The feasibility of optical wireless communication links using high-brightness illumination light-emitting diodes (LEDs) is experimentally verified. We measure the modulation bandwidths of red-, green-, and blue-colored LEDs and the eye patterns for optical wireless links incorporating single- and multi-LED transmitters. The eye patterns of single-color red, green, and blue LEDs are compared. An optical communication link consists of an optical transmitter module with seven LEDs, and a packaged silicon photodiode as a receiver. The bit error rate (BER) curves are measured by varying the link distance and the horizontal offset to check their dependencies on the BER. The optical wireless communication link incorporating the transmitter with seven high-brightness illumination LEDs can support 10-Mb/s data transmission without any optimized optical filter to enhance optical gain. Based on the experimental results, it is demonstrated that a communication link with illumination LEDs could be used for short-reach optical wireless communication systems.
The study of an optical wireless communication link using illumination light-emitting diodes (LEDs) has been performed. The eye patterns and bit error ratio of LED transmitter are measured and compared according to the modulation frequency and the distance between optical source and receiver. From the experimental demonstration, it is shown that the optical wireless communication link using illumination LEDs can perform 20 Mb/s data transmission.
The feasibility of optical wireless communication link using high-brightness illumination light-emitting diodes (LEDs) is reported. The eye patterns of single-color red, green, and blue LEDs are measured and compared. For the blue LED, the 3 dB bandwidth is measured. An optical transmitter module incorporates seven LEDs as a basic
building block for planar light and a packaged silicon photodiode is used as a receiver. From the experimental demonstration with the 7-LED transmitter and a receiver, it is shown that the optical wireless communication link using high-brightness illumination LEDs can perform 10 Mb/s data transmission without any optimized optical filter to enhance optical gain.
A clock and data recovery circuit using the clock jitter reduction technique is proposed for a 622-Mbit/s burst-mode data stream. The clock jitter reduction is achieved by controlling the clock duty cycle with the phase information of the recovered clock. The proposed clock recovery circuit, based on the gated oscillator, recovers a low-jitter output clock with up to 4090 consecutive zeros.