Polarization-Maintaining PM-ESF-7/125 panda-type
polarization-maintaining erbium-doped fiber.
"Polarization-Maintaining PM-ESF-7/125" refers to a panda-type
polarization-maintaining erbium-doped fiber.
Structure and Principle
Polarization-Maintaining Principle: PM-ESF-7/125 belongs to
panda-type polarization-maintaining fibers, which have two
symmetrical stress regions. By introducing stress into the fiber,
the two orthogonal polarization modes in the fiber have different
propagation constants, thus achieving the function of polarization
maintenance, reducing polarization mode dispersion, and ensuring
that the polarization state of the light wave remains basically
unchanged during transmission.
Doping Characteristics: This fiber is an erbium-doped fiber with a
high erbium ion doping concentration. The peak absorption at 1530nm
can reach 55dB/m, which can effectively realize functions such as
optical signal amplification.
Performance Parameters Optical Parameters
Mode: Single-mode fiber, ensuring that optical signals are
transmitted in a single mode, reducing mode dispersion and
improving signal quality.
Birefringence: The birefringence value is ≥3.5×10⁻⁴. High
birefringence enables the fiber to better maintain the polarization
state of light.
Polarization Crosstalk: At the wavelength of 1300nm, the
polarization crosstalk is < -35dB/4m, indicating that the fiber
has a high isolation degree between different polarization modes,
reducing the impact of crosstalk on the signal.
Second-Order Mode Cut-off Wavelength:
It is 1460±60nm, ensuring that the fiber can maintain single-mode
transmission within the working wavelength range.
Dimension Parameters
Core Diameter: 7.4 microns.
A smaller core diameter helps to restrict light transmission in the
core and improve the interaction efficiency between light and doped
ions in the core.
First Cladding Diameter: 125 microns, providing optical confinement
for the core to enable efficient light transmission in the core.
Coating Diameter: 245 microns. The coating can protect the fiber
from the external environment and improve the mechanical strength
and service life of the fiber.
Other Parameters
Working Wavelength Range: 1530-1625nm.
Within this wavelength range, the fiber can achieve good optical
performance, suitable for various applications such as optical
communication and optical sensing.
Numerical Aperture: 0.15. The numerical aperture determines the
ability of the fiber to collect and transmit light, and this value
allows the fiber to be well coupled with other optical devices.
Proof Test Level: 100kpsi (0.7GPa), indicating that the fiber has
high mechanical strength and can withstand certain tensile and
compressive forces.
Characteristics
High Conversion Efficiency: Due to high erbium ion doping and
unique technical design, it has high pump conversion efficiency,
which can effectively convert pump light into signal light and
improve the performance of optical amplifiers and other devices.
Excellent Polarization Characteristics:
As a polarization-maintaining fiber, it can well maintain the
polarization state of light, providing stable polarization output
for applications requiring polarized light.
Good Beam Quality: It can achieve laser output with narrow
linewidth and high beam quality, suitable for application scenarios
with high requirements for beam quality, such as laser processing
and laser ranging.
High Reliability:
Adopting NuCoat FA™ coating technology, it has good
anti-environmental interference ability,
can work stably for a long time in extreme environments, and
improves the reliability and service life of the fiber.
We also offer specialized PM fibers. Our photosensitive fiber can
be exposed to UV light to create a Fiber Bragg Grating, our
dispersion-compensating fiber corrects for chromatic dispersion,
and our bend- and temperature-insensitive PM fiber is ideal for use
in fiber optic gyroscopes (FOG).
PANDA PM Fibers Features:
Extremely high birefringence
Excellent polarization maintaining properties
Low attenuation
Single-mode designs from 400 nm – 1550 nm
Dual-layer UV acrylate and 900 µm nylon
Silicone coatings available
Low sensitivity to bending-induced attenuation
Low splice loss
PANDA PM Fibers available:
- High Numerical Aperture
- Reduced claddings
- Low birefringence
- Erbium-doped
- Dispersion shifted
- Polyimide and flame retardant coatings are also available
Fibre Type
PM 980
PM 1310
PM 14xx
PM 1550
125-12/250_C
125-13/250_C
125-13/250_C
125-13/250_C
PM1015-A+ | PM1016-C+ | PM1018-A+ | PM1017-C+ |
Optical Properties |
Operating Wavelength (nm) | 980 | 1310 | 1400 - 1490 | 1550 |
Cut-o Wavelength (nm) | 800 - 970 | 1100 - 1290 | 1200 - 1380 | 1290 - 1520 |
Mode Field Diameter (μm) | 6.5±1.0 | 9.0±1.0 | 9.8±1.0 | 10.5±1.0 |
Attenuation (dB/km) | ≤ 2.5 | ≤ 0.5 | ≤ 0.5 | ≤ 0.5 |
Beat Length (mm) | 3.0 - 5.0 | 3.0 - 6.0 | 4.0 - 7.5 | 4.5 - 8.0 |
Typical Cross Talk at 4m (dB) | ≤-30 | ≤-30 | ≤-30 | ≤-30 |
Cross Talk at 1000m (dB) | ≤-25 | ≤-25 | ≤-25 | ≤-25 |
Geometrical Properties |
Cladding Diameter (μm) | 124.5 ± 1.0 | 124.5 ± 1.0 | 124.5 ± 1.0 | 124.5 ± 1.0 |
Coating Diameter (μm) | 245.0 ± 7.0 | 245.0 ± 7.0 | 245.0 ± 7.0 | 245.0 ± 7.0 |
Cladding Non-Circularity (%) | ≤1.0 | ≤1.0 | ≤1.0 | ≤1.0 |
Core Concentricity Error (μm) | ≤0.5 | ≤0.5 | ≤0.5 | ≤0.5 |
Coating Type | Dual-layer, UV-acrylate | Dual-layer, UV-acrylate | Dual-layer, UV-acrylate | Dual-layer, UV-acrylate |
Mechanical Properties |
Operating Temperature (℃) | -45 to +85 | -45 to +85 | -45 to +85 | -45 to +85 |
Proof Test (100 kpsi) | 100 | 100 | 100 | 100 |
