Masaaki Takaya

Design and performance of very-high-density 60-fiber connectors

High-density, high-count mechanically transferable (MT)-type and multifiber push-on (MPO)-type connectors were constructed by using a monolithic 60-fiber ferrule that aligns five stacked 12-fiber ribbons. The MT- and MPO-type connectors have high packaging densities of 286 and 40 fibers/cm/sup 2/, respectively. We fabricated both types of connector. The average insertion loss of the MT type was 0.30 dB and that of the MPO type 0.70 dB, with and without index-matching material, respectively.

Design and performance of a multifiber backpanel type connector

A compact multifiber backpanel type connector has been constructed by applying backpanel housings to multifiber push-on (MPO) type plugs. Fabricated backpanel type connectors for 8-fiber ribbons exhibit a low insertion loss of 0.2 dB and a high return loss of 60 dB.

A new type of demountable optical device for coupling single-mode planar waveguides to a multifiber array using passive alignment

A novel demountable optical device is developed for coupling single-mode waveguides to a multifiber array using passive alignment. This device is fabricated by forming V-grooves on a waveguide chip and precisely molding both end portions of the chip. The 1/spl times/8 coupling device exhibits a low insertion loss of 10.7 dB and a small loss change of /spl plusmn/0.2 dB for 100 reconnections.

Design and performance of high-precision MT-type connector for 1.55-μm zero-dispersion-shifted fiber-ribbon cables

We have found that, for dispersion-shifted fiber (DSF) ribbons, the accuracy with which the fiberhole is positioned in the connector ferrule must be less than 0.6 /spl mu/m to realize a low average insertion loss of about 0.1 dB. By using the high-precision ferrules, we realized MT-type connectors that achieved a very low average insertion loss of 0.11 dB with a maximum of 0.37 dB. These connectors also satisfied mechanical and environmental stability requirements. We have confirmed that our high-precision MT-type connectors can be used for joining DSF ribbon.

Design and development of optical fiber joining techniques for efficient construction of aerial distribution cable systems

Two new optical fiber joining techniques have been developed for aerial distribution cables. One employs a compact mass-fusion splicer and the other involves a small mechanical splice. This paper describes their design and performance. These techniques are excellent for use in aerial sites and enable aerial distribution cable systems to be constructed efficiently. They will be useful for the economical construction of optical access networks for fiber-to-the-home.

Single-mode multifiber connector using an injection molded MT type ferrule and a quick assembly technique

In this paper, we describe the design and performance of a newly developed single-mode multifiber connector which employs an injection molded mechanically transferable (MT) type ferrule and a quick assembly technique. The connector is designed to be compatible with the MT connector. The ferrule is made using injection molded thermoplastic resin. This makes the ferrule production process easier, and also contributes to cost effectiveness. The ferrule can be assembled without polishing or heating by fixing cleaved fibers with a quick hardening adhesive. The ferrule assembly time is only 3 minutes. The fabricated 8-fiber ribbon connector exhibits a low insertion loss of 0.21 dB and a return loss of >45 dB with index-matching.

Design and performance of very high-density multifiber connectors employing monolithic 60-fiber ferrules

High-density high-count mechanically transferable (MT) type and multifiber push-on (MPG) type connectors were constructed by using a monolithic 60-fiber ferrule which aligns five stacked 12-fiber ribbons. The connectors have a high packaging density of 286 fibers/cm/sup 2/ for the MT type and 40 fibers/cm/sup 2/ for the MPO type. We fabricated both types of 60-fiber connector. The average insertion loss of the MT type was 0.20 dB with index-matching and that of the MPO type was 0.70 dB without index-matching.

Design and performance of modular jack type mini-MT connectors

Masaaki TakayaShinji NagasawaNTT Access Network Service SystemsLaboratories1-7-1 Hanabatake, TsukubaIbaraki, 305-0805 JapanE-mail: takaya@ansl.ntt.co.jpAbstract. We describe the design and performance of modular jacktype mini-MT connectors that employ a compact 2-fiber ferrule in a newlydesigned housing and adaptor. The basic mechanism for coupling thehousings is similar to that of a conventional electric modular jack typeconnector. Our connectors have a locking mechanism to prevent acci-dental disconnection and a high packaging density of 2 fibers/cm

High-Speed MT Connector Assembly Method

This letter describes a high-speed mechanically transferable (MT) connector assembly method. The method uses adhesive with a short hardening time and high reliability, and does not require a polishing process. First, we investigated an alpha-cyanoacrylate adhesive that hardens quickly and whose adhesive strength does not decrease under high humidity and high temperature conditions, thus ensuring its high reliability for outside use. We assembled an MT connector using our proposed high-speed assembly method. We confirmed that the assembly time could be reduced to less than 70% of the time required with the conventional assembly method. The MT connectors assembled using this method have a low insertion loss and stable environmental characteristics.

Design and performance of a modular jack type Mini-MT connector for high-density optical duplex connection

We have developed a modular jack type Mini-MT that employs a compact two-fiber ferrule in a housing. The connector mechanism is similar to that of a conventional electric modular jack type connector. The connector also has a locking mechanism to prevent accidental disconnection and a high packaging density of 2 fibers/cm/sup 2/. Fabricated connectors for single-mode two-fiber ribbons exhibit a low insertion loss of 0.17 dB and a high return loss of more than 40 dB.