) fibers aligned with the M, S, or E identifier mark located on the ferrule shoulder in the lower right-hand corner below the window, insert the fibers into the opening in the rear of the ferrule Watch through the ferrule window and align the fibers of the bottom ribbon above the guide grooves of the bottom shelf. Tilt the ribbons slightly to allow the fibers of the bottom ribbon to settle into the guide grooves of the bottom shelf. This may be aided by gently moving the fibers within the ferrule window. 21

22 7.5.2 Slowly push the fibers along the guide grooves until the fibers of the top ribbon are over the top shelf. Tilt the ribbons slightly to allow the fibers of the top ribbon to settle into the guide grooves of the top shelf. This may be aided by gently moving the fibers within the ferrule window Slowly push the fibers along the guide grooves and insert them into the fiber holes in the ferrule. The fibers should slide smoothly into the holes and pass through the ferrule end face; however, if any resistance is felt, back out slightly and try again, watching through the window to ensure all fibers are in the proper groove. Any bending of a fiber signifies misalignment and will cause fiber breakage Push the fibers through the ferrule until 0.5 to 1.0 millimeter of fiber coatings are visible in the window. Do not push the fiber coatings beyond the step marking the end of the guide grooves. CAUTION: Pushing the edge of the fiber coatings beyond the guide grooves may cause the fibers to break inside the ferrule. 7.6 Carefully slide the ferrule boot into the opening in the rear of the ferrule until it stops. When in proper position, the edge of the boot will be visible in the lower edge of the window

23 8.0 Ferrule Curing 8.1 Apply epoxy into the window until the cavity is full and even with the top of the ferrule. Take care that no air pockets are formed inside the ferrule cavity. NOTICE: Care should be taken not to overfill the cavity as excess epoxy must be removed after curing. See US Conec Document # AEN-1904, US Conec Recommended MT Ferrule Epoxy Well Levels for more information. 8.2 Place the ferrules with the window up into the ports of the horizontal curing oven. Secure the cables under the clamp for that port. Once all connectors to be cured are placed in the oven, close the curing oven lid NOTE: Recheck epoxy level after five (5) minutes 8.3 Set the oven to the cure schedule for the type of ferrule being cured (multimode or single-mode). See Table 3 on page 17 of this document for US Conec recommended cure schedules. 8.4 After the cure time has elapsed, open the lid and remove the cured connectors from the curing oven. Allow to cool for ten (10) minutes. 23

24 8.5 Scribe each row of fibers along the epoxy bead. See US Conec Document # AEN-1906, US Conec Recommended Diamond Scribe Usage Procedure for more information on fiber scribing. 8.5a 8.5b 8.6 Grasp the fibers between the thumb and forefinger and gently pull the fibers straight away from the ferrule endface. 8.6a 8.6b 24

25 9.0 Ferrule Polishing For ferrule polishing please refer to the polishing equipment manufacturers guide for recommended processes or contact US Conec for more information. See US Conec Document # AEN-1512, US Conec Recommended Between-Step Cleaning Procedure for Flocked Cloth Polishing of MT Ferrules for more information on ferrule cleaning during and after polishing MTP Housing Assembly High Fiber Count MTP brand connectors may be assembled as either males or females. HFC male connectors have a metal pin clamp with guide pins pre-installed. HFC standard multimode pin clamps have no punch-outs. HFC Multimode Elite and HFC standard single-mode pin clamps have one punch-out. HFC Single-mode Elite pin clamps have two punch-outs. Female connectors have a plastic pin clamp spacer with guide pin stubs. Follow the instructions for the type connector (male or female) you are assembling. See Table 5 for female pin spacer and applicable pin clamp part numbers. DESCRIPTION PART NUMBER HFC Female Pin Spacer HFC Standard Multimode MTP, Lead Free HFC Multimode MTP Elite and Standard Single-mode MTP, Lead Free HFC Single-mode MTP Elite, Lead Free Table 5: US Conec High Fiber Count (HFC) Pin Clamps 25

26 10.1 Male Connectors: Obtain the required male pin clamp assembly and position it on the ribbon a b Insert the guide pins into the holes in the rear of the ferrule. Push the clamp over the ferrule boot and securely against the rear of the ferrule. It is important for the pin clamp to seat securely against the ferrule in order for the housing to assemble properly Slide the spring against the clamp. 26

27 10.2 Female Connectors: Obtain a HFC female pin spacer and position it on the ribbon a b Insert the guide pin stubs into the holes in the rear of the ferrule. Push the clamp over the ferrule boot and securely against the rear of the ferrule. It is important for the pin clamp to seat securely against the ferrule in order for the housing to assemble properly Slide the spring against the clamp. 27

28 10.3 Housing Installation See Table 6 for applicable housing colors and part numbers. APPLICATION PART NUMBER HOUSING COLOR 62.5µ Multimode (OM1) Standard 50µ Multimode (OM2) MTP-A12-11 MTP-A12-02 Beige Black Laser-Optimized 50µ Multimode (OM3) 7871 Aqua 7871 Aqua Laser-Optimized 50µ Multimode (OM4) Heather Violet Magenta Munsell Violet Standard Single-mode 8 Angled MTP-A12-12 Green Single-mode MTP Elite 8 Angled MTP-A12-15 Mustard Table 6: US Conec MTP Brand Connector Housings Slide the ferrule into the outer housing, making sure the dot on the housing and the identifier mark on the ferrule are aligned. Push the ferrule through the outer housing until it stops with the end face protruding from the housing. 28

29 Slide the spring push against the rear of the housing. Gently insert into the housing until the initial resistance is overcome and the spring push is inserted into the housing approximately one-quarter of the way In order to prevent breaking fibers, gently pull the cable as it exits the crimp body until it has removed the slack from the fibers Carefully work the spring push further into the housing until approximately one-half of it is inserted. Gently pull the cable as it exits the crimp body until it has removed the slack from the fibers

30 While holding the crimp body (knurled) portion of the spring push/crimp body, gently pull the cable straight back from the crimp body until the ferrule moves freely up and down within the housing. NOTE: If the ferrule does not move freely within the housing, remove the spring push/crimp body from the housing and inspect the jacket and strength members to insure they are not binding within the housing. Repeat steps through Continue working the spring push into the housing and pulling the cable as it exits the crimp body until the jacket is free of the crimp body. Continue gently pushing the spring push into the housing until a click is heard Connector Crimping Carefully pull the aramid yarn from the under the crimp body. EXTREME CARE MUST BE TAKEN TO NOT BREAK FIBERS! 30

31 Gently pull the aramid yarn to remove any slack. Evenly distribute the yarn around the circumference of the crimp body. If necessary, trim the yarn even with the back of the crimp body/housing assembly Pull the crimp band over the crimp body until it seats securely against the back of the crimp body/housing assembly, capturing the aramid yarn between the crimp body and crimp band. NOTE: No jacket should be captured between the crimp body and crimp band

32 Gently pull the crimp band and jacket in opposite directions to remove any slack that may be in the fibers, aramid yarn, or jacket. CAUTION: Make sure the jacket is NOT pulled from under the back end of the crimp band Crimp the crimp band to the crimp body Place the connector into the cavity of the round MTP crimp tool and die set for the cable size being terminated. Ensure the crimp band does not slide out of position. Squeeze the handles of the crimp tool together until a click is heard. Release the handles and remove the crimped connector. See Table 7 for applicable crimp tool and die sets. DESCRIPTION PART NUMBER 3.0mm Crimp Tool & Die set mm Crimp Tool & Die Set Table 7: US Conec Crimp Tool & Die Sets a b 32

33 c NOTE: The jacket will now be captured underneath the back end of crimp band Connector Completion Slide the boot over the crimp band until it seats completely against the back of the crimp body/housing assembly Clean the ferrule endface with the OPTIPOP optical connector cleaner. 33

34 Install the protective cap over the endface of the completed connector. 34