15 1 111 Super Low-Loss / Super High-Density Multi-fiber Optical Connector * * * *2 Katsuki Suematsu Masao Shinoda Takashi Shigenaga Jun Yamakawa *2 *3 *3 Masayoshi Tsukamoto Yoshimi Ono Takayuki Ando 8.15 dbsmf2.3 dbsmf 6 1. MPOMPX TM MT24 8 MPO 4 2. 2.1 MT MT 8 2432 6.15 db8.35 db24 1. db326 MT 1 MT MT 2.5 mm6.4 mm 6.4mm 2.5mm 4.6mm MT24 Ferrule 1 MPO MPO connector 2 MPX TM MPX TM connector MT8 Ferrule * *2 *3 LIGHTRAY MPX TM MT32 Ferrule 1 MT End-face of MT ferrule MT6 Ferrule
WDM SMF 8 PC 3 24MT MT24 connector 4 32MT MT32 connector 3. 8MT L L 4.34R/w 2 [db] 5 5 6MT MT6 connector.25 mm2.5 mm 122 32 6.25 mm 8 4 125 MPOMPX TM MT MT SM 2.2 MPO MPO 2 MPO JIS C 5982 F13 1 MT MT2 R[µm]w[µm] R 1 3E1 2 3E2 3 3E3 4 4E4 5 5E5 E1E2E3 V E5 2 MT 6 Y Y offset E1/2E4E5 End face of MT ferrule Y alignment hole X alignment pen E1 fiber hole Y fiber hole optical fiber E2 E3 X design position of fiber hole E1: clearance between alignment pin and alignment hole E2: clearance between fiber hole and fiber E3: fiber holle position error 2 MPO Structure of MPO connector 3 Causes of position error of fiber core 51
15 1 111 fiber tilt: θ ( ) E4 7 2 MT Fiber hole tilt (2D-MT ferrule) direction of alignment hole 4 Fiber hole tilt polishing volume End face of MT ferrule window 8 Parallel arrangement of fiber and alignment holes adhesive resin E5 5 Bend by curing adhesive resin spring pressure spring pressure position error of center E1/2 6 Position error by slipping 9 Structure of high-precision metal mold Y 1 8MT 24 4 7 8 8 7 4. 4.1 9 2 24MT 52
WDM 4.2 2 1 1 MT 11 4.3 3 V V 3 2 V 12 V 1 µm 328 4 612 5 5. 13 12 3 6. 6.1 8MPO 8.4 µm MPO 14 1 Structure of conventional pins 12 Metal mold for super high-density ferrule pre-heated resin plunger Molded product (1) Charging molding material (2) Pressing (3) Mold opening, take-out of product 11 Structure of improved pins 13 Transfer mold process 53
15 1 111 SMF, λ =1,31nm Angle Polished, Without index gel 6 SMF, λ =1,31nm Flat polishing, With index gel 3 1 Super Low-loss Ave..66dB Max..15dB Std..3dB N 528 Low-loss Ave..17dB Max..35dB Std..62dB N 528 3 1 Ave..31dB Max..76dB N 192..1.2.3.4.5.6.7..1.2.3.4.5.6.7.8.9 1. 14 8MPO Insertion loss of super low-loss MPO8 connector 17 32 Insertion loss of super high-density 32-fiber connector End-face of ferrule Ave..45µm Max..95µm N 144 16 1 1 MMF, λ =1,31nm Flat polishing, With index gel Ave..8dB Max..4dB N 18 3 Inside of ferrule Polishing value µm Ave..55µm Max. 1.28µm N 144 1 8 6 1..2.4.6.8 1. 1.2 1.4 1.6 1.8 2. Fiber hole position error (µm)..1.2.3.4.5.6.7.8.9.1 15 24MT Fiber hole position error of low-loss MT24 ferrule 18 6 Insertion loss of super high-density 6-fiber connector 16 8 7 6 3 1 SMF, λ =1,31nm Angle polishing, Without index gel..1.2.3.4.5.6.7.8.9 1. Standard polish Polishing value 1µm Ave..8dB Max..25dB N 96 Inside of ferrule Polishing value µm Ave..9dB Max..3dB N 96 24MPO Insertion loss of low-loss MPO24 connector.35 db.15 db 6.2 24MPO 24 E3E4 15 µm 1 µm 1.3 µm MPO 16.3 db 1 µm µm 6.3 326 8 432 125 6 17 32 SMF SMF.8 db 18 6 MMF MMF.1 db 54
WDM 1 Test Thermal aging Humidity Temperature cycling Vibration Twist Straight pull Side pull Impact Durability 8 24MPO Result of reliability test (MPO8, MPO24 connector) Duration 14 days 14 days 42 cycles (14 days) Test parameter 85 C 95 % at 6 C - C to 75 C Insertion loss variation <.1 db <.3 db <.3 db 2 hours/axis for 3 axis 8 cycles cycles 1 to 55 Hz 2.2 N 2.2 N 2.2 N 1.5 m drop Connect and disconnect <.2 db <.1 db <.1 db <.2 db <.1 db <.3 db 1 Nagasawa, Yokoyama, Ashiya, and Satake, "A High-Performance Single-Mode Multifiber Connector Using Oblique and Direct Contact Between Multiple Fibers Arranged in Plastic Ferrule", IEEE Photon. Techno. Lett., Vol.3, No.1, pp.937-939, 1991. 2 Shimoji, " MPO Optical Backplane Connector", IEICE Trans. Commun., Vol.E-8B, No.4, pp.535-539, 1997. 3 Suematsu, Shimoji, Iijima, and Hirao, Development of Two- Dimensional Array 24-Fiber MPO Connector", Euro Cable, IOS Press, AKM, pp.278-285,. 4 Tsukamoto, Hirao, Yamakawa, and Kamiko, "Low-loss MPO Connector", IWCS Proceedings of th, pp.379-383, 1. 5 JIS C5962, p.19 6 Suematsu, Shinoda, and Ono, "Development of MT ferrule for Low-Loss 24MPO Connector", IWCS Proceedings of 51st, 2. 6-FC connectors MT 6 connector 6 6MT- MT6 Fan-out 6.4 1 SMF MPO 8MPO 24MPO Telcordia GR-1435- CORE 7. 8 24MPO 326 6 Fan-Out 55