Soon: PM PCF Broadband Fiber Cables

Polarization-maintaining, endlessly single-mode, photonic crystal fibers series PCF-P with Gaussian intensity profile

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Features

Polarization-maintaining, endlessly single-mode, photonic crystal fiber cables series PCF-P with Gaussian intensity profile and low-stress fiber connectors with end caps.
  • Broadband fiber with wavelength range 370 nm - 1200 nm
  • PCF fiber with 5 µm core, pure silica
  • Measured values for fiber NA: NAe2
  • Mode-field diameter almost independent of wavelength
  • Fiber patch cable with Ø 900 µm buffer or as Ø 3 mm cable with Kevlar strain-relief
  • Connectors type FC with 0°-polish or 8°-polish
  • Polarization axis is indicated by ­connector index key (slow axis)
  • Amagnetic titanium connectors for connectors of type FC PC or FC APC
  • End caps for a smaller power density at the fiber end-faces
  • Polarization-maintaining PCF Fiber
  • Coming soon! Contact us for more information.

Description

Polarization-maintaining, endlessly single-mode, photonic crystal fiber cables series PCF-P with Gaussian intensity profile and low-stress fiber connectors with end caps.

Fiber
The fiber is a polarization-maintaining, endlessly single-mode PCF fiber, categorized by its core diameter (e.g. 5 µm or 10 µm). The mode-field diameter MFD is almost independent of wavelength. The effective numerical NAe2 is measured for each connectorized fiber by Schäfter+Kirchhoff. The special broadband fiber has an operational wavelength range of 370 nm to 1200 nm.

    Fiber Cable
    The fiber length can be customer-specified (there is a minimum fiber length). The polarization-maintaining PCF fiber cables are offered as Ø 900 µm buffer in black, or a Ø 3 mm cable in black with Kevlar strain-relief.

    Fiber Connectors
    For each fiber end the fiber connector type can be chosen (FC PC with 0°-polish or FC APC with 8°-polish). The fiber connectors of type FC assembled by Schäfter+Kirchhoff have an alignment index (key). The wide key (type "N") fiber connector has an alignment index (key) of 2.14 mm width. The narrow key (type "R") fiber connector has an alignment index (key) of 2 mm width. Special fiber connectors are available so that the fiber cable is vaccum compatible down to 10-7 mbar (only Ø 900 µm buffer fiber cables).

    End Caps
    The fiber connectors of all PCF fiber cables are equipped with an end cap. This means that a short piece of coreless fiber (< 300 µm) is spliced onto the polarization-maintaining PCF fiber. Without a fiber core to confine the beam, the mode field diameter of the beam already starts to diverge within the fiber end cap, significantly reducing the power density at the fiber end-face.

    Amagnetic fiber connectors
    For FC PC or FC APC type connectors amagnetic versions completely made of titanium can be selected. Those connectors have a ceramic ferrule.

    Coming soon. Contact us for more information and availability!

    Technical data

    Soon: PM PCF Broadband Fiber Cables

    Order code
    PCF-P-5
    Fiber type
    PCF, polarization-maintaining,
    endlessly single-mode
    Wavelength min.
    350 nm
    Wavelength max.
    1200 nm
    Nominal MFD (@532 nm)
    4.2 ± 0.5 µm
    Core diameter
    5.0 ± 0.5 µm
    PER
    ≥ 21 dB (typ. ≥ 25 dB)
    Effective fiber NAe2
    0.075 (@780 nm) ± 0.005,
    wavelength-dependent
    Fiber connector type
    FC PC or FC APC with end caps
    End cap length
    230 ± 50 µm
    Core and cladding material
    Pure silica
    Bend radius min.
    tbd
    Cable length
    100 - 1000 cm
    Cable
    Ø 900 µm buffer or
    Ø 3 mm cable with
    Kevlar strain-relief
     
    All values are preliminary

    FAQ

    • What are PCF fibers? What is the difference to a standard fiber?
      • What is a large mode area PCF fiber?
        For single-mode fibers, there is a change in refractive indices between core and cladding.
        In large mode area PCF fibers the single-mode transport is introduced by microstructuring the fiber cladding. In our case the PCF fibers have a hexagonal structure of periodic holes that lead to a single-mode transport within the fiber. The fibers are categorized by their core diameter (e.g. 5 µm or 10 µm). Detailed calculations reveal that for this type of fibers the mode field diameter MFD is almost wavelength-independent. It is larger than the MFD of comparable standard fibers. In contrast, the numerical aperture has a significant wavelength-dependency. This is important to consider when collimating a beam for a large wavelength range.
      • When should I use a PCF fiber instead of a standard single-mode fiber?
        Our PCF fibers are endlessly single-mode, (polarization-maintaining, only type PCF-P), specialized photonic crystal fiber cables with Gaussian intensity profile and low-stress fiber connectors with end caps. They have an operational wavelength range of 300 - 1200 nm and can be used for example for very broadband applications or with supercontinuum lasers. 
        Standard (PM) fibers have a much more limited operational wavelength range and are no longer single-mode below the cut-off wavelength.

        If you need a broadband fiber, there are also special RGB fibers that are broadband and do cover a range of 400 - 680 nm.
         
        For standard applications standard fibers should be preferred over specialized PCF fibers.
      • What is the difference between a PCF fiber and a standard fiber?
        Single-mode fibers are primarily characterized by their numerical aperture (NA) and their cut-off wavelength λc0. The mode field diameter MFD changes with wavelength and in first approximation the NA is considered to be constant. Detailed measurements however reveal that the NA is also wavelength dependent.

        In large mode area PCF fibers, the single-mode transport is introduced by microstructuring the fiber cladding. The fibers are categorized by their core diameter (e.g. 5 µm or 10 µm). Detailed calculations reveal that for this type of fibers the mode field diameter MFD is almost wavelength-independent. It is larger than the MFD of comparable standard fibers. In contrast, the numerical aperture has a significant wavelength-dependency. This is important to consider when collimating a beam for a large wavelength range.
    • Connector Type FC PC and FC APC
      • How do I attach a fiber cable?

        1. To prevent damage to the sensitive fiber end-face, always insert the fiber connector`s ferrule at an angle, with the connector key properly aligned to the receptacle notch.
        2. When the ferrule tip is safely located in the inner cylinder of the receptacle, align the connector to the receptacle axis and carefully introduce the connector into the fiber coupler.
        3. Then, orient the connector key in a way that it is pressed gently onto the right-hand side of the receptacle notch ("right-hand orientation rule").
        4. Gently screw on the connector cap nut onto the receptacle until it is finger-tight.
        5. Gently tighten the fiber grub screw to reduce the free play of the ferrule in the receptacle.

      • What is the "right-hand orientation rule"?

        When the ferrule tip is safely located in the inner cylinder of the receptacle, align the connector to the receptacle axis and carefully introduce the connector into the fiber coupler. 

        Then, orient the connector key in a way that it is pressed gently onto the right-hand side of the receptacle notch.

        The tightened grub screw and the "right-hand orientation rule" for the connector, ensure a high reproducibility in mode field position and angle, which is especially important for attaching and reattaching polarization-maintaining fibers reproducibly.

      • Can I attach a narrow key fiber cable to a fiber coupler with a wide key receptacle?

        Yes you can- without any problem. Simply adhere to the "right-hand orientation rule".

        Generally, with any FC PC or FC APC type connector there is a freeplay when inserting the fiber into the fiber coupler. The free play in between the connector ferrule and receptacle is only a few microns, but necessary for inserting the ferrule without force. There is a difference between the receptable and key width for wide key (2.14 mm) and narrow key (2.0 mm) fibers. If you follow th so-called "right-hand orientation rule" you can reproducibly attach and reattach even PM fibers  with narrow key receptacle to fiber couplers with wide key receptacle without difficulty.

        "Right-hand orientation rule":

        When the ferrule tip is safely located in the inner cylinder of the receptacle, align the connector to the receptacle axis and carefully introduce the connector into the fiber coupler. Then, orient the connector key in a way that it is pressed gently onto the right-hand side of the receptacle notch.The tightened grub screw and the "right-hand orientation rule" for the connector, ensure a high reproducibility in mode field position and angle, which is especially important for attaching and reattaching polarization-maintaining fibers reproducibly.


    Accessories

    Measurement tool for coupling into polarization-maintaining fiber cables

    Fiber Adapters without Optics
    Fiber connector cleaning tool