Un-doped double clad fibers DC-200/40-PZ-Si0 pages

Crystal Fibre ● aeroLASE ● Koheras ● SuperK

DC-200/40-PZ-Si

Large
Mode-area

Single
Mode

Polarization
Maintaining

Single-mode, polarizing double-clad fiber with large mode area
Single mode, single polarization
Large mode area
High NA circular pump core
Coil Control ensuring excellent stability
The DC-200/40-PZ-Si is a passive (undoped), large mode area,
single mode core embedded in a high NA multimode fiber structure. This fiber is substantially similar to our DC-200/40-PZ-Yb
active Yb-doped fiber, but with a pure silica core, and can be
used to optimize procedures that will be used with the active
version.
The inner cladding has a high numerical aperture (NA) due to
the large index step between the air hole ring and silica. Microstructuring of the inner cladding allows a large mode field diameter while still maintaining a superior beam quality. The allsilica fiber sustains high power levels. It features a mode area
of more than 700 µm2 while keeping single-mode beam quality.
Moreover, the fiber is polarizing resulting in improved PER compared to normal polarization-maintaining fibers.
The fiber can also be used in applications requiring singlemode beam propagation in one direction and at the same time
collection and propagation of scattered light or luminescence in
the other direction for detection.
The fiber is available with sealed ends or with end-caps and
high power SMA connectors.

Left: Optical microscope picture of the core region. Right: Near field
measured at 1060 nm.

Physical properties
Signal core diameter
Inner cladding diameter, ID
Outer cladding diameter, OD
Coating diameter
Core, outer and inner cladding material
Coating material, single layer

40± 2 µm
200± 5 µm
450± 20µm
540± 30 µm
Pure silica
HT acrylate

Coil Control
The DC-200/40-PZ-Si features Coil Control, ensuring that the
fiber always coils in the correct plane for superior mode stability and easy use. We recommend a bending diameter in the 2540 cm range. Best PER is obtained when operating the fiber in
the slow axis. Note that degradation of the PER and efficiency
can occur if the fiber is forced to coil in a different plane or
twisted in the coil.

Applications
- Optimization of cleaving, splicing, and coupling techniques
to be used with the active fiber version
- Single mode pulse delivery with collection of light from a
broad angle

Optical properties
Signal core
Mode properties
M2 @ 1060 nm
Mode field diameter
Mode field area
NA @ 1060 nm

Single mode
< 1.3
30 ± 2 µm
700±100 m2
~ 0.03
The single-mode advantage

Multimode pump core
Numerical aperture @ 950 nm
Polarization Parameters
Birefringence n
Polarization Extinction Ratio

0.55 ± 0.05

1·10-4
> 15 dB

All our double-clad fibers in the Crystal Fibre range are strictly single-mode
leading to several advantages compared to standard multimode LMA fibers:
- Better output stability
- Highest possible beam quality
- No requirements on tight coiling
- No coiling-induced mode area compression

Covered by U.S. Patents 5907652, 6334019, 6603912, 6888992

NKT Photonics A/S (Headquarters)
Blokken 84 ● 3460 Birkerød ● Denmark
Phone: +45 4348 3900
Fax:
+45 4348 3901
www.nktphotonics.com

NKT Photonics GmbH
Schanzenstrasse 39 ● Bldg D9-D13
51063 Cologne ● Germany
Phone: +49 221 99511-0
Fax:
+49 221 99511-650

DC-200-40-PZ-Si-110303

NKT Photonics Inc.
1400 Campus Drive West ● Morganville
NJ 07751 ● USA
Phone: +1 732 972 9937
Fax:
+1 732 414 4094