Patent ID: 7454142
Filing Date: 2008-11-18
Classification: H04J

Abstract:
1. A data transmission method, comprising the steps of: forming first to fourth word string data based on parallel data representative of digital video signals having a frame rate set to 50 Hz or 60 Hz, an effective line number set to 1,080 for each frame, and an effective data sample number set to 1,920 for each line; producing first to fourth serial data based on the first to fourth word string data, respectively; converting the first to fourth serial data into first to fourth optical signals having first to fourth center frequencies, respectively, which are successively proximate to each other with a predetermined wavelength interval left therebetween; multiplexing the first to fourth optical signals to obtain a multiplexed optical signal; supplying the multiplexed optical signal to a first input/output terminal of a first bidirectional wavelength multiplexing coupler, which has said first input/output terminal and a second input/output terminal provided at an end thereof and has a third input/output terminal provided at the other end thereof, so that the multiplexed optical signal is led out to said third input/output terminal of said first bidirectional wavelength multiplexing coupler, the multiplexed optical signal led out to said third input/output terminal being signaled to an optical signal transmission cable so that the multiplexed optical signal is transmitted from a first end to a second end of said optical signal transmission cable; converting fifth serial data into a fifth optical signal; supplying the fifth optical signal to a fourth input/output terminal of a second bidirectional wavelength multiplexing coupler, which has said fourth input/output terminal and a fifth input/output terminal provided at an end thereof and has a sixth input/output terminal provided at the other end thereof, so that the fifth optical signal is led out to said sixth input/output terminal, the fifth optical signal led out to said sixth input/output terminal being transmitted to said optical signal transmission cable so that the fifth optical signal is transmitted from said second end to said first end of said optical signal transmission cable; leading out the multiplexed optical signal transmitted to said second end of said optical signal transmission cable to said fifth input/output terminal of said second bidirectional wavelength multiplexing coupler; performing a demultiplexing process and an optoelectric conversion process for the multiplexed optical signal led out to said fifth input/output terminal of said second bidirectional wavelength multiplexing coupler to reproduce the first to fourth serial data; leading out the fifth optical signal transmitted to said first end of said optical signal transmission cable to said second input/output terminal of said first bidirectional wavelength multiplexing coupler; and performing an opto-electric conversion process for the fifth optical signal led out to said second input/output terminal of said first bidirectional wavelength multiplexing coupler to reproduce the fifth serial data.