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Direct-phase-modulation-based femtosecond wideband pulse generation optical ring

A phase modulation, broadband pulse technology, used in optics, nonlinear optics, instruments, etc., can solve the problems of the modulation effect being difficult to meet the experimental requirements, not suitable for systems with a central wavelength of 1054nm, etc., to avoid nonlinear effects, achieve controllable effects

Inactive Publication Date: 2011-09-07
SHANGHAI JIAO TONG UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] However, the center wavelength of this prior art is 1550nm, and the amplifier used in the fiber ring is an erbium-doped fiber amplifier, which is not suitable for systems with a center wavelength of 1054nm
Moreover, only one phase modulator is used in the system, and the modulation effect is difficult to meet the experimental requirements.

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Embodiment Construction

[0016] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0017] Such as figure 1 As shown, this embodiment includes: a first optical path switch, an amplifier, a wavelength division multiplexer, a narrow-band fiber filter, a second optical path switch and two phase modulators that are sequentially connected in series to form a loop, wherein: the first optical path switch The input end receives a square wave signal, and the output end of the second optical path switch outputs a chirped pulse.

[0018] Such as figure 2 As shown, the single longitudinal mode laser, the first Mach-Zehnder switch, the first Ytterbium-doped fiber amplifier, the second Mach-Zehnder switch, t...

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Abstract

The invention discloses a direct-phase-modulation-based femtosecond wideband pulse generation optical ring in the technical field of wireless communication. The direct-phase-modulation-based femtosecond wideband pulse generation optical ring comprises a first light path switch, an amplifier, a wavelength division multiplexer, a narrowband fiber filter, a second light path switch and two phase modulators which are sequentially connected in series to form a loop, wherein the input end of the first light path receives a square signal; and the output end of the second light path switch outputs chirped pulses. The direct-phase-modulation-based femtosecond wideband pulse generation optical ring can endow generated wideband pulses with linear phases, suppress the production of nonlinear effects in the pulses and filter the light, with the central wavelength of 1,030nm, of the ytterbium-doped fiber amplifier to realize the high signal to noise ratio of a system, and better realizes secondary pulse phase modulation by controlling the external voltage of the phase modulators.

Description

technical field [0001] The invention relates to a method in the technical field of wireless communication, in particular to a femtosecond broadband pulse generation fiber ring based on direct phase modulation. Background technique [0002] At present, there are generally two methods for generating broadband laser pulses in common use. The first is to generate ultrashort pulses through mode-locked lasers, and then use chirped pulse stretching technology to obtain broadband laser pulses. The second is to use the phase modulator to realize the phase modulation of the narrowband pulse, and obtain the broadband laser pulse through the frequency modulation effect. These two methods of generating laser broadband pulses will produce separated spectra in use; and it is necessary to use high-frequency acousto-optic modulators to obtain larger bandwidths. Nonlinear effects often occur in experiments, which affect the stability of the entire system. [0003] After searching the prior...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/365
Inventor 徐剑秋王世伟柳懋卿
Owner SHANGHAI JIAO TONG UNIV
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