TRANSMISSION LOSS BUDGET DESIGN OF THE OPTICAL STAR-SHAPED RING NETWORK

One high-fidelity ring-type optical transmission network is the star-s haped ring network having a multiport accessory in its hub. The presen t paper describes the transmission loss budget design for the star-sha ped ring network that takes into account continuously received interfe rence signals. Conventionally, the S/X value, which is the ratio of th e main signal power to an interference signal power, has been used to evaluate the degree of interference, First, the factors responsible fo r determining this ratio are discussed and then a design chart is deri ved to correlate the S/X value with the level difference between the t ransmitter and the receiver for the network. Based on this design anal ysis, multiport optical accessors are fabricated; and measured results are presented. It is demonstrated that the star-shaped ring network w ith desirable performance can be realized successfully. Finally, a met hod to lower the level difference between the transmitter and the rece iver using multiwavelengths is proposed.