| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problems that an optical device conventionally used in a high frequency signal light transmitter used for the backbone of a radio access system using a microwave band is expensive and signal quality is degraded by inferior frequency response characteristics when an inexpensive optical device is used. <P>SOLUTION: By using a high frequency driving part 110 which compensates the electric / optic conversion efficiency of an electric / optic conversion part 120 near the carrier wave frequency of signals and modulating the signals by using the modulation system of a narrow band, CNR characteristics at the time of light transmission are improved, the influence of frequency deviation is reduced and thus an inexpensive and low-performance optical device can be used. Thus, compared to the light transmitter using the conventional optical device of a wide band, an inexpensive high frequency light transmitter can be provided. <P>COPYRIGHT: (C)2004,JPO |
