Page 157 - Optical Communications Essentials

Passive Optical Components

Passive Optical Components 147

TABLE 9.1. Typical Coupling Ratios and Insertion
Losses in Optical Fiber Couplers
Coupling ratio Insertion loss
(primary/secondary) (PP/SP), dB
50/50 3.4/3.4
60/40 2.5/4.4
70/30 1.8/5.6
80/20 1.2/7.6
90/10 0.6/10.8
95/05 0.4/14.6

Figure 9.2. A typical package for a tap coupler. (Photo courtesy of Koncent Communication; www.koncent.com.)

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