A frequency modulation rate variable laser chirp device and a frequency modulation method thereof
By introducing an adjustable fiber delay line unit into the optoelectronic phase-locked loop, the time delay of light is changed, which solves the problem of fixed frequency modulation rate in existing devices and realizes flexible adjustment of frequency modulation rate and improvement of signal quality.
CN115912051BActive Publication Date: 2026-06-26SOUTHWEST PETROLEUM UNIV
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SOUTHWEST PETROLEUM UNIV
- Filing Date
- 2022-11-17
- Publication Date
- 2026-06-26
Smart Images
Figure CN115912051B_ABST
Abstract
The application discloses a frequency modulation rate variable laser linear frequency modulation device and a frequency modulation method thereof. The device comprises a wideband tunable laser, a micro-optical lens, a beam splitter, an adjustable optical delay unbalanced MZ interferometer, a balanced photodetector, a phase discriminator, a loop filter, an up / down switch control circuit and an integrator. The adjustable optical delay unbalanced MZ interferometer comprises two couplers and an adjustable optical fiber delay line unit. According to the relationship between the linear frequency modulation light frequency and time of the upper and lower arms of the interferometer, when the delay amount of the adjustable optical fiber delay line unit changes, the frequency modulation rate of the output laser can be changed. The application changes the time delay of the light by using the adjustable optical fiber delay line, so that the frequency modulation rate can be changed.
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