SYSTEM OF ONE- AND TWO-SIDED COMPARISON OF TIME SCALES WITH DISTRIBUTED AMPLIFICATION BASED ON EFFECT OF FORCED COMBINATIONAL SCATTERING Russian patent published in 2021 - IPC G04C10/00 

FIELD: navigation.

SUBSTANCE: invention relates to devices for comparison and synchronization of time scales of the remote objects using a fiber-optic communication line connecting objects. Device for comparing and synchronizing the remote objects time scales consists of two components located at the objects, which are remote from each other, contains the following units on the first object: an event timer, a generator for forming the time scale of the specified object, a receiver of optical pulses with a spectral filter at the carrier frequency of the optical pulses and computer connected to it. The first object optical pulse generator is connected to the input of the splitter-multiplexer unit, which consists of a fiber-optic splitter, the first output of which is connected to the fiber-optic multiplexer. The output of this multiplexer is connected to the input of the photo-receiver, and the second input is linked to the circulator output, whereas the second output of the splitter is connected to the first input of the second fiber-optic multiplexer, the second input thereof is connected to the output of the pumping laser unit, and the output of the second multiplexer is connected to the input of the circulator, the input / output of which is linked to a fiber-optic communication line connecting two remote objects. The second object also comprises an event timer, as well as the following units connected to it: an intermediate generator, to which the second object's time scale generator is connected, an optical pulse receiver with a spectral filter at the optical pulse carrier frequency, and a computer connected to the intermediate generator. The input of the optical pulses receiver through a semitransparent mirror is connected to the output of the circulator, to the input of which the second object pumping lasers unit is connected; the input / output of the circulator is connected to the fiber-optic communication line connecting theses two remote objects. The computers of both objects are connected to the system for transmitting information about time intervals (for example, Ethernet network, a wireless network, etc.). The specific feature and advantage of this device is that the multiplexing unit is built into the block of splitters-multiplexers, which allows the radiation of the first object pump laser unit to be introduced into the fiber-optic communication line between the objects. At the second object, the fiber-optic communication line between the objects is connected through a circulator, which allows the radiation of the second object pump lasers unit to be introduced into it. This lead to distributed amplification of optical pulses based on the stimulated Raman scattering effect; at the same time the pulses, propagating both from the first object to the second and reflected from the second to the first one through a semitransparent mirror, are amplified both due to the co-directional pumping and due to the counter-pumping.

EFFECT: increased accuracy of the system operation due to linking optical pulses directed by the optical pulse generator at the second object to the fiber-optic communication line, to the object's time scale using the splitter-multiplexer unit, increased permissible distance between objects due to the use of pump laser units on each of the objects, increased accuracy of comparison or synchronization due to the use of signals in the optical range and direct binding of optical pulses to time scales, increased reliability and efficiency due to the use of the fiber-optic communication line, and the ability to compare or synchronize time scales using only one optical fiber of random length, including “dark” fiber, leased from common user circuit operators.

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