Abstract
Fiber-to-the-home (FTTH) has now reached the stage where it is providing
real-time broadband services. Since even a temporary suspension of
broadcasting and telephone services cannot be permitted, it has become
important to improve the reliability of FTTH network operation. We have
developed an advanced optical line switching system that diverts
transmission signals from an in-service line to a spare line without
interrupting communication. This system is realized by equalizing the
transmission times of the signals sent through dualized lines composed of an
in-service line and a spare line. The transmission times are equalized by
employing two techniques in the dualized lines. One is a technique that uses
a free space optics system to tune the optical line length continuously. The
other is a technique for measuring a wide range of time differences between
signals transmitted through the dualized lines. Since the dualized lines
have a Mach–Zehnder interference structure, the differences can be
detected with high accuracy by employing dual-light interferometry. We
applied this switching system to a gigabit Ethernet passive optical network
(GE-PON) during transmission and succeeded in switching in-service lines
without inducing any frame loss.
© 2010 IEEE
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