We demonstrate dynamic optical path switching in 172-Gb/s OTDM transmissions of real ultra-high definition (UHD) video signals. To allow integration, the 172-Gb/s OTDM transmission system was composed of semiconductor devices, which are newly developed CMOS-based transceivers, quantum-dot SOAs and monolithic all-optical gates based on inter-sub-band transitions in a quantum well waveguide. In order to realize dynamically switchable OTDM (DS-OTDM), we developed a novel clock distribution scheme using an optical null header (ONH). The ONH, which was inserted between the OTDM signal pulses with a repetition rate equal to the clock frequency, enabled to achieve channel identification and fast yet robust clock recovery. An uncompressed UHD video signal, which required a bandwidth of 72 Gb/s for the real-time transmission, was transmitted using two channels of the 172-Gb/s DS-OTDM signal. The two channels were de-multiplexed at the same time immediately after the optical path switching. Through optical path switching, two UHD video signals were dynamically switched within a switching time of 15 µm and displayed on a screen successively.
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Takayuki Kurosu, Ken Tanizawa, Shu Namiki, Ryoichi Akimoto, Haruhiko Kuwatsuka, Toshifumi Hasama, Hiroshi Ishikawa, Tsuyoshi Nakatogawa, Kimiyuki Oyamada, Y. Tanaka, Satoshi Ide, H. Onaka, and T. Asami, "Dynamic Optical Path Switching in 172-Gb/s OTDM Transmissions of Ultra-High Definition Video Signals Using Fast Channel-Identifiable Clock Recovery and Integratable Devices," J. Lightwave Technol. 31, 594-601 (2013)