光パスコミュニケーションズ List of Products and Services

The Delay Measurement Unit (DPN2011B) is a unique product that can measure the total video delay time of a system composed of an imaging camera, video transmission system, and display monitor. The LED lamp that flashes on and off with the trigger signal generated from DPN2011B is displayed on the monitor via the camera and video transmission system. The ON/OFF state of the LED flashing image on the monitor is captured by a photodiode (PD) and converted into an electrical signal. The difference between this signal and the trigger signal, which represents the total video delay time, is automatically acquired using a PC-connected oscilloscope and dedicated software "AccuLatencyII," allowing for data recording of the entire system's delay time on a PC. Additionally, as an option for measuring video delay between two distant points, we have prepared a GPS module (DPN2015B) and a timing keeper (DPN2016A). The DPN2015B can receive the 1-second periodic pulse signal from GPS satellites at each remote location, serving as a reference for delay time measurement. It should be noted that GPS pulse signals can be difficult to receive depending on the satellite's position or if indoors, and the timing keeper DPN2016A is the device that can capture pulses while DPN2015B is receiving GPS pulses.

• Other electronic measuring instruments

This unit serves as the engine for remote coexistence "tele-session," which transmits 4K video in an uncompressed, zero-latency, bidirectional manner via optical transmission. It converts the HDMI output signal from a 4K video camera into a continuous optical signal for uncompressed transmission over fiber optics, and converts a similar optical signal received from the other party's 4K video camera back into HDMI output, allowing for the output of 4K/60p ultra-high-definition video (plus audio) to a 4K monitor with zero latency. The system connects two distant locations via fiber optics, with a 4K video camera, a 4K display, and a set-top box installed at each location. This unit converts the HDMI electrical interface signal, which is suitable for general-purpose devices, into serial optical signals at wavelengths of 1310 nm/1550 nm for long-distance transmission, and can also convert received optical signals back into HDMI. The signals propagate through the fiber optics at the speed of light in quartz glass (approximately 20 km in 1 millisecond) and are transmitted continuously and uncompressed, rather than in packets with different paths, enabling the sharing of 4K video in real-time with zero latency at both locations.

• others

This is a product for one-way optical transmission that separates the transmission and reception functions of the set-top box (DPN9001A). It converts HDMI output signals into serial optical signals for uncompressed transmission via optical fiber (DPN9042A, DPN9042B, DPN9043A) and can also convert optical signals back into HDMI input signals (DPN9044A). It allows viewing of 4K/60p ultra-high-definition video (audio) captured by a 4K camera or full HD/120p high frame rate video captured by a full HD camera from a distant monitor with "zero latency," meaning no delay is perceived by the human senses. By using dark fiber, long-distance optical transmission is possible, enabling real-time monitoring of large theaters, stadiums, public facilities, and social infrastructure from remote locations. When combined with optional optical splitters (DPN9045A, 4-way) / (DPN9049A, 8-way), it allows monitoring of 4K ultra-high-definition video and 120p high frame rate video at multiple points. Additionally, for cases where optical fiber is branched with an optical splitter or transmitted over long distances, a high-output version of the optical transmitter DPN9042B is also available.

• Other electronic parts