A wavelength stabilization system for tunable dwdm wavelength optical nodes
A technology for stabilizing systems and optical nodes, applied in wavelength division multiplexing systems, optical multiplexing systems, electrical components, etc., can solve problems such as reduction and unsatisfactory wavelength stability, and achieve strong market competitiveness and market prospects Good results
Active Publication Date: 2020-08-25
浙江省广电科技股份有限公司
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Problems solved by technology
[0003] In order to overcome the deficiencies in the prior art, that is, in view of the fact that the wavelength stability is not ideal when the current refrigerator is installed externally, the present invention provides an OBI (Optical Beat Frequency Interference) that can effectively solve the two-way HFC network return channel. ) noise problem, while reducing the cost of the wavelength stabilization method of the tunable DWDM wavelength optical node, by building the semiconductor cooler and thermistor of the coaxial TOSA laser, and controlling the wavelength of the output optical signal through the relevant control circuit and software Accuracy, wavelength stability can reach 0.001nm high precision
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[0033] The present invention will be further described below in conjunction with specific examples, but the present invention is not limited to these specific implementations. Those skilled in the art will realize that the present invention covers all alternatives, modifications and equivalents as may be included within the scope of the claims.
[0034] see figure 1 , a wavelength stabilization technology for a tunable DWDM wavelength optical node, applied to a wavelength-tuned RFoG optical node, installed at a user end, including a wavelength selective switch 1, the wavelength selective switch 1 is connected to a microprocessor 2, and the microprocessor The processor 2 controls the digital-to-analog conversion circuit 3 according to the DWDM wavelength selected by the wavelength selection switch 1. The digital-to-analog conversion circuit 3 is connected to a precision op-amp circuit 4 to amplify the analog signal. The precision op-amp circuit 4 is connected to a refrigeration...
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The invention discloses a wavelength stabilization system of a tunable DWDM wavelength optical node, and the system comprises a wavelength selection switch and a laser tube control circuit. The lasertube control circuit is connected with a laser tube. The wavelength selection switch is connected with microprocessor, the microprocessor is connected with a digital-to-analog conversion circuit whichis controlled according to the DWDM wavelength selected by the wavelength selection switch, and a thermistor which is used for collecting the temperature of the laser tube. The thermistor is arrangedin the laser and is in contact with the laser tube. The thermistor and the digital-to-analog conversion circuit are connected with a precision operational amplifier circuit for comparing the samplingvoltage with the analog voltage. The precision operational amplifier circuit is connected with the refrigerator control circuit. The refrigerator control circuit is connected with the semiconductor refrigerator. The semiconductor cooler is arranged in the laser and makes contact with the laser tube, and the cooler control circuit controls the power supply current and the power supply direction according to the comparison result of the precise operational amplifier circuit to enable the semiconductor cooler to conduct heating or cooling work, so that the temperature of the laser tube of the laser is stabilized at a set value.
Description
technical field [0001] The invention belongs to the field of limited television, and in particular relates to a wavelength stabilization system for tunable DWDM wavelength optical nodes. Background technique [0002] With the increasing demand for network bandwidth, the number of optical nodes used in the network has increased dramatically. In order to eliminate optical beat interference (OBI), Dense Wavelength Division Multiplexing (DWDM) technology can be used. The wavelength design of the optical node backhaul optical signal It is tunable and adopts optical nodes with different backhaul optical wavelengths to solve the OBI noise problem. At present, more coaxial TOSA lasers and external electronic coolers and thermistors are used, and operational amplifier circuits are used to control the electronic cooler to realize the laser output wavelength tuning function. However, the effect of this solution is not ideal, the stability of the output optical signal wavelength is not...
Claims
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IPC IPC(8): H04J14/02
CPCH04J14/0201H04J14/0213
Inventor 程伟王玩球泮美丽张琴王丹君
Owner 浙江省广电科技股份有限公司