Optical Fiber Communications 4th Edition by Gerd Keiser

Exercise 10

Consider the passive optical network shown in Fig. 13.41. 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