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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
Shelyak Instruments 200µm Calibration Optical Fiber - 20m

Shelyak Instruments 200µm Calibration Optical Fiber - 20m

by Shelyak
SKU SHK-OP0024
$731.00 - $731.00
$731.00
$731.00 - $731.00
$731.00
Price Match Policy!
  • 20 meter length for flexible observatory layouts
  • 200µm core diameter optimized for calibration sources
  • Secure FC-FC connectors for standard astronomical instruments
  • Numerical Aperture of 0.22
  • Durable stainless steel protective sheathing
  • Signal attenuation less than 0.5dB
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  • Description
  • FAQ
  • Specifications
  • Warranty

  • Shelyak Instruments 200µm Calibration Optical Fiber - 20m

    This Shelyak Instruments 20-meter optical fiber uses a 200µm core to deliver a stable, high-fidelity signal for calibrating fiber-fed Echelle spectrographs like the eShel or Whoppshel. The cable features industry-standard FC-FC connectors and a numerical aperture of 0.22, protected by a durable stainless steel sheath. With signal transmission close to 100% and total attenuation under 0.5dB, it ensures your calibration source light reaches the spectrograph with minimal loss, regardless of the 20-meter distance.

    200µm Core for High-Fidelity Spectrograph Calibration

    The 200µm core diameter is specifically sized to transmit light from a calibration unit to the spectrograph's fiber injection and guiding unit (FIGU). This diameter ensures a clean, uniform illumination of the spectrograph slit, which is essential for obtaining accurate and repeatable wavelength and flat-field calibrations. It is optimized for the controlled environment of a calibration lamp, not for collecting faint starlight.

    Robust 20-Meter Construction with FC-FC Connectors

    A generous 20-meter length provides the flexibility to position your spectrograph and calibration unit anywhere in the observatory or lab without signal degradation. The fiber is protected by a stainless steel sheath, safeguarding it from crushing or kinking during setup and use. Standard FC-FC connectors provide a secure, repeatable physical connection to Shelyak instruments and other compatible hardware.

    Near-100% Transmission for eShel and Whoppshel Systems

    This fiber is engineered for minimal signal loss, with a transmission rate approaching 100% through the fiber itself. Total system attenuation is kept below 0.5dB, a figure that remains constant even at this 20-meter length. While the fiber is highly efficient, remember that the primary source of light loss occurs at the connectors; ensuring clean, secure junctions is key to maintaining a pure calibration signal for your eShel or Whoppshel system.

  • Why is the core diameter 200µm for this Shelyak calibration fiber?

    The 200µm core diameter is specifically chosen to match the requirements of calibration units used with spectrographs like the Shelyak eShel. It provides a broad, even illumination of the spectrograph slit, which is critical for accurate flat-fielding and wavelength calibration.

    Will the 20-meter length of this fiber reduce my calibration signal strength?

    No. The fiber itself has a transmission rate close to 100%, and the total attenuation is rated at less than 0.5dB. This low level of loss is independent of the fiber's length up to 20 meters, so you will not see a noticeable drop in signal compared to a shorter fiber.

    What systems is the Shelyak 200µm fiber compatible with?

    This fiber is primarily designed for Shelyak Instruments' own fiber-fed spectrographs, such as the eShel and Whoppshel systems. It uses standard FC-FC connectors, making it potentially compatible with other astronomical or laboratory equipment that uses the same interface.

    I am setting up an eShel spectrograph in my observatory. Is this 20-meter fiber the correct one for connecting the calibration unit to the FIGU?

    Yes, this is the correct fiber for that purpose. The 200µm core is designed to carry the light from the calibration module to the Fiber Injection & Guiding Unit (FIGU) of the eShel. The 20-meter length offers ample flexibility for routing the cable between your telescope and the spectrograph.

    What are FC-FC connectors and why are they used on this calibration fiber?

    FC (Ferrule Connector) connectors are a type of fiber optic connector known for their secure, screw-on coupling mechanism. They provide excellent mechanical stability and repeatable alignment, which is critical in spectroscopy to prevent signal fluctuations. The FC-FC designation means the cable has this type of connector on both ends.

    My calibration lamp seems dim when using the 20-meter fiber with my Whoppshel system. Is the fiber causing the light loss?

    It is unlikely the fiber itself is the cause, as its attenuation is less than 0.5dB. The most common source of signal loss in a fiber optic system is at the connection points. Ensure both FC-FC connectors are perfectly clean (free of dust) and securely tightened to minimize junction loss and maximize signal throughput.

  • Core Diameter 200µm
    Length 20 meters
    Connectors FC-FC
    Numerical Aperture (NA) 0.22
    Protective Sheath Stainless Steel
    Signal Attenuation <0.5dB (independent of length up to 20m)
    Fiber Transmission Close to 100%
    Primary Loss Source Junctions at connector level
  • Shelyak 1-Year Warranty