This paper analyses and studies the structure of star optical fiber transport network, reaches the algebraic relationship of optical link loss between single star optical fiber network and multiple star optical fiber network, and presents the calculation forma of optical divide ratio of optical distributors.

Realization technology of tunable optical splitter and its applications;

The article first through two model analyses the influence of optical splitter establishment to the optical fiber total quantity in PON, has drawn two principled conclusion which the optical splitter establishes.

An application of the Y-junction structure to 1×4 optical splitter and Mach-Zehnder modulator is analyzed.

Design optical divide ratio of optical distributor by ERC graph method;

Based on the single star optical fiber network and with the quotation of new notion of equivalent optical fiber, the idea and method of designing optical divide ratio in multiple star optical network optical distributor are introduced in this paper.

While the new design of up-down mode shall first select laser transmitter and optical branching device before the calculation of the transmission distance,then the geographically close laser receivers are linked to the optical branching device,thus being conducive to the maintenance,management,enlargement and the consisting of redundan.

In this system, an optical fiber branching device is employed in each optical transceiver, which splits the received optical signal into two parts: 3/4 for power supplies linkage control, 1/4 for extracting video and audio information.