| 摘要 |
PROBLEM TO BE SOLVED: To monitor a signal routing of a multiple wavelength optical network by allowing the system to be made up of an output difference element connecting to an inverting input, a noninverting input and a dithering element, a dither signal generator and a feedback element giving input of a signal relating to an output of the dithering element to the inverting input of the difference element. SOLUTION: An intensity modulator 2 is arranged in series with an optical carrier 4 modulated by an information signal. A differential amplifier circuit 7 has an inverting input, a noninverting input and an output connecting to an input of the intensity modulator 2 as a dither element and is made up of an adder 6 and an operational amplifier conditioner 8. A signal generator 10 generates a desired identifier tone and overhead information to be added to a modulation optical carrier. Furthermore, the signal generator 10 connects to the noninverting input of the differential amplifier 7. Furthermore, the feedback element is used to generate a signal relating to an output of the intensity modulator 2 based on a modulation index of the identifier tone. |
