Power control device of multi-pumping raman optical fiber amplifier

Abstract

The invention relates to a power monitoring device of a multi-pumping raman optical fiber amplifier. The power control device comprises a pumping / signal combiner, a power monitoring module, a multi-pumping laser array module and a control module. The pumping / signal combiner is arranged on a main optical path, wherein the power monitoring module, the multi-pumping laser array module and the control module are arranged on an auxiliary optical path, pumping light output by the multi-pumping laser array module passes through the power monitoring module and is combined in a transmission optical fiber through signal light input by the pumping / signal combiner and the main optical path so as to output the signal light after amplified through the stimulated raman scattering effect of the optical fibers, the power monitoring module feeds back the monitored pumping light power to the control module, and the control module achieves amplified output control on the signal light by controlling the power of the pumping light output by the pumping lasers in the multi-pumping laser array module according to the monitored power of the pumping light. The power monitoring device does not need to use a high-cost polarization maintaining type optical splitter to separately monitor the power of each pumping, can reduce the cost of a system device and reduces insertion loss of an optical path.

Description

technical field [0001] The invention relates to the field of optical transmission, in particular to a multi-pump Raman fiber amplifier power control device. Background technique [0002] The Raman fiber amplifier uses the nonlinear optical effect of the fiber itself - stimulated Raman scattering (SRS), to directly amplify the optical signal. Silica fiber has a wide stimulated Raman scattering gain spectrum and a broad main peak around 13THz. Therefore, the working band of the Raman fiber amplifier mainly depends on the wavelength of the pump light. In theory, as long as there is a suitable Raman pump source, the signal of any wavelength in the fiber can be amplified. For example, if the pump light with a wavelength of 1450nm is injected into the fiber, optical gain can be obtained in the 1550nm band. Therefore, how to monitor the power of each pump light while reasonably selecting the wavelengths of multiple pump lights, so as to realize the gain requirement of the system b...

AI Technical Summary

Problems solved by technology

However, this method of configuring a beam splitter and a detector at each pump laser will inevitably increase the cost of system equipment, especially when the pump wavelength is the same and a polarization beam combiner is required, it is even more necessary to use a polarization The maintenance type optical splitter increases the cost even more. In addition, due to the long optical path between the detector and the main optical path, it is easy to cause the increase and change of the insertion loss of the optical path, which affects the accuracy of the detected pump light power, and the final control is not handled properly.

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