BIDIRECTIONAL OPTICAL TRANSMISSION SYSTEM AND OPTICAL TRANSMISSION/RECEPTION DEVICE

摘要

The optical transmission circuit of a slave device needs no light emitting element, and there is no need to control or maintain, with very high precision, the wavelength of the light emitting element in the optical transmission circuit of a slave device. In a bidirectional optical transmission system for allowing bidirectional transmission between a main device and a slave device, the main device comprises an optical transmission circuit for transmitting, to the slave device, a downstream optical signal obtained by superimposing a bias component on a signal component modulated with a downstream signal; and an optical reception circuit for detecting an upstream signal from an upstream optical signal transmitted from the slave device. The slave device comprises an optical reception circuit for detecting a signal component from a downstream optical signal transmitted from the master device; and an optical transmission circuit for transmitting, to the main device, an upstream optical signal obtained by modulating a part of a downstream optical signal with an upstream signal by use of a saturated amplification/attenuation circuit.