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Compact Latching Type Single-Mode Fiber Switches and Their Applications in Subscriber Loop Networks
IEICE TRANSACTIONS on Electronics
Publication Date: 1997/01/25
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Devices, Packaging Technology, and Subsystems for the Optical Access Network)
mechanical, single-mode, optical switch, latching, FTTH,
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This paper describes the design, characteristics, and applications of newly developed latching-type 1 2 and 1 8 single-mode fiber switches. These switches have been successfully fabricated using micromachine technology. To reduce insertion loss and light reflection, an index-matching oil is injected into the switches. The fabricated 1 2 switches exhibit a low insertion loss of 0.31 dB, high return loss of 51 dB, relatively fast switching speed of 2 ms, and low driving power of 9 mw. Switching operation is stable over 108 switching times. A practical 1 8 single-mode fiber switch was also constructed using seven 1 2 switches cascaded in three stages. The fabricated 1 2 and 1 8 switches have been applied to an NTT multichannel video distribution FTTH system to enhance system reliability.