11.1 Fundamental Optical Amplifier Types
439
Fig. 11.1 Four possible applications of optical amplifiers: a in-line amplifier to increase transmission distance, b preamplifier to improve receiver sensitivity, c booster of transmitted power,
d booster of signal level in a local area network
Power Amplifier Power or booster amplifier applications include placing the device
immediately after an optical transmitter to boost the transmitted power, as Fig. 11.1c
shows. This serves to increase the transmission distance by 10–100 km depending
on the amplifier gain and fiber loss. As an example, using this technique together
with an optical preamplifier at the receiving end can enable repeaterless undersea
transmission distances of 200–250 km. One can also employ an optical amplifier in a
local area network to compensate for coupler-insertion loss and power-splitting loss.
Figure 11.1d shows an example for boosting the optical signal in front of a passive
star coupler so sufficient power arrives at each receiver.
439
Fig. 11.1 Four possible applications of optical amplifiers: a in-line amplifier to increase transmission distance, b preamplifier to improve receiver sensitivity, c booster of transmitted power,
d booster of signal level in a local area network
Power Amplifier Power or booster amplifier applications include placing the device
immediately after an optical transmitter to boost the transmitted power, as Fig. 11.1c
shows. This serves to increase the transmission distance by 10–100 km depending
on the amplifier gain and fiber loss. As an example, using this technique together
with an optical preamplifier at the receiving end can enable repeaterless undersea
transmission distances of 200–250 km. One can also employ an optical amplifier in a
local area network to compensate for coupler-insertion loss and power-splitting loss.
Figure 11.1d shows an example for boosting the optical signal in front of a passive
star coupler so sufficient power arrives at each receiver.