The TruePhase 1550 Polarization-Maintaining Optical Fibers are optimized for operation in the 1550 nm band which is of interest for usage with premium photonic devices such as phase-sensitive Lithium Niobate Modulators, with Silicon Photonics and as the output fiber in 1550 nm source lasers.

The TruePhase 1550 is available in 2 versions with respect to Optical Birefringence. The standard option (HBL – High Beat Length) is specified with a Beat Length of 3.7 mm – 4.7 mm @ 1550 nm, while the Low Beat Length (LBL) version has a Beat Length < 4.2 mm @ 1550 nm.

The standard option is available with coating having a diameter of 250 µm and 400 µm respectively, both proof tested to 200 kpsi. The improved version can be supplied with a 250 µm or 400 µm coating proof tested to 100 and 200 kpsi respectively.

Unit of Measure

Optical Properties


N/A Polarization-Maintaining

Operating Wavelength

N/A 1550 nm

Cutoff Wavelength

N/A ≤ 1470 nm

Mode Field Diameter

N/A @ 1550 nm, 10.5 ± 1.0 µm


N/A @ 1550 nm, ≤ 1 dB/km

Beat Length

N/A @ 1550 nm, ≤ 4.5 mm


N/A @ 1550 nm/100 m, ≤ -30 dB

Crosstalk (Typical)

N/A @ 1550 nm/100 m, ≤ -35 dB

Numerical Aperture

N/A 0.13

Dimensions/Geometric Properties

Cladding Diameter

N/A 125 ± 1 µm

Coating Diameter

N/A 250 ± 10 µm

Coating Type

N/A Dual UV Acrylate

Core/Clad Offset

N/A ≤ 0.5 µm

Clad Non-Circularity

N/A ≤ 2.0%

Mechanical and Testing Data

Operating Temperature

N/A -40 to +85 ºC

Proof Test Level

N/A ≥ 100 kpsi0.689 GPa

How To Order:

Order From Location

1.888.438.9936 toll-free in the United States and Canada
1.860.678.0371 from outside the U.S.A.
55 Darling Drive
Avon, CT 06001, USA

Order By Item #

N/A BF06734-01

Applications For Any And/Or All Of These Products

N/A Laser Pigtails Lithium Niobate and Other External Modulators Other Polarization-Sensitive Components PMD Compensators Polarizing Beam Splitters


N/A Cabling Coating Material and Dimensions Metalization Optical Properties Proof Test