CN2543027Y

CN2543027Y - Optical fibre all-purpose tester

Info

Publication number: CN2543027Y
Application number: CN 02217789
Authority: CN
Inventors: 陆润华; 沈国勋; 江斌; 涂建坤
Original assignee: Shanghai Secri Optical Cable Co ltd
Current assignee: Shanghai Secri Optical Cable Co ltd
Priority date: 2002-05-30
Filing date: 2002-05-30
Publication date: 2003-04-02
Anticipated expiration: 2012-05-30

Abstract

An optical fiber synthesized tester comprises a light source, a monochromator, an optical injection system, a probe system, a phase locking amplifier, a data acquisition and a computer, and is characterized in that the probe system is composed of a diaphragm plate, a lens, a probe and a stepping motor, wherein a series of diaphragm holes with different apertures are evenly arranged on the circumference of the diaphragm plate; following conditions should be supplied for the lens: (1) the focus of the lens is constant and an excellent imaging quality is possessed in a spectrum range of 1.0 Mum-1.7Mum; (2) the limiting aperture is Phi 32mm; (3) the numerical aperture NA is bigger than 0.30; (4) the transmission is over 98%; when the diaphragm plate is driven by the stepping motor to rotate, an incident main beam will orderly pass through each diaphragm hole on the diaphragm plate; the beam passing through the diaphragm hole is syntaxis to a probing plane of the probe positioned on a lens focal plane, after being focalized by the lens.

Description

The optical fiber comprehensive tester

Technical field:

The utility model is relevant with the test of telecommunication optical fiber, and particularly a kind of optical fiber parameter that is used for comprises the architecture advances of the optical fiber comprehensive tester that fibre loss, cutoff wavelength and mode field diameter are measured.

Background technology:

P.K company, EG﹠amp are adopted in existing fibre loss, cutoff wavelength and mode field diameter test; The optical fiber parameter tester of G company, its optical schematic diagram as shown in Figure 1, the optical fiber parameter tester is gone into system 1, main detector 3, lock-in amplifier 4, data acquisition 5 and computing machine 6 by light source, monochromator and light beam and is constituted, be contained in the mainframe box, be used to measure loss and cutoff wavelength, set up a mode field diameter test accessories 3 ' in addition, this annex is made of apertured plate, lens and detector, is used for mode field diameter and measures.

This shows that also there is weak point in existing optical fiber parameter tester:

1, instrument should be joined the detector of main frame, joins the mode field diameter test accessories again, and structure repeats, inevitable cost height;

2, optical fiber is carried out the mode field diameter test and must carry out conversion, promptly test, use mode field diameter test accessories 3 ' then instead optical fiber is carried out mode field diameter test, the loaded down with trivial details inconvenience of test process with 3 pairs of fibre losses of main detector and cutoff wavelength to detector;

Summary of the invention:

The technical problems to be solved in the utility model is to overcome above-mentioned the deficiencies in the prior art, detector is improved, a kind of optical fiber comprehensive tester is provided, this comprehensive tester is without the mode field diameter test accessories, and can finish the measurement of loss, cutoff wavelength and the mode field diameter of optical fiber by a detector system, and whole instrument forms a unified integral body, and the instrument volume is little, cost reduces, and is easy to use during test.

The technical solution of the utility model optical fiber comprehensive tester is:

A kind of optical fiber comprehensive tester, going into system, detector system, lock-in amplifier, data acquisition and computing machine by light source monochromator and light beam constitutes, it is characterized in that said detector system is made of apertured plate, lens, detector and step motor, said apertured plate is the disk that is provided with the different aperture in a series of apertures on the circumference equably; Said lens should satisfy following condition:

. in spectral range was 1.0 μ m～1.7 μ m, the focal length of lens was constant, has good image quality;

. clear aperature is Φ 32mm;

. numerical aperture NA＞0.30;

. transmitance＞98%;

When step motor drove the apertured plate rotation, the main beam of incident will be successively by each aperture on the apertured plate, and the light beam by aperture is through converging to after the lens focus on the detector detection plane that is positioned at lens focal plane.

Technique effect of the present invention is:

1. adopt this device,, can measure the mode field diameter of the single-mode fiber that comprises G652, G655 by the variable aperture method of GB mode field diameter test;

2. adopt apertured plate φ 20 holes, its numerical aperture reaches 0.274, loss that can measuring optical fiber;

3. experiment effect proves, the utility model had both dwindled volume, provides cost savings, and has guaranteed quality again, and easy to use reliable;

4. this device to test result is correct.

Description of drawings:

Fig. 1 is an existing fiber parameter tester optical schematic diagram.

Fig. 2 is the utility model optical fiber comprehensive tester optical schematic diagram.

Fig. 3 is the utility model detector system light channel structure synoptic diagram.

Fig. 4 is the utility model apertured plate structure most preferred embodiment synoptic diagram.Among the figure:

1-light source, monochromator and light beam are gone into system's 2-optical fiber

21-optic fibre input end, 22-fiber-optic output, 3-detector system

3 '-detector annex, 31-apertured plate, 32-lens

33-detector, 34-step motor, 4-lock-in amplifier

5-data acquisition, 6-computing machine 1. 2. 3.

Aperture

Embodiment:

See also Fig. 2, Fig. 3 and Fig. 4.As seen from the figure, the utility model optical fiber comprehensive tester is by light source, monochromator and light beam are gone into system 1, detector system 3, lock-in amplifier 4, data acquisition 5 and computing machine 6 constitute, said detector system 3 as shown in Figure 3, by apertured plate 31, lens 32, detector 33 and step motor 34 constitute, lens 32 are between fiber-optic output 22 and detector 33, the light that is sent by fiber-optic output 22 is after lens 32 focus on, converge on the detection plane of detector 33, this detection plane promptly is positioned at the focal plane of lens 32, the optical parametric of these lens 32 is as follows: in spectral range is 1.0 μ m～1.7 μ m, the focal length of lens is constant, has good image quality; Clear aperature is φ 32mm, numerical aperture NA＞0.30; Transmitance＞98%.Fig. 4 is the utility model apertured plate structure most preferred embodiment synoptic diagram, and the external diameter of this apertured plate 31 is φ 200mm, has 19 apertures, and with 18 ° of interval circle distribution, its diameter and corresponding numerical aperture are as shown in the table respectively.

Hole number	1	2	3	4	5	6	7	8	9	10
Hole number	1	2	3	4	5	6	7	8	9	10	Aperture (mm)	20	14.4	13.4	12.4	11.4	10.4	9.6	8.8	8	7.2
Numerical aperture	0.274	0.201	0.198	0.174	0.161	0.147	0.136	0.125	0.114	0.102	Aperture (mm)	20	14.4	13.4	12.4	11.4	10.4	9.6	8.8	8	7.2
Numerical aperture	0.274	0.201	0.198	0.174	0.161	0.147	0.136	0.125	0.114	0.102	Hole number	11	12	13	14	15	16	17	18	19
Aperture (mm)	6.4	5.7	5.0	4.3	3.6	2.9	2.2	1.6	1.0		Hole number	11	12	13	14	15	16	17	18	19
Aperture (mm)	6.4	5.7	5.0	4.3	3.6	2.9	2.2	1.6	1.0		Numerical aperture	0.091	0.081	0.071	0.061	0.051	0.041	0.031	0.023	0.014

The test request of G652 optical fiber has not only been satisfied in this design, and can satisfy the large effective area of G655 optical fiber and the test request of large-numerical aperture.

The optical fiber parameter test process is as follows:

1, with testing fiber 2 by in anchor clamps (among the figure draw) instrument of packing into, and meticulous adjustment, the required monochromatic light injection fibre 2 that light source and monochromator are sent, the emergent light of optical fiber 2 converges to detector 33 receptions by the aperture of apertured plate 31 after lens 32 focus on, light signal amplifies through lock-in amplifier 4, gathered and handled by data acquisition system (DAS) 5 and computing machine 6 then, end product can be presented on the video screen or by printer output.

2, by step motor 34, drive apertured plate 31 rotations, when the aperture of maximum when 1. φ 20 borehole jacks are lived light beam, because at this moment the aperture of φ 20mm is greater than the beam diameter (aperture is not in the light) that sends from optical fiber 2 output terminals 22, and the transmitance of lens 32＞98%, therefore can be used for measuring optical fiber loss and cutoff wavelength;

3, be further rotated when step motor 34 drives apertured plate 31, make the emergent light of fiber-optic output 22 pass through aperture 2., 3., 4. respectively

Can obtain the data of fibre-optic mode field diameter.

The utility model proves to have following technique effect after tested:

1. adopt this device,, can measure the mode field diameter of the single-mode fiber that comprises G652, G655 by the variable aperture method of GB mode field diameter test.

2. adopt apertured plate φ 20 holes, its numerical aperture reaches 0.274, loss and cutoff wavelength that can measuring optical fiber.

3. the utility model is easy to be reliable, has both dwindled volume, provides cost savings, and has guaranteed quality again.

Claims

1, a kind of optical fiber comprehensive tester, going into system (1), detector system (3), lock-in amplifier (4), data acquisition (5) and computing machine (6) by light source, monochromator and light beam constitutes, it is characterized in that said detector system (3) is made of apertured plate (31), lens (32), detector (33) and step motor (34), is provided with the different aperture in a series of apertures equably on the circumference of said apertured plate (31); Said lens (32) should satisfy following condition:

. in spectral range, i.e. 1.0 μ m～1.7 μ m, the focal length of lens is constant, has good image quality;

. clear aperature is Φ 32mm;

. numerical aperture NA＞0.30;

. transmitance＞98%;

When step motor (34) drives apertured plate (31) rotation, the main beam of incident will pass through apertured plate (31) successively and go up each aperture, and the light beam by aperture converges on the detection plane of the detector (33) that is positioned at lens (32) focal plane after lens (32) focus on.

2, optical fiber comprehensive tester according to claim 1 is characterized in that the aperture of said apertured plate (31) has 19, and its aperture and corresponding numerical aperture are followed successively by: Hole number 1 2 3 4 5 6 7 8 9 10 Aperture (mm) 20 14.4 13.4 12.4 11.4 10.4 9.6 8.8 8 7.2 Numerical aperture 0.274 0.201 0.198 0.174 0.161 0.147 0.136 0.125 0.114 0.102 Hole number 11 12 13 14 15 16 17 18 19 Aperture (mm) 6.4 5.7 5.0 4.3 3.6 2.9 2.2 1.6 1.0 Numerical aperture 0.091 0.081 0.071 0.061 0.051 0.041 0.031 0.023 0.014