Telecom OTDR Test Bare Fiber G652D G657A 20km Coring With
Connectors SC FC LC 20KM
When optical time domain reflectors (OTDR) are used to measure
optical fiber, it is sometimes encountered that the optical fiber
link is short. When measuring short optical fiber link, the bigger
attenuation value (xxdb/km) is often obtained, which makes the
attenuation index unable to obtain a better evaluation. Why?
Because of the short optical fiber link (generally less than 1km),
OTDR measured the curve with certain volatility, which affected the
final numerical calculation. Among the technical parameters
describing OTDR, there is an index about the linearity. The general
index of OTDR is 0.05db/db (e600c:0.05db/db, n3900a:0.03db/db). In
fact, this indicator describes the fluctuation range of OTDR curve.
Therefore, for short fiber, the accuracy of OTDR measurement is
challenged. This problem is also a common problem facing OTDR lock.
So what methods can we reduce this impact? How can we get a better
test result?
1. Add 2km test false fiber
The effect will be reduced as the fiber length is increased due to
the addition of 2km test false fiber. A more satisfactory result
should be available.
But because of the increase of length and the introduction of test
error, this method has some errors brought by the test method. But
as the test data of the project quality, it has a considerable
reference value.
2. Measure link loss with light source and optical power meter, and
measure length with OTDR
The progress of the loss measurement is improved because the
optical power meter measures the link loss close to the standard
loss measurement method by using the light source. Of course, for
the segment fiber, the higher resolution accuracy level of the
optical palace garbage is used to reduce the error. The length
measurement was obtained by OTDR. The attenuation value of unit
length can be obtained by dividing the loss value by the length
value.
3. OTDR measurement curve is only used as reference, and OTDR
measurement focuses on removing link obstacles.
In short fiber measurement, OTDR measurement curve is best used as
a reference, as a qualitative basis, rather than as a quantitative
basis.
Specification of Single mode fiber
| ITEM | Value |
| Mode diameter | (8.6-9.5)±0.7um |
| Cladding diameter | 125±1um |
| Concentricity deviation | ≤0.8um |
| Cladding out of roundness | ≤0.2% |
| Cut off wavelength of optical cable | ≤1260um |
| Macrobending loss 1550nm | ≤0.3dB |
| (37.5mm radius 100 turns) 16xx1nm | ≤0.3dB |
| Screening stress | ≥0.69GPa |
| Zero dispersion wavelength λ | 1300nm≤λ ≤1324nm |
| zero dispersion slope s | ≤0.093ps/um |
| Polarization mode dispersion coefficient of uncalled fiber | ≤xxps(km)1/2 |
| Attenuation number of optical cable | 1300nm≤0.3dB/km ≤0.28dB/km |
| Yyyy nm- - xx dB/km |
| 16xx1nm - ≤0.28dB/km |
| Polarization mode dispersion coefficient of optical cable | M -20 optical fiber segments |
| Q -0.01% |
| PMD-≤0.5ps/(km)1/2 |
Features
- OTDR + bare fiber combination
- Custom interface: SC FC LC ST E2000 MU DIN D4 FDDI SMA, etc
- Bare fiber disc double line fiber
- High transmission speed, low fiber loss, strong anti-interference
ability, high-end material selection, long service life
- Optical fiber can carry 10Mbps, 100Mbps, 1000Mbps high-speed
broadband
- The non-metallic material is used as the conduction cut-off of the
optical fiber, and the electromagnetic interference is not received
- In the communication line, the number of relay stations can be
reduced and the communication quality can be improved
- Each bare fiber has been strictly tested, and all the data meet the
standard before it goes out of the warehouse
