Loss of fiber used and the countermeasures – optical transmission – Radio and TV Industry

Article by jekky









(648, ‘Fiber transmission loss characteristics is to determine the optical transmission distance transmission stability and reliability of one of the most important factors Production of optical fiber transmission loss are many reasons the optical fiber Communicate Network construction and maintenance the most noteworthy is the optical transmission loss caused by the use of reason and how to reduce these losses Optical fiber transmission loss caused by the use of main splice loss intrinsic fiber loss splice loss and activities of the joint loss and non consecutive loss bending loss and other construction factors and application of the loss caused to the environment categories br br 1 splice loss and its solution br 1 1 Connection Loss Fiber splice loss br include fiber optic intrinsic factors inherent loss and extrinsic factors in the splicing loss and the loss of three kinds of joint activities br br 1 the inherent loss optical fiber mode field diameter of main stems from inconsistent fiber core diameter mismatch core is non circular cross section fiber core and cladding concentricity bad 4 00 the most influential is the mode field diameter inconsistent br br 2 loss of fusion welding of non intrinsic factors mainly by the loss of axial dislocation axis knuckle tilt face separation gap fiber end face is not complete refractive index difference dirty fiber end and continue staff operational level the steps Welding machine Electrode cleanliness weld parameter settings work environment cleanliness and other factors br br 3 loss of joint activities in the activities of non intrinsic factors in joint activities connector loss mainly of poor quality poor contact dirty and the same with the loss of fusion factors such as axial dislocation end clearance knuckle refraction poor rate cause br br 1 2 solution splice loss program br 1 engineering design construction and maintenance work should use the same high quality optical characteristics of a line as far as possible the same batch of high quality brand name bare fiber as far as possible in order to match the characteristics of optical fiber so that the mode field diameter of optical fiber fusion minimize the impact of loss br br 2 Cable Construction shall be in strict accordance with procedures and requirements br Disc as far as possible with the entire disk configuration single disk 500 m to minimize the number of joints When installed in strict accordance with plate number and the end of another cable laying order to minimize loss of value br br 3 selection of trained and experienced staff continue and continue Test br Follow the level of staff directly affected the size of splice loss optical fiber connecting personnel should be strictly in accordance with the welding process to follow strictly control the joint loss welding process using the optical time domain reflectometer OTDR monitoring splice loss 0 08 dB a does not meet the requirements should be re welding Use Optical Time Domain Reflectometer OTDR the joint measurement of two directions from the loss and calculated the average of the two results one way OTDR measurement to eliminate the human factor error br br 4 ensure environmental compliance requirements continue br Prohibited in dusty and humid environments open operation Cable Connecting parts and tools materials should be kept clean damp not allow optical fiber connector optical fiber must be prepared to cut clean not a dirt After the fiber cut not to long time exposure to air especially in dusty and humid environments Follow the ambient temperature is too low the temperature should take the necessary measures br br 5 preparation of perfect fiber end face br br Optical fiber end preparation is the most critical processes continue Improvement of fiber end face is to decide whether or not optical fiber splice loss of important reasons High quality face should be flat no burr no defect and with the axis perpendicular to the axis of the fiber end should be less than 0 3 degree angle showing a smooth mirror and kept clean to avoid dust pollution ‘)




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