{"product_id":"shelyak-pf0019","title":"Shelyak Calibration Optical Fiber - 200µm, 10m","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eCore Diameter:\u003c\/strong\u003e 200µm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 10 meters\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnectors:\u003c\/strong\u003e FC-FC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumerical Aperture:\u003c\/strong\u003e 0.22\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtection:\u003c\/strong\u003e Stainless Steel Sheath\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAttenuation:\u003c\/strong\u003e \u0026lt;0.5dB\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eShelyak Calibration Optical Fiber - 200µm, 10m\u003c\/h2\u003e\n\u003cp\u003eThis 10m Shelyak calibration fiber uses a 200µm core diameter, the standard for delivering a clean calibration signal in fiber-fed Echelle systems like the eShel and Whoppshel. With a numerical aperture of 0.22 and rugged stainless steel protection, it ensures a stable and robust connection from your calibration module to the spectrograph's FIGU. Its design guarantees near 100% transmission along the fiber itself, with total attenuation kept below 0.5dB—a figure that remains consistent even for longer 20m versions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eHigh-Fidelity Signal Path: The 200µm Core for eShel Systems\u003c\/h3\u003e\n\u003cp\u003eEngineered specifically for astronomical spectroscopy, this fiber's 200µm core provides an optimal light path from a calibration lamp to the spectrograph. The industry-standard FC-FC connectors ensure a secure, threaded coupling that minimizes signal loss at the junction points. The entire length is protected by a flexible stainless steel sheath, safeguarding the delicate fiber from being crushed or kinked in an active observatory environment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eConsistent Signal Strength: \u0026lt;0.5dB Attenuation Across All Lengths\u003c\/h3\u003e\n\u003cp\u003eA key characteristic of this fiber is that signal loss is dominated by the connectors, not the length of the cable. Transmission through the fiber itself is close to 100%, resulting in total attenuation of less than 0.5dB. This means you can run this 10m cable, or even a longer 20m version, without any practical degradation in your calibration lamp's signal intensity, giving you greater flexibility in positioning your equipment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the primary use for the Shelyak 200µm calibration fiber?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis fiber is designed to conduct light from a calibration module (like a Thorium-Argon or Tungsten lamp) to the Fiber Injection \u0026amp; Guiding Unit (FIGU) of a spectroscope. It is specifically optimized for Shelyak's own eShel and Whoppshel Echelle spectroscopy systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIf I place my eShel calibration unit 15 meters away, will a longer fiber have more signal loss than this 10m fiber?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, you should not see any practical difference in signal strength. The manufacturer specifies that attenuation is less than 0.5dB regardless of length (up to 20m). This is because the minimal signal loss occurs at the FC-FC connector junctions, not along the highly transmissive fiber itself.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the core diameter of this Shelyak fiber 200µm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e200µm core diameter\u003c\/strong\u003e is matched to the optical design of spectrographs like the eShel. This ensures the maximum amount of light from the calibration lamp is efficiently captured and injected into the spectrograph for accurate wavelength calibration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have a Whoppshel spectrograph. Is this 10m calibration fiber the correct one to use?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. This 200µm calibration fiber is explicitly designed and optimized for use with both the Shelyak eShel and Whoppshel spectroscopy systems, ensuring full compatibility and reliable operation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are FC-FC connectors on this 200µm fiber?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eFC connectors\u003c\/strong\u003e are a standard for high-quality optical fibers. They provide a secure, threaded connection that ensures precise alignment of the fiber cores, which minimizes signal loss and prevents accidental disconnection during an observing session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the stainless steel protection on the Shelyak calibration fiber do?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe stainless steel sheath acts as a durable armor for the delicate glass fiber inside. It protects the fiber from being crushed by equipment, kinked from tight bends, or otherwise damaged, ensuring the long-term reliability and signal integrity of your calibration setup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCore Diameter\u003c\/td\u003e\n\u003ctd\u003e200µm (for calibration fibers)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Lengths\u003c\/td\u003e\n\u003ctd\u003e10 or 20 meters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection\u003c\/td\u003e\n\u003ctd\u003eStainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector Type\u003c\/td\u003e\n\u003ctd\u003eFC-FC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumerical Aperture (NA)\u003c\/td\u003e\n\u003ctd\u003e0.22\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAttenuation\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.5dB (valid for 5, 10, or 20m lengths)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Note\u003c\/td\u003e\n\u003ctd\u003eLosses mainly occur at connector junctions. The transmission of the fiber itself is close to 100% over these lengths.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCalibration Optical Fiber (200µm, 10m)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/shelyak-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eShelyak 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Shelyak","offers":[{"title":"Default Title","offer_id":52943036875037,"sku":"SHK-PF0019","price":731.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-Calibration-optical-fiber-200-m-20m-1_e6df1f51-e1ad-47b3-934d-72af6006da21.jpg?v=1789616069","url":"https:\/\/davidastro.com\/products\/shelyak-pf0019","provider":"David Astro","version":"1.0","type":"link"}