ABSTRACT
Passive devices work without using an external power supply, while active devices need external power to work. This chapter presents Some common passive fiber optic devices. The most simple passive fiber optic devices are the couplers. The chapter also presents one section that enables the student to practice designing, manufacturing, and testing a 50/50 Y-coupler in the lab. The student can plan the manufacturing process and determine the process and handling times that are required to build one Y-coupler. The student will manufacture and test a Y-coupler in the lab. Connecting Y-couplers to a fiber optic cable is expensive, and significant loss is experienced in the connections. However, Y-couplers of this kind are used extensively in complex planar devices. Star couplers are typically used in local area networks and metropolitan area networks. The manufacturing cost of the twin core fiber cable is very low compared to the cost of other designs.
