A directly modulated full duty parabolic pulse generating device

Abstract

The application discloses a kind of directly modulated full-occupancy parabolic pulse generating device.It includes laser source (1), laser source (1) is connected with the input end of intensity modulator (2), the radio frequency end of intensity modulator (2) is connected triangular signal generator (3), and the output end of intensity modulator (2) is final output end.The application can directly modulate to obtain full-occupancy parabolic pulse, and the repetition frequency of the obtained parabolic pulse is twice the frequency of modulation signal, without multiplexing, device is simple, easy to adjust;At the same time, the shape and size of the obtained parabolic pulse can be controlled by changing the voltage of the applied radio frequency signal.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and in particular to a device for generating a parabolic pulse with direct modulation of full duty cycle. Background Technology

[0002] Parabolic pulses possess the characteristic of achieving perfect quadratic phase modulation of time variables, generating linear chirp. As an important pulse type in optical communication, they are widely used in time imaging, optical communication, optical signal detection, and optical signal processing. Existing parabolic pulse generation methods are structurally complex and difficult to operate (Ng TT, Parmigiani F., Ibsen M., Zhang ZH W, Petropoulos P., Richardson D, J.. Compensation of Linear Distortions by Using XPM With Parabolic Pulses as a Time Lens. IEEE Photon. Technol. Lett., Vol. 20, 2008, pp. 1097-1099), and are difficult to control due to factors such as SPM and FWM in nonlinear optical fibers. Therefore, generating parabolic pulses with a stable and simple device has significant scientific and application value. Summary of the Invention

[0003] The purpose of this invention is to provide a device for directly modulating a full-duty-hour parabolic pulse generator. This invention can directly modulate a full-duty-hour parabolic pulse, and the repetition frequency of the obtained parabolic pulse is twice the frequency of the modulating signal. It eliminates the need for multiplexing, is simple in design, and is easy to adjust. Furthermore, the shape and size of the obtained parabolic pulse can be controlled by changing the voltage of the applied radio frequency signal.

[0004] The technical solution of the present invention is as follows: A direct modulation full-duty parabolic pulse generator includes a laser source, the laser source is connected to the input terminal of an intensity modulator, the radio frequency terminal of the intensity modulator is connected to a triangular signal generator, and the output terminal of the intensity modulator is the final output terminal.

[0005] In the aforementioned direct-modulation full-duty parabolic pulse generator, the intensity modulator is a Mach-Zehnder modulator.

[0006] Beneficial effects Compared with existing technologies, this invention connects the laser source to the input of an intensity modulator, connects the RF end of the intensity modulator to a triangular signal generator, and uses the output of the intensity modulator as the final output. This structure utilizes the modulation function curve of the intensity modulator to control its bias voltage, using the triangular signal generated by the triangular signal generator as its RF source to obtain a directly modulated full-duty parabolic pulse. See details... Figure 1 In this invention, the laser source output passes through an intensity modulator. Utilizing the modulation function curve of the intensity modulator, the radio frequency bias voltage of the intensity modulator is set at the minimum or maximum point of the modulation function curve. Since the applied radio frequency signal is a triangular waveform, it can perfectly replicate the curve information of the minimum or maximum point of the modulation function curve. Because its curve function is the square of a sine, the trough or peak position can be approximated as a parabola. Thus, a directly modulated full-duty parabolic pulse is obtained. In summary, this invention can directly modulate a full-duty parabolic pulse. The repetition frequency of the obtained parabolic pulse is twice the frequency of the modulation signal, resulting in high signal quality, good stability, and convenient operation. It eliminates the need for multiplexing full-duty output and simplifies the device. Furthermore, this invention can control the shape and size of the obtained parabolic pulse by changing the voltage of the applied radio frequency signal; its control is simple and easy to adjust. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the working principle of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention.

[0008] Figure labels: 1-laser source, 2-intensity modulator, 3-triangle signal generator. Detailed Implementation

[0009] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0010] Example 1. A direct-modulation full-duty-hour parabolic pulse generator, configured as follows: Figure 1-2 As shown, it includes a laser source 1, which is connected to the input terminal of an intensity modulator 2. The radio frequency terminal of the intensity modulator 2 is connected to a triangular signal generator 3, and the output terminal of the intensity modulator 2 is the final output terminal.

[0011] Working principle: First, the laser source 1 outputs light into the intensity modulator 2. Using the modulation function curve of the intensity modulator 2, the bias voltage is set at the minimum point of the modulation curve. The radio frequency signal is a triangular signal (generated by the triangular signal generator 3), which perfectly replicates the curve information at the minimum point of the modulation curve. Since the curve function is the square of a sine, the trough position can be approximated as a parabola. Therefore, a directly modulated, full-duty parabolic pulse with an upward opening can be obtained.

[0012] The aforementioned intensity modulator 2 is a Mach-Zehnder modulator.

[0013] The present invention is not limited to the embodiments described in the specific implementation. Other implementation methods derived by those skilled in the art based on the technical solution of the present invention also fall within the scope of the technical innovation of the present invention. Obviously, those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the present invention. Therefore, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include these modifications and variations.

Claims

1. A device for directly modulating a full-duty-hour parabolic pulse generator, characterized in that, It includes a laser source (1), the laser source (1) is connected to the input terminal of an intensity modulator (2), the radio frequency terminal of the intensity modulator (2) is connected to a triangular signal generator (3), and the output terminal of the intensity modulator (2) is the final output terminal; the intensity modulator (2) is a Mach-Zehnder modulator, and the bias voltage of the Mach-Zehnder modulator is set at the minimum point or the maximum point.

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