Optical fiber milimeter wave communication device based on double saw-tooth wave frequency sweep

Abstract

Disclosed is an optical fiber millimeter wave communication device based on double saw-tooth wave scanning, which relates to optical fiber communication field. The connection mode includes that: the output of a laser unit (1) is connected with the input of an optical splitter (2); two outputs of the optical splitter are respectively connected with the inputs of a first optical frequency modulator(31) and a second optical frequency modulator (32); the output end of a binary bit sequence generator (4) is connected with the input of a logic inverter (5); the output of the logic inverter (5) is connected with the input of an electrical splitter (6); two outputs of the electrical splitter are respectively connected with bit inputs of a post peak saw-tooth wave generator (7) and a leading peaksaw-tooth wave generator (8); the outputs of the post peak saw-tooth wave generator and the leading peak saw-tooth wave generator are respectively connected with the electrical signal inputs of the first optical frequency modulator and the second optical frequency modulator; the outputs of the first optical frequency modulator and the second optical frequency modulator are respectively connected with two inputs of an optical combiner (9); the output of the optical combiner is connected with the input of a photodiode (10). Based on the connection mode, the millimeter wave communication of binary bit data is realized.

Description

technical field [0001] The invention relates to the technical field of optical fiber communication and millimeter wave optical generation, in particular to an optical fiber millimeter wave communication device based on double sawtooth wave frequency sweep. Background technique [0002] As people's demand for information is increasing, the current wireless spectrum resources can no longer meet people's needs. Wireless communication is developing towards higher frequency carrier communication, and millimeter wave communication is bound to become one of the future development directions. The use of millimeter wave carriers for communication can provide greater capacity for the system, which is conducive to alleviating the current shortage of spectrum resources. However, with the increase of signal frequency, the attenuation loss of millimeter waves caused by the atmosphere and water mist is very large, which limits the base station. The coverage of dense base stations will incr...

AI Technical Summary

Problems solved by technology

The methods that have been proposed so far can be mainly summarized into the following three categories, namely: (1) The optical fiber millimeter wave communication system using the principle of optical heterodyne detection, the advantage is that the generated millimeter wave frequency is highly adjustable, and the disadvantage is that it cannot overcome the phase noise It leads to widening of millimeter-wave linewidth; (2) The optical fiber millimeter-wave communication system based on harmonic generation technology has the advantage of using low-frequency microwaves to generate high-frequency harmonics, but the disadvantage is that other harmonics divide power and cause interference; (3 ) The optical fiber millimeter wave system using the external modulation method has the advantage that the use of the external modulator to generate millimeter wave harmonics has strong operability, and the disadvantage is that the accuracy of the external modulator is very high, and the cost is correspondingly increased. The above various systems Each has its own characteristics and application occasions, but all have the disadvantages of complex system structure and high cost requirements

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