A highly secure reflective coherent optical communication system transmitter and system
A technology of coherent optical communication and high security, which is applied to the transmitting end and system field of reflective coherent optical communication system, can solve the problems of interfering signal light, difficult security requirements, fiber theft, etc., and achieve phase noise and reasonable structure Effect
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Embodiment 1
[0038] Such as figure 1 As shown, a high-security reflective coherent optical communication system transmitter includes a polarization controller 1, a first polarization beam splitter 2, a modulator 3, a Faraday rotator, a polarization maintaining coupler 5a, and a photoelectric converter 6 And the electrical comparator 7, the optical carrier transmitted from the receiving end enters the polarization controller 1 through optical fiber transmission, outputs an optical carrier with a polarization state, and then passes through the first polarization beam splitter 2 to output two orthogonal beams of light; wherein, The first optical carrier is connected to the external feedback interface of the polarization controller 1 through the polarization-maintaining coupler 5a, the photoelectric converter 6 and the electrical comparator 7 in turn; the second optical carrier enters the modulator 3 for phase modulation of the optical carrier. After the modulator 3 changes the phase of the op...
Embodiment 2
[0048] Such as figure 2 As shown, a high-security reflective coherent optical communication system transmitter includes a polarization controller 1, a first polarization beam splitter 2, a modulator 3, a Faraday rotator, a polarization maintaining circulator 5b, and a photoelectric converter 6 And the electrical comparator 7, the optical carrier transmitted from the receiving end enters the polarization controller 1 through optical fiber transmission, outputs an optical carrier with a polarization state, and then passes through the first polarization beam splitter 2 to output two orthogonal beams of light; wherein, The first optical carrier is connected to the external feedback interface of the polarization controller 1 through the polarization maintaining circulator 5b, the photoelectric converter 6 and the electrical comparator 7 in turn; the second optical carrier enters the modulator 3 to perform phase modulation of the optical carrier, using After the modulator 3 changes...
Embodiment 3
[0056] Such as image 3 As shown, the difference between this embodiment and Embodiment 1 and Embodiment 2 is that a high-security reflective coherent optical communication system includes a laser 8, an isolator 9, a four-port coupler 10, a second polarization beam splitter A high-security reflective coherent optical communication system transmitting end 12 in the device 11 and embodiment 1; in this embodiment, the four-port coupler 10 is a 3dB coupler;
[0057] Such as image 3 Shown is the structure diagram of the reflective coherent optical communication system of the present invention. The solid line of the solid arrow is the forward light wave transmission path, the dotted line of the solid arrow is the reverse light wave transmission path, and the solid line of the hollow arrow is the feedback circuit part.
[0058] The laser 8 is arranged at the receiving end, and the laser 8 emits an optical carrier, which is connected to the first port 101 of the four-port coupler 1...
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