Improvements to a ground-based 40W 1.55 micron uplink transmitter for the Lunar Laser Communications
Demonstration (LLCD) are described. The transmitter utilizes four 10 W spatial-diversity channels to broadcast 19.4 -
38.9 Mbit/s rates using a variable-duty cycle 4-ary pulse position modulation. At the lowest rate, with a 32-to-1 duty
cycle, this leads to 320 W peak power per transmitter channel. This paper discusses a simplification of the transmitter
that uses super-large-area single mode fiber and polarization control to mitigate high peak power nonlinear impairments.
As deployment of fiber to the home (FTTH) within multiple dwelling units (MDUs) is growing, more technicians will be
involved in the deployment of optical drop cables, and there is a desire to use craft and practice similar to what is used
for copper cables. We introduce a solid bend insensitive fiber in this application that is backwards compatible to G.652D
fiber, and has macrobending, splice loss and system performance to meet the very demanding conditions of these
applications. A closer look at the demands of this environment has made it necessary to re-evaluate reliability in these
critical applications. We apply the Power Law Model to predict reliability in these demanding applications, and provide
experimental evaluation of the model through testing on optical fibers and cables. It will be shown that bends and tension
need to be considered together when evaluating the reliability of the passive optical plant.
The 7.1-magnitude earthquake on December 26, 2006 in the Strait of Luzon resulted in the failure of several
submarine cable systems. Seven of the nine cables that pass through the strait were damaged, disrupting
communications to China, Taiwan, Japan, Korea and Singapore. This recent event highlighted the
dependence of international communications on submarine fiber optic transmission systems.
This paper will review the evolution of optical fiber transmission line technology that has been deployed in the
long haul undersea telecommunications network. It will start with a discussion of the chronological evolution
of the optical fiber transmission line architecture in section one, then give more detail regarding the
technology that is still being deployed today.