A super large microwave delay device

Abstract

The invention discloses a superlarge microwave delay device. The device comprises first and second optical couplers, first and second optical band-pass filters, an optical delay unit and a photoelectric detector. Two output ends of the first optical coupler are sequentially connected with the first and second optical band-pass filters; the output end of the second optical band-pass filter is connected with the input end of the optical delay unit; and two input ends of the second optical coupler are sequentially connected with the first optical band-pass filter and the optical delay unit. According to the invention, two band-pass filters are utilized to respectively carry out selective filtering on one one-order sideband and an optical carrier, and the optical or a certain one-order sideband are coupled by the second optical coupler for output after being delayed by a delay waveguide. Assuming that an introduction delay of the optical delay unit is delta t, a delay of a beat note signaloutput by the delay device is (omega / omega) delta t, i.e., the delay of the beat note signal is increased to omega / omega times of a delay of the optical carrier. Frequency of an optical wave is higher than that of a microwave by four orders, and thus, the microwave can obtain a superlarge delay.

Description

technical field [0001] The invention belongs to the field of optics and microwave technology, and more specifically relates to an ultra-large microwave delay device. Background technique [0002] Microwave delay is widely used in electronics, communication, signal processing and other fields, and is one of the key components. At present, it is very difficult to achieve ultra-large delay (tens of ns, equivalent length nearly 100 times the wavelength) in the microwave frequency band, especially in the millimeter wave band. The traditional cable delay has a very large insertion loss and is bulky, making it difficult to use. However, in practical applications, there is still a demand for a large delay. For example, in an optoelectronic oscillator (OEO), in order to reduce the phase noise of the OEO output microwave signal, a large microwave delay is required. The current OEO is mainly Using a long optical fiber for time delay, the long optical fiber causes an increase in the vo...

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Problems solved by technology

[0003] In view of the above defects or improvement needs of the prior art, in order to solve the defect of small microwave delay on the chip, the present invention provides an ultra-large microwave delay device, which uses optical bands whose center wavelengths are respectively the carrier wavelength and the ±1st-order sideband wavelength. The modulation signal is filtered by the pass filter, and the output signal of one of the band-pass filters is delayed and then combined with the other band-pass filter to achieve low loss and ultra-long delay

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