Introduction of Optical Space Communication Group

Overview

In order to meet future needs for high data-rate space communications due to an expected wider range of applications in the field of mobile communications and increased manned space activity, we have been studying free-space laser communications (FSLC). FSLC shall provide us with a high data-rate and interference-free optical communications links connecting satellites and space stations in a space network and satellites with ground stations as part of the terrestrial fiber network.

Targets of the study

High-speed free-space laser communications
Deep space (long distance) laser communication system
Key technologies for small and light-weight optical terminal

Current research topics

R&D for high-speed free-space laser communications

In order to realize a long-distance (10km) and high-speed (10Gbps) free-space communication link on the ground, we are investigating the various effect on the communication link quality by using a dedicated terminal with an acquisition and tracking capability. We also study on an atmospheric turbulence to the communication system. We developed a prototype adaptive optics system dedicated for the 1.5-micron laser communication.

Deep space (long distance) laser communication system

As a means to make an initial acqusition to a satellite from the 1.5m telescope facility, we are investigating to use a X-band aircraft detection radar and to detect and track the satellite by using interferrometric signal processing method in a bistatic receiving antenna configuration. We will try to track a large satellite/spacecraft in a low altitude orbit

Basic studies on advanced optical devices

In order to realize a small and light-weight optical terminal, we are developing optical components and device and also evaluating off-the-shelf optical components.

Operation of the Optical Ground Station

We are operating a multi-purpose telescope facility with an aperture of 1.5 meters in diameter.

Recent achievement

The successful optical communication link between NICT ground station and the KIRARI (OICETS) satellite

Past achievements

Demonstration of ground-to-satellite laser communication using ETS-VI(1994-1996)
Adaptive optics system for free space laser communication(1994-)
Optical transceiver at 10Gbps(1997-1998)
LC beam deflector and LC micro lens(1997-2001)