CN2657023Y - Large excess length stainless steel pipe secondary coating optical fiber - Google Patents

Abstract

The utility model relates to the field of communication optical cable and secondary coating of optical fiber, in particular to a stainless steel tube secondary coating optical fiber with an excess length, namely, a stainless steel tube secondary coating optical fiber with the coating structure outside the stainless steel tube and a plastic lining pipe which has S-Z spiralization cycle, variable S-Z spiralization cycle and an eccentric inner hole. The utility model has the advantages that: the fiber excess length is long enough; and the consistency of the excess length and the uniformity of the axial distribution of the optical fiber are good.

Description

The long stainless-steel tube second coating optical fiber in Dayu

Technical field

The utility model relates to communications optical cable and second coating optical fiber field, relates to the long stainless-steel tube second coating optical fiber in a kind of Dayu concretely.The excess fiber length that the utility model is realized is fully big, the stainless-steel tube second coating optical fiber technology of temperature added losses characteristic good, employing during the light unit that is adapted at Optical Fiber composite overhead Ground Wire (OPGW) product of etc.ing of high-performance, the low-cost submarine optical fiber cable that requires and big centre of span beam tube type small bore structure is made.

Background technology

The stainless-steel tube second coating optical fiber has obtained using widely in Optical Fiber composite overhead Ground Wire (OPGW), submarine optical fiber cable and metal self-bearing type (MASS) optical cable owing to have good tensile strength, sealing property and lateral pressure resistant performance.Wherein, the optical cable of the central beam tube type light cellular construction of thin footpathization is because the superiority aspect manufacturing cost and usability especially has been subjected to user's welcome.Under the optical cable elongation situation that set up in big span in order to ensure central beam tube type light unit (stainless-steel tube coated fiber), temperature variation, wind speed, icing or ocean current etc. causes in the light unit optical fibre core be not subjected to stress, need the optical fiber in the stainless-steel tube coated fiber to have enough big surplus length.The manufacture process of general stainless-steel tube second coating optical fiber is: during optical fiber enters by the pipe shape stainless steel band after the shaping roller moulding after tension stringing, S-Z strand, made through operations such as laser bonding, stainless-steel tube drawing sizings by the seam stainless-steel tube coated fiber that has of roller moulding again.Excess fiber length in the stainless-steel tube second coating optical fiber, can be in manufacture process drawing degree during by control optical fiber laying tension and control welded stainless steel pipe obtain.Its manufacturing line and process flow diagram are as shown in Figure 1.The excess fiber length of general stainless-steel tube second coating optical fiber is difficult for accomplishing fully big, and problems such as optical fiber attenuation increase and temperature characterisitic deterioration generally occur under the long situation than the Dayu.

About Dayu long stainless-steel tube second coating optical fiber technology, cause is one of core technology of submarine optical fiber cable and small bore structure OPGW electric power optical cable, countries in the world are all very paid close attention to always for a long time, the research and development that companies such as Germany SIEMENS, French AICATEL, Japanese OCC, China head fly, middle sky all endeavour this technology, but the excess fiber length maximal value that the stainless-steel tube second coating optical fiber of external and domestic other unit reaches at present is 0.8%, should not make the little external diameter optical cable of central beam tube type light cellular construction.

Summary of the invention

The purpose of this utility model is according to above-mentioned the deficiencies in the prior art part, a kind of Dayu long stainless-steel tube second coating optical fiber product is provided, and this product is the stainless-steel tube second coating optical fiber of the outer coating structure of a kind of S-Z of having spiral, variable S-Z spiralization cycle eccentric inner hole plastic inner lining pipe and stainless-steel tube.

The realization of the utility model purpose is finished by following technical scheme:

The long stainless-steel tube second coating optical fiber in Dayu described in the utility model mainly is made of fibre bundle, plastic inner lining pipe, bonding ring, stainless steel coated tube, wherein fibre bundle is the S-Z spiral fashion, optical fiber is in plastic inner lining pipe spiral eccentric inner hole, the endoporus of plastic inner lining pipe is the eccentric shape of S-Z spiral at long axis direction, and the external diameter of plastic inner lining pipe is slightly less than the internal diameter of stainless steel coated tube, and the stainless steel coated tube is at outermost layer.

The utility model has the advantages that: have fully big excess fiber length amount, good excess fiber length consistance and excess fiber length axial distribution homogeneity, promptly realized the maximum surplus of length of optical fiber 〉=1% in minor diameter (being less than or equal to 10mm) stainless-steel tube coated fiber, surplus length is evenly distributed, and fiber optic temperature added losses characteristic good, steady in a long-term reliable, common loss≤0.36db/Km (1310nm wavelength), ≤ 0.25db/Km (1550nm wavelength), fiber optic temperature added losses value≤0.05db/Km is (under the 1550nm wavelength, in-40 ℃ to+80 ℃ scopes), and reaching same therewith loss for prior art, excess fiber length only is 0.4%-0.55% under the situation of temperature added losses characteristic.The present invention can effectively solve submarine optical fiber cable and OPGW in actual use optical cable be subjected to setting up the optical fiber that elongation, temperature variation elongation, wind-force elongation, icing elongation etc. cause and be subjected to problems such as stress, strain.

Summary of drawings

Fig. 1 is a prior art stainless-steel tube second coating optical fiber manufacturing process flow diagram;

Fig. 2 a is the utility model stainless-steel tube second coating optical fiber sectional view;

Fig. 2 b is the utility model stainless-steel tube second coating optical fiber side cutaway view;

Fig. 3 is the utility model stainless-steel tube second coating optical fiber manufacturing process flow diagram;

Fig. 4 is the measurement result of each excess fiber length difference in the excess fiber length amount of the utility model different length stainless-steel tube coated fiber sample and the same stainless-steel tube;

Fig. 5 is the utility model stainless-steel tube second coating optical fiber tensile strength test result;

Fig. 6 is the high low temperature cyclic test of the utility model stainless-steel tube second coating optical fiber result;

Fig. 7 is the long-term heat resistant test result of the utility model stainless-steel tube second coating optical fiber;

Concrete technical scheme

The utility model feature and other correlated characteristic are described in further detail by example below in conjunction with accompanying drawing, so that technician's of the same trade understanding:

Shown in Fig. 1-7, label 1-14 represents respectively: optical fiber (1), S-Z stranded (2), conduit (3), welding (4), traction (5), take-up reel (6), die orifice (7), roller (8), stainless steel band (9), stainless-steel tube (10), gap (11), plastic inner lining pipe (12), bonding ring (13), extruder (14).

The fiber products of present embodiment is provided with plastic inner lining pipe layer (12) in stainless-steel tube (10), the endoporus of plastic inner lining pipe (12) is the eccentric shape of S-Z spiral at long axis direction, its external diameter is slightly less than the internal diameter of stainless steel coated tube (10), fibre bundle (1) is positioned at plastic inner lining pipe (12), also is the S-Z spiral fashion.Long axis direction along plastic inner lining pipe (12), on internal lining pipe (12) outer wall, more than the internal lining pipe endoporus S-Z spiralization cycle of every interval, but be not more than the distance in 50 cycles, its part is bonded as one with stainless steel inside pipe wall, the bonding annulate shaft in this part should be more than or equal to 3mm to width, distance at interval with more than or equal to an internal lining pipe endoporus S-Z spiralization cycle, but no more than 10 such cycles be the best.

Excess fiber length amount, the excess fiber length axial distribution homogeneity that can effectively obtain and control the stainless-steel tube second coating optical fiber being set and preventing bare fibre (1) in stainless-steel tube (10) the inwall commissure flaw damage pipe of plastic inner lining pipe (12).

The present embodiment product is that fibre bundle (1) is also gone into plastic inner lining pipe (12) with the S-Z heave in during fabrication behind tension stringing, thereby obtains excess fiber length once more and keep each excess fiber length consistance.This plastic inner lining pipe adopts core rod S-Z to wave eccentric expressing technique preparation.Along the long axis direction of plastic inner lining pipe, in the internal lining pipe outside, the distance of every interval plastic inner lining pipe orifice S-Z spiralization cycle above (comprising 1 cycle), but be not more than 10 cycles, the annular hot melt adhesive layer of a circle (ring width 〉=3mm) is coated in the part.When stainless steel band (9) through roller (8) moulding, cladding is carried out Laser Welding (LBW) when being connected into stainless-steel tube (10) outside plastic inner lining pipe (12), local plastic internal lining pipe (12) outer wall that scribbles thermosol just is bonded as one with stainless-steel tube (10) inwall.

The present embodiment product in use, in the elastic deformation scope of plastic inner lining pipe (12) material, when lining steel pipe (10) is subjected to tension force or temperature rising etc. and when elongation takes place, increasing while extending to reverse with the S-Z Cycle Length will appear in the part that plastic inner lining pipe (12) is gone up and stainless-steel tube (10) inwall does not bond with S-Z spiral eccentric inner hole, thereby its internal optical fiber (1) is not subjected to ess-strain.Otherwise, remove or temperature decline when tension force, during lining steel pipe (10) retraction, this partly plastic internal lining pipe (12) then also shrinks simultaneously in the elastic properties of materials deformation range, oppositely circles round and S-Z spiralization cycle length resets.

Test of present embodiment properties of product and detection case are as follows:

The 16 core stainless-steel tube second coating optical fibers that are developed into, the stainless-steel tube external diameter is 3.2mm, and internal diameter is 2.8mm, and wall thickness is 0.2mm.The plastic inner lining external diameter of pipe is 2.7mm, and internal diameter is 2.0mm.Adopt intercept method that fibre loss is measured, the average light loss value under the 1310nm wavelength is 0.34db/Km, and the average light loss under the 1550nm wavelength is 0.20db/Km.

Fig. 4 has shown the difference measurement result of each excess fiber length in the excess fiber length amount of stainless-steel tube coated fiber sample of different sample lengths and the same stainless-steel tube.Owing to be provided with the plastic inner lining pipe of the eccentric spiral endoporus of S-Z in the stainless-steel tube, and fibre bundle also adopts S-Z stranded when inserting the plastic inner lining pipe, so stainless steel coated tube inner fiber can be obtained between the long amount in Dayu, each optical fiber the little and excess fiber length of surplus long difference and is evenly distributed vertically.

The above-mentioned stainless-steel tube coated fiber of getting 30M length carries out the tension force stretching test, and the optic path loss of monitoring 16 * 30M welding total length simultaneously changes.Fig. 5 has shown this experimental test result.Because when the stainless-steel tube coated fiber of this S-Z of the having spiral of present embodiment, the plastic inner lining tubular construction of variable S-Z spiralization cycle eccentric inner hole is subjected to tension force stretching, in its elastic deformation scope, can rotate the limit and extend and increase the S-Z spiralization cycle, thereby discharge than common excess fiber length bigger when static by part liner tube edge.Therefore, the tension test detection architecture shows that when the relative tensile elongation of coated fiber reaches 1.2% the fiber transmission attenuation in the coated tube still remains unchanged.

Get the above-mentioned stainless-steel tube coated fiber coiled circle of 200M length, place in the high-low temperature test chamber, carry out-40 ℃-+100 ℃ high low temperature cyclic test and+90 ℃, 400 hours continuous heat resistant test, the optical transmission loss of light path under the 1550nm wavelength of the 16 * 200M of continuous monitoring simultaneously welding total length changes.Fig. 6 and Fig. 7 have shown the loss situation of change of stainless-steel tube coated fiber in thermocycling and heat resistant test respectively.According to the test testing result, the loss changing value of the optical fiber of present embodiment product in thermocycling and heat resistant test confirmed that less than 0.03db/Km above-mentioned stainless-steel tube coated fiber has good temperature-loss variation characteristic.

Claims (5)

1, the long stainless-steel tube second coating optical fiber in a kind of Dayu, mainly comprise and have S-Z spiral fibre bundle, stainless steel coated tube, it is characterized in that also comprising the plastic inner lining pipe, wherein optical fiber is in plastic inner lining pipe spiral eccentric inner hole, the endoporus of plastic inner lining pipe is the eccentric shape of S-Z spiral at long axis direction, and the external diameter of plastic inner lining pipe is less than the internal diameter of stainless steel coated tube.

2, the long stainless-steel tube second coating optical fiber in a kind of Dayu according to claim 1 it is characterized in that endoporus screw pitch (S to spiral or Z to the spiral)≤150mm of described plastic inner lining pipe, and this endoporus is the eccentric inner hole with S-Z spiral.

3, the long stainless-steel tube second coating optical fiber in a kind of Dayu according to claim 1 is characterized in that maintaining the gap between described plastic inner lining external diameter of pipe and the stainless steel coated tube internal diameter.

4, according to the long stainless-steel tube second coating optical fiber of claim 1 or 3 described a kind of Dayus, the gap≤0.15mm that it is characterized in that keeping between described plastic inner lining external diameter of pipe and the stainless steel coated tube internal diameter (is internal lining pipe external diameter and stainless-steel tube internal diameter size difference≤0.30mm).

5, the long stainless-steel tube second coating optical fiber in a kind of Dayu according to claim 1, it is characterized in that described plastic inner lining pipe outer wall and stainless steel inside pipe wall at long axis direction more than the S-Z spiralization cycle of the spiral eccentric inner hole of a plastic inner lining pipe, but be not more than 50 cycles (the S-Z spiralization cycle that comprises a spiral eccentric inner hole) distance, the place that forever interfixes is promptly arranged.

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