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    • 6. 发明公开
    • Optical transmission system, optical transmitter and optical receiver used therefor for transmission of an angle-modulated signal
    • 一种光传输系统,光发射器和光接收器,用于发送一角度调制信号
    • EP0898389A2
    • 1999-02-24
    • EP98115815.7
    • 1998-08-21
    • MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    • Fuse, MasaruOhya, Jun
    • H04B10/155H04B10/158
    • H04B10/676H04B10/505H04B10/5051H04B10/5053H04B10/69
    • An angle modulating portion 1 converts an inputted electrical signal into a predetermined angle-modulated signal. An optical modulating portion 2 converts the angle-modulated signal outputted from the angle modulating portion 1 into an optical-modulated signal and sends the optical-modulated signal to an optical waveguide portion 3. An interference portion 6 separates the optical-modulated signal transmitted through the optical waveguide portion 3 into two optical signals having predetermined difference in propagation delay and then combines the optical signals. An optical/electrical converting portion 4 subjects the combined optical signal to homodyne detection, to acquire a demodulated signal of the original electrical signal and output the electrical signal. That is, the interference portion 6 and the optical/electrical converting portion 4 constitute a delayed detection system of an optical signal, so that the delayed detection system performs conversion processing of an optical signal into an electrical signal and angle demodulation processing simultaneously. In this way, a signal with a wide-band and a high-frequency can be acquired by demodulation without electrical part for wide-bands and high-frequencies.
    • 调制部1的角转换为电信号输入到一个预定的角度调制信号。 光学调制部分2的角度调制信号从角度调制部分1进入到光调制信号的输出的转换,并在光波导路部分3的光调制信号发送到一个干涉部分6分离的光调制信号反mitted通过 光波导路部分3成两个光信号具有预定传播延迟差,然后组合的光信号。 光/电转换部分4对组合的光信号到零差检波,以获得原始电信号,并且输出电信号的解调信号。 即,干涉部6和光/电转换部分4构成的光信号的延迟检测系统,所以没有延迟检测系统执行的光信号的转换加工成电信号,以和角度解调处理同时。 以这种方式,具有宽带和高频率的信号可以通过解调,而不对宽波段和高频电部分获得的。