Wavelength tunable RFoG optical node
A technology of wavelength tuning and optical nodes, which is applied to the structure of optical resonators, lasers, laser components, etc., can solve the problem of low cost and achieve the effect of cost reduction
Pending Publication Date: 2017-11-24
浙江省广电科技股份有限公司
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[0003] The invention proposes a wavelength-tuned RFoG optical node with low cost and effectively solving the OBI noise problem of the bidirectional HFC network
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[0021] 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.
[0022] see figure 1 , a wavelength-tuned RFoG optical node, which is installed at the user end, and includes a semiconductor laser 1, a temperature detection circuit 2 for detecting its temperature is connected to the semiconductor laser 1, and the temperature detection circuit 2 is connected with the detection according to its output The single-chip microcomputer 4 of value output control signal is connected, is connected with analog-to-digital conversion circuit 3 between described temperature detection circuit 2 and single-chip microcomputer 4, and described single-chip microcomputer 4 is connected with the current drive circuit 5 ...
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The invention relates to a wavelength tunable RFoG optical node. The wavelength tunable RFoG optical node is installed on a user side, and comprises a semiconductor laser; a temperature detection circuit for detecting the temperature of the semiconductor laser is connected onto the semiconductor laser; the temperature detection circuit is connected with a single chip microcomputer for outputting a control signal according to a detection value output by the temperature detection circuit; the single chip microcomputer is connected with a current driving circuit controlled by the single chip microcomputer; the current driving circuit is connected with a semiconductor refrigeration sheet, the power supply current magnitude and the power supply direction of which are controlled by the current driving circuit; and the semiconductor refrigeration sheet is connected with the semiconductor laser, the output optical signal wavelength of which is controlled and adjusted by the semiconductor refrigeration sheet. The semiconductor laser in the invention is a commonly used BOSA optical device; only an LD semiconductor laser tube is encapsulated; the cost is reduced; the use range is wide; furthermore, the temperature detection circuit and the semiconductor refrigeration sheet are increased; therefore, the tuning function of the LD optical wavelength of the DFB laser in the BOSA is realized; and thus, the OBI noise problem of a bidirectional HFC network can be solved.
Description
technical field [0001] The invention belongs to the field of cable television and relates to a wavelength-tuned RFoG optical node. Background technique [0002] RFoG optical node is an important transmission equipment in CATV two-way HFC network. Due to its advantages of shielding backhaul aggregation noise and optimizing network structure, it is more and more widely used in CMTS (cable modem termination system). However, with the continuous extension of the optical fiber network to the user end, the number of optical nodes has increased dramatically. If the return channel has the same optical wavelength access, OBI (Optical Beat Frequency Interference) noise will occur. At present, optical nodes with different backhaul optical wavelengths are used to solve the OBI noise problem. For example, a cable TV access network system for reducing optical beat frequency noise disclosed in Patent No. 201420621277, including downlink optical transmitters, uplink optical receivers, An o...
Claims
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IPC IPC(8): H01S5/024H01S5/042H01S5/12
CPCH01S5/02415H01S5/042H01S5/12
Inventor 程伟王玩球陆群张速飞
Owner 浙江省广电科技股份有限公司