| 摘要 |
PROBLEM TO BE SOLVED: To provide a light receiver, a light repeater and a light transmitting system for reducing costs by reducing the required quantity of light amplifiers and dispersion compensation fibers occupying a large part in terms of costs. SOLUTION: An optical signal inputted through an optical circulator 201 is amplified by a direct light preamplifier 202, and then dispersion at a transmission path is compensated by a dispersion compensation fiber 208. The output light signal of the dispersion compensation fiber 208 is reflected on a fiber Bragg grating 209, and inputted to the dispersion compensation fiber 208 and the direct light preamplifier 202 again. The dispersion quantity of the dispersion compensation fiber 208 is set as the half of required dispersion quantity. The optical signal returned and transmitted through the direct light preamplifier 202 is inputted through the optical circulator 201 to an optic/electric conversion circuit 213. |
