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Toshiaki KATAGIRI Masao TACHIKURA Hideo KOBAYASHI
A method for constructing a compact non-blocking, large matrix-size, optomechanical switch is proposed. It can be switched arbitrarily by disconnecting and reconnecting ferrules on the matrix board. A 250500, 25-mm-ferrule-pitch, 800W855D945H (mm) switch is fabricated. Although the space above the board is densely packed with many ferrule-terminated-fibers, because of the way in which they are arranged and the control of their length, there is no discernible excess loss due to fiber bending.
Tadashi HAIBARA Masao TACHIKURA Michito MATSUMOTO Ryosuke ARIOKA
This paper describes a newly developed fully automatic arc-fusion splice machine, by which all splice processes such as stripping, cutting, alignment, fusion, and reinforcement are carried out sequentially without human intervention. Fibers are aligned by using movable arms with 2 µm position accuracy controlled by microscopic image processing. Spliced portion is reinforced by a pair of plates with hot-melt adhesive. By using the new machine, an average splice loss of 0.07 dB and a median tensile strength of 2.6 GPa with reinforcement are obtained for graded-index multimode fibers.
Toshiaki KATAGIRI Masao TACHIKURA Yasuji MURAKAMI
In mechanical splice technology, loss change during temperature cycling is mainly caused by fiber slippage or shift at the interface between fibers and fiber clamping substrates. The upper limit of the fabrication accuracy of the fibers and substrates restricts the total number of fibers in a splice. To overcome this, we propose a novel fiber clamping method using the elasticity of the substrate surface. We clamp the fibers more strongly at the fiber clamping ends, where the fibers need a greater friction force than around the butt-joint, to hold them in position. Taking the case of an 8-fiber ribbon splice, we compared linear marks on the substrates with the boundary linewidth curves for the onset of slippage. We achieved an insertion loss change of less than 0.1 dB during a temperature cycling test in accordance with Telcordia Technologies test specification. When we clamp fibers using the plasticity of the substrate surface, we can also reduce the required fabrication accuracy. However, insufficient accuracy causes an unexpected loss change due to fiber shift as a result of a plastic flow on the substrate surface in contact with the fibers.
Toshiaki KATAGIRI Masao TACHIKURA
A non-blocking optomechanical matrix switch has been developed that is assembled using cassettes as units. Switching can be accomplished between two ferrule-terminated-fiber groups by automatic disconnection and reconnection. The fabricated 100100, 3.1-mm-ferrule-pitch, 710W490D500H (mm) switch exhibits a mean insertion loss of 0.78dB in the 1.31-µm wavelength.
Mitsuru MIYAUCHI Masao TACHIKURA Toshiaki KATAGIRI Makoto SATO Atsushi IDE Tadashi HAIBARA Michito MATSUMOTO
A fully automatic, high-speed splicing machine for optical fiber ribbons has been developed to construct high-count optical cable lines in subscriber loops. Design procedure and detail performance of this machine is discussed in this paper. The developed machine achieves an average splice loss of less than 0.1 dB and a splicing time of about 2 min. for multi-mode five-fiber ribbons.
Masao TACHIKURA Toshiaki SATAKE Yasutake OHISHI
A discharge fusion splicing technique for fluoride optical fibers has been investigated. Discharge heating conditions were experimentally examined by making a fiber offset from the electrode axis. An average splice loss of 0.14 dB was achieved for 50µm-core fibers.
Toshiaki SATAKE Yutaka KATSUYAMA Masao TACHIKURA
A bit-error-free optical signal switching method from one to another fiber has been proposed for high-bit-rate optical transmission lines. The intensity modulated signal powers of 1.8 Gbit/s, which had been divided by an acousto-optic deflector and propagated through the 2 fibers, were recombined without bit-errors. Optical signals were switched successfully between 25 km long fibers without degradation of bit-error-rate performance.
Masao TACHIKURA Toshiaki SATAKE Yutaka KATSUYAMA
A novel optical signal splitting method using a holographic transmission grating is proposed for optical communication use. An input beam from a SM-fiber is variably split into two output SM-fibers. Its applicability to the bit-error-free switching of a 1.8 Gbit/s signal is successfully demonstrated.