| 摘要 |
An optical transmitter for use in high-density WDM (Wavelength Division Multiplexing) optical transmission system generates an RZ-AMI (Return to Zero-Alternate Mark Inversion) signal which contains not only high reception sensitivity suitable for a high-density WDM optical transmission system, but also a narrow spectrum bandwidth. The transmitter includes a precoder for coding an input binary-data electric signal, a modulation drive amplifier for amplifying the coded signal, a light source for generating an optical carrier signal, a first optical modulator for modulating a phase of the optical carrier signal upon receiving the amplified signal from the amplifier, a second optical modulator for modulating an output signal of the first optical modulator into an RZ (Return to Zero) signal, and an optical filter for filtering an output signal of the second optical modulator to tailor the output signal for a predetermined bandwidth.
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