238
CONCEPTS IN TRANSMISSION TRANSPORT
Figure 9.30
Attenuation per unit length versus wavelength of glass fiber (Ref. 7).
Table 9.7
Summary of Receiver Diode Sensitivities, Average Received Optical Power in dBm,
BER
= 1 × 10
-9
Bit Rate
InGaAs PIN
InGaAs SAM/SAGM
a
APD
Ge APD
InGaAs
Photoconductor
(Mbps)
1.3
µm
1.55
µm
1.3
µm
1.55
µ
1.3
µm
1.55
µm
1.3
µm
1.55
µm
34
-52.5
-46
-55.8
45
-49.9
-51.7
-51.9
100
-40.5
140
-46
-45.2
-49.3
274
-43
-45
-38.7
-36
320
-43.5
420
-43
-41.5
450
-42.5
-39.5
-40.5
565
-33
650
-36
1000
-38
-37.5
-28
-34.4
1200
-33.2
-36.5
1800
-31.3
-30.1
2000
-36.6
-31
-28.8
4000
-32.6
a
SAGM stands for separated absorption, grating, and multiplication regions. SAM stands for separated absorption and
multiplication regions.
Source: Ref. 8.
Another type of detector is avalanche photodiode (APD), which is a gain device dis-
playing gains on the order of 1520 dB. The PIN diode is not a gain device. Table 9.7
summarizes various detector sensitivities with a "standard" BER of 1
× 10
-9
for some
common bit rates.
18
18
Some entities such as SPRINT (US) specify 1
× 10
-12
.
Summary :
Table 9.7 Summary of Receiver Diode Sensitivities, Average Received Optical Power in dBm, BER = 1 × 10 -9 Bit Rate InGaAs PIN InGaAs SAM/SAGM a APD Ge APD InGaAs Photoconductor (Mbps) 1.3 µm 1.55 µm 1.3 µm 1.55 µ 1.3 µm 1.55 µm 1.3 µm 1.55 µm 34 -52.5 -46 -55.8 45 -49.9 -51.7 -51.9 100 -40.5 140 -46 -45.2 -49.3 274 -43 -45 -38.7 -36 320 -43.5 420 -43 -41.5 450 -42.5 -39.5 -40.5 565 -33 650 -36 1000 -38 -37.5 -28 -34.4 1200 -33.2 -36.5 1800 -31.3 -30.1 2000 -36.6 -31 -28.8 4000 -32.6 a SAGM stands for separated absorption, grating, and multiplication regions.
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