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SPUN-R Fiber Description and Polarization State Evolution
Features
  • Low Insertion Loss
  • Temperature Insensitive
  • Precise Spinning Pitch
  • High Current Sensitivity
  • No Required for Quarter Wave Plate
Applications
  • Current Sensors
  • Lightening Sensor
  • Polarization Controller
  • Polarization transformers

The controllably-spun birefringent-fiber or all fiber polarization transformer consists essentially of a long spun high-birefringence fiber, fabricated by slowly varying the spin rate of a birefringent fiber preform from very slow to very fast while the fiber is being drawn. The evolution of the eigenstate from a linear polarization state to an elliptical polarization state, induced by slow variation of the intrinsic structure from linear anisotropy at the unspun to elliptical anisotropy at the fast-spun of the other end, enables power coupling between local eigenstates, and relative power in these local eigenstates as a function of distance along the length of the fiber, the extinction ratio of the output state of polarization (SOP) as a function of distance and the normalized spin rate.

Features
  • Low Insertion Loss
  • Temperature Insensitive
  • Precise Spinning Pitch
  • High Current Sensitivity
  • No Requirement for Quarter Wave Plate
Applications
  • Current Sensors
  • Lightening Sensor
  • Polarization Controller
  • Polarization transformers
Specifications
Parameters Unit Performance
Operating Wavelength nm 1310, 1480, 1550
Bandwidth nm ±30
Pitch Length at Un-Spun End mm
Pitch Length at Fast Spun End mm 3.2
Insertion Loss Max dB/m 0.1
Insertion Loss Typ dB/m 0.06
Modal Field Diameter Typ μm 9.0±0.5
Bending Radii Min mm 75
Operating Temperature °C -40 to +85
Temperature Characteristics (E-core Fiber)
Temperature Characteristics (PANDA Fiber)
Diagram
Ordering Information
S
P
U
N
R
1
0

Wavelength

4=1550nm
5=1480nm
7=1310nm
S=Specify

Fiber Type

P=Panda Fiber
E=E-core Fiber

Jacket Type

M=0.9mmloose tube
L=3mm cable

Fiber Length

1=1.0m
2=2.0m
3=3.0m
...
9=9.0m
0=10.0m

Connector at Port1

0=None
1=FC/PC
2=FC/UPC
3=FC/APC

Connector at Port2

4=Mirror