| 摘要 |
PURPOSE:To provide a light amplifier of a specific gain capable of operating in different frequency bands for multiplex communications either by comparing its output with input signals, or by dividing an input signal according to frequency band, amplifying the divided signals, and then combining them. CONSTITUTION:An input optical signal 1 is split by a branch 9. One branched signal 22 is supplied to an intensity detector 12, which produces an input intensity signal 24. The other branched signal 21 is amplified by a light amplifier 11, which produces an optical output signal 23. The optical output signal 23 is split by a branch 10. One branched signal 25 is supplied to an intensity detector 13, which produces an output intensity signal 26, while the other branched signal becomes an output signal 7. The input intensity signal 24 and the output intensity signal 26 are compared by a comparator 14 to determine the intensity ratio between the input signal 1 and the output signal 7, and thus an intensity ratio signal 27 is produces. |
