13.9 Summary
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Fig. 13.49 Figure 13.49 for Problem 13.9
13.12 Consider the passive optical network shown in Fig. 13.40. Assume the
following:
(a) Laser sources at 1310 and 1490 nm can launch optical powers of 2.0
and 3.0 dBm, respectively, into a fiber.
(b) The passive optical splitter is 10 km from the central office..
(c) The users are 5 km from the power splitter..
(d) The insertion losses are 13.5 and 16.6 dB for 1 × 16 and 1 × 32 splitters,
respectively.
(e) The fiber attenuation is 0.6 dB/km at 1310 nm and 0.3 dB/km at
1550 nm.
(f) For simplicity assume there are no connector, splice, or other losses in
the link.
Find the total link loss for the following four situations:
(i) A 1310-nm laser transmits upstream (user to central office) through a
1 × 16 splitter.
(ii) A 1310-nm laser transmits upstream through a 1 × 32 splitter.
(iii) A 1550-nm laser transmits downstream through a 1 × 16 splitter.
(iv) A 1550-nm laser transmits downstream through a 1 × 32 splitter
[Answers: (i) 22.5 dB; (ii) 25.6 dB; (iii) 18.0 dB; (iv) 21.1 dB].