Microwave generating device based on orthogonal polarization mode Brillouin laser Kerr optical frequency comb

Abstract

The invention discloses a microwave generating device based on an orthogonal polarization mode Brillouin laser Kerr optical frequency comb. The microwave generating device comprises a control module; a tunable wavelength laser; an optical amplifier; a first port of the optical circulator receives the amplified pumping laser; after the silicon nitride micro-ring cavity excites Brillouin laser in the cavity, the silicon nitride micro-ring cavity and the reflected pumping laser output mixed laser to a second port of the optical circulator through the optical input end; an optical polarization beam splitter; the photon filtering module is used for receiving the Brillouin laser of the optical polarization beam splitter, selecting a corresponding frequency interval and then outputting a filtered photon signal; a first light detector; the silicon nitride micro-ring cavity realizes secondary pumping of Brillouin laser to form a Kerr optical frequency comb through tuning of the wavelength-adjustable laser by the control module. The Kerr optical frequency comb is formed through secondary pumping of stimulated Brillouin laser in an orthogonal polarization mode, specific comb tooth interval optical waves of the optical frequency comb are filtered, frequency beating is carried out on filtered optical wave signals, and needed microwave signal output is obtained.

Description

Technical field [0001] The present invention relates to the field of microwaves, and more particularly to a microwave generating apparatus relating to a orthogonal polarization mode BRBL flash. Background technique [0002] Modern radar, the microwave communication system needs to transmit, receives microwave signals, and uses a microwave vibration signal source in the transmitter and receiver, and then transmits the signal to the local oscillator signal in the transmitting channel direction and then transmits the power amplification. Out of the information, it is essential to obtain the information of the detection processing to extract the signal to extract the signal to extract the signal and the local frequency signal after the receiving channel is generally received and the communication signal is mixed. The low-phase noise of the local oscillator has always been a pursuit of modern radar and communication systems. [0003] In general, the quality of the microwave signal gen...

AI Technical Summary

Problems solved by technology

[0006] At present, the photon microwave scheme that uses this type of optical microcavity to generate microwave signals, the main problem is that the size of the optical microcavity such as F-P cavity is large, it is not easy to integrate, and the cavity mirror with high reflectivity is expensive and requires high assembly requirements; while magnesium fluoride, silicon Whispering gallery mode resonators of base and other dielectric materials also have processing difficulties, and the precision requirements of processing equipment are particularly high. In addition, there are difficulties in optical assembly and debugging, and complex production processes. This type of photonic microwave technology produces high-quality microwave signal output. , in order to improve the stability of the system, it is necessary to perform reverse self-injection locking on the DFB laser, which requires special optical mode field and phase matching for the reflected light of the resonator, which leads to complex debugging and assembly processes, which seriously increase the technical solutions of this type. The difficulty of large-scale application

[0007] With the development of silicon-based integrated photonics in recent years, the design of micro-ring cavity based on silicon nitride waveguide has attracted more and more attention, and the Kerr nonlinear effect of the micro-ring cavity based on silicon nitride through-ring waveguide A lot of research has been done, and there is also a related plan based on silicon nitride microring cavity to excite Kerr optical frequency comb to generate 10GHz microwave signal after beat frequency, but there are still major technical problems, such as the need for high-power communication band The laser signal is pumped and excited, and the high-power DFB laser has poor noise performance. The output optical noise performance of the pump laser will have a direct impact on the final beat-frequency microwave signal, making it difficult for the system to obtain a microwave signal output with better phase noise performance. ; Furthermore, in the process of outputting solitons based on the Kerr effect of the silicon nitride microring cavity, the pump laser needs to be detuned. The ring cavity is actually in a thermally unstable state, and the system cannot obtain a relatively stable long-term working state

[0008] For this reason, some have proposed a laser-assisted heating scheme. In addition to pumping the pump laser that generates the Kerr optical frequency comb, an auxiliary laser is added, and the pump laser is injected into the microring cavity in the opposite direction of the transmission direction. In the micro-ring cavity, through the precise control of the red detuning wavelength position of the pump laser and the blue detuning wavelength position of the auxiliary laser, the control and adjustment of the thermal balance of the micro-ring cavity in the single soliton state of the Kerr optical frequency comb is realized. Avoid the thermal instability in the single soliton state of the Kerr optical frequency comb, so as to realize the stable long-term operation of the silicon nitride microring cavity in the single soliton state of the Kerr optical frequency comb, but add a laser to inject the laser into the microring cavity for auxiliary heating Finally, the system needs to have two lasers for real-time control at the same time, which increases the difficulty of system control and system complexity. Therefore, there are no reports about the practical application of this scheme.

[0009] According to the latest research report, based on the fiber microcavity, the Brillouin laser is generated by pump laser injection excitation. The Brillouin laser has ultra-narrow linewidth and very low noise. The Brillouin laser is used as the pump light pair The microcavity is excited to generate a Kerr optical frequency comb. The advantage of this scheme is that the Brillouin laser is used to pump and excite the Kerr optical frequency comb, which avoids the high noise level caused by the initial high-power laser pump injection. It is a great progress for photonic microwave technology, but the scheme uses fiber F-P microcavity technology, by pressurizing the fiber F-P microcavity outside to adjust the stress inside the fiber material, and realize the microcavity resonance frequency parameter The adjustment of the optical fiber microcavity in this scheme is sensitive to external stress, the system stability is not high, and the parameter adjustment process is complicated

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