|
PMD
Ps/km1/2
|
受 限 距 离 km
|
|
10Gb/s
|
20Gb/s
|
40Gb/s
|
80Gb/s
|
160Gb/s
|
320Gb/s
|
640Gb/s
|
|
0.001
|
100000000
|
25000000
|
6250000
|
1562500
|
390625
|
97656.25
|
24414.06
|
|
0.005
|
4000000
|
1000000
|
250000
|
62500
|
15625
|
3906.25
|
976.5625
|
|
0.01
|
1000000
|
250000
|
62500
|
15625
|
3906.25
|
976.5625
|
244.1406
|
|
0.03
|
111111.11
|
27777.78
|
6944.444
|
1736.111
|
434.0278
|
108.5069
|
27.12674
|
|
0.05
|
40000
|
10000
|
2500
|
625
|
156.25
|
39.0625
|
9.765625
|
|
0.06
|
27777.778
|
6944.444
|
1736.111
|
434.0278
|
108.5069
|
27.12674
|
6.781684
|
|
0.07
|
20408.163
|
5102.041
|
1275.51
|
318.8776
|
79.71939
|
19.92985
|
4.982462
|
|
0.08
|
15625
|
3906.25
|
976.5625
|
244.1406
|
61.03516
|
15.25879
|
3.814697
|
|
0.09
|
12345.679
|
3086.42
|
771.6049
|
192.9012
|
48.22531
|
12.05633
|
3.014082
|
|
0.1
|
10000
|
2500
|
625
|
156.25
|
39.0625
|
9.765625
|
2.441406
|
|
0.2
|
2500
|
625
|
156.25
|
39.0625
|
9.765625
|
2.441406
|
0.610352
|
|
0.3
|
1111.1111
|
277.7778
|
69.44444
|
17.36111
|
4.340278
|
1.085069
|
0.271267
|
|
0.4
|
625
|
156.25
|
39.0625
|
9.765625
|
2.441406
|
0.610352
|
0.152588
|
|
0.5
|
400
|
100
|
25
|
6.25
|
1.5625
|
0.390625
|
0.097656
|
|
0.6
|
277.77778
|
69.44444
|
17.36111
|
4.340278
|
1.085069
|
0.271267
|
0.067817
|
|
0.7
|
204.08163
|
51.02041
|
12.7551
|
3.188776
|
0.797194
|
0.199298
|
0.049825
|
|
0.8
|
156.25
|
39.0625
|
9.765625
|
2.441406
|
0.610352
|
0.152588
|
0.038147
|
|
0.9
|
123.45679
|
30.8642
|
7.716049
|
1.929012
|
0.482253
|
0.120563
|
0.030141
|
|
1
|
100
|
25
|
6.25
|
1.5625
|
0.390625
|
0.097656
|
0.024414
|
|
2
|
25
|
6.25
|
1.5625
|
0.390625
|
0.097656
|
0.024414
|
0.006104
|
|
3
|
11.111111
|
2.777778
|
0.694444
|
0.173611
|
0.043403
|
0.010851
|
0.002713
|
|
4
|
6.25
|
1.5625
|
0.390625
|
0.097656
|
0.024414
|
0.006104
|
0.001526
|
|
5
|
4
|
1
|
0.25
|
0.0625
|
0.015625
|
0.003906
|
0.000977
|
|
6
|
2.7777778
|
0.694444
|
0.173611
|
0.043403
|
0.010851
|
0.002713
|
0.000678
|
|
7
|
2.0408163
|
0.510204
|
0.127551
|
0.031888
|
0.007972
|
0.001993
|
0.000498
|
以上表格为根据公式计算的不同速率时PMD对系统使用的受限距离，现在光纤的PMD指标通常在0.2Ps/km1/2以下，
根据上表的计算，因为在10G系统中PMD受限的距离在2500KM以上，最大可达10000KM以上，因此现光缆线路设
计中，在10G系统中可以完全不用为PMD受限距离担心使用的问题。
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