Page 130 - Optical Switching And Networking Handbook

06_200023_CH05/Batesx 1/17/01 8:19 AM Page 115

Wave-Division and Dense-Wave-Division Multiplexing 115

Table 5-2 Lower errors BER approximates 10 -15 for fiber, whereas copper
–8
–4
will be in the 10 to 10 range.
Advantages of
Attractive cost per foot Cost per foot for fiber is now approximately $0.20
Fiber over Other compared with $0.13 for copper.
Media
Performance Immune from RFI and EMI without extra cost of
shielding on copper.
Ease of installation Ease of installation due to lower weight and
thickness.
Distances Greater distance with fewer repeaters. Now can
achieve 30 to 200 miles without repeaters. Copper
and radio limited to less than 30 miles.
Bandwidth improvements Fiber nearing 1 Tbps, copper 100 Mbps, and coax
1 Gbps
Capable of carrying Using TDM and WDM, the fiber is both digital and
analog and digital frequency multiplexed, increasing capacity.

Input Frequency Division A
Figure 5-6
Combinations
1
of frequency and
time multiplexing
produce the B
Frequency Division
results in WDM.
Time
2 Divsion A A C C B A AA
B B
C
Frequency Division
C
3

Time
Frequency