325 results about "Optical data transmission" patented technology

An optical field receiver comprises an optical brancher that branches a received optical multilevel signal into first and second optical signals; an optical delayed detector that performs delayed detection on the first optical signal by a delayed detector with a delay time of T / 2 (where T is equal to a symbol time) and a phase difference of 90 degrees; a balanced optical receiver that converts the optical signal outputted from the first delay detector to an electric signal; and an optical intensity receiver that converts the second optical signal to an electric signal; and an electric field calculating part that generates, from the output signals of the first and second optical receivers, first and second reproduced signals indicative of the phase angle and amplitude value of the received symbol represented by the complex signal in each symbol time T.

The invention discloses a wireless link and wire link parallel data transmission method and system. The wireless link and wire link parallel data transmission method comprises the steps that A. a wireless link and a wire link which are used for transmitting data are established between a source terminal and a receiving terminal; B. at the source terminal, original data needing to be transmitted are distributed to the wireless link and the wire link according the transmission speed of the wireless link and the transmission speed of the wire link, and parallel data transmission is carried out simultaneously through the wireless link and the wire link; C. after receiving the data transmitted by the wireless link and the wire link, the receiving terminal restores the received date into the original data. According to the wireless link and wire link parallel data transmission method and system, parallel data transmission is carried out simultaneously through the wireless link and the wire link, and therefore the data transmission speed is improved, high-speed transmission of big data is facilitated, the links with the data transmission capacity are made full use of, and the transmission capacity of each link is brought into play to the maximum extent.

An optical transmitter for performing high-rate data communication by means of optical space transmission is provided, which can reliably perform optical axis adjustment manually and visually, and can prevent a device from being made large in size and manufacturing cost of the device from being increased by using an simply-constructed optical transmitter. Thus, the optical transmitter of the present invention comprises an incident beam restriction section operable to allow only a visible beam which is emitted by a terminal located within a range in which an infrared beam is emitted and incident thereon to pass therethrough, a reflection section operable to reflect the visible beam which has passed through the incident beam restriction section, and a light source operable to emit the infrared beam to pass through the reflection section according to a data transmission request signal from the terminal.