| 摘要 |
FIELD: physics, optics.SUBSTANCE: protection device is designed to prevent unauthorised probing of protected segments of optical cable systems and networks for various purposes. Controlled neutralisation of probing radiation in an optical cable is carried out by raising the noise level to the information-bearing signal power level or higher using a fibre-optic noise generator. The fibre-optic noise generator is connected in the optical network (1) on a Mach-Zehnder interferometer scheme (1), which is formed by asymmetrically connected two coupling devices (5, 6). One arm of the interferometer includes the fibre-optic noise generator, formed by a fire-optic modulator (7) and a noise generator (8). Power supply (9) and control of the device is carried out on the protected optical network via a channel (10). The protection device (2) is connected to the optical network (1) by detachable or permanent connections (3, 4). The device does not affect light flux in a switched off state and, when turned on, has optical nonreciprocity on noise induced in transmitted signals.EFFECT: high efficiency of protecting information using optical channel noise masking methods.13 cl, 7 dwg |
