Attenuating Splitter Branching Fiber-optic Patch Cords
The Splitter Branching Fiber-optic Patch Cord with an integrated attenuating filter are ideal for applications where optical power coupled into a fiber is too high.
Fabrication of this product is similar to the standard splitter branching fiber-optic patch cords, with an additional ND filter between the splitting junction. Addition of attenuating filter does not affect light distribution inside the optical fiber, only transmission is reduced
- For attenuating patch cords, optical transmission is specified for visible light, and measured at a 465 nm wavelength. Please note that for a 405 nm wavelength (UV), the transmission value is about half of the specification for visible light.
The final power output from SBP-ATTN is attenuation factor times the output from standard SBP. For example, if we have 2x 200 µm, coupling into each output is about 16% because the input diameter core is 480 µm. If we add a 5% attenuation filter, coupling into each output will be 0.8% in reality (16% x 5% = 0.8%).
Optical Fiber Core Diameter
( μm )
Number of Output Fibers
Internal Input Optical Fibre Core Diameter ( μm ) Coupling into Each Output† 200 2x 480 16% x T 3x 480 16% x T 4x 730 7% x T 400 2x 960 16% x T 3x 960 16% x T 4x 960 16% x T †T refers to % transmission.
This approach uses a 50 mm long metal tube with a 6.35 mm diameter to protect the passage from 1 to several fibers. The length of patch-cord from the metal tube to the patch-cord split, called the central jacket, can be protected using a different jacket type. Splitter patch cords are not suitable for short cables less than 30 cm long. This version allows improved splitting of laser light over older models. In all other applications, the Splitter Branching Patch Cords maintain the same high-quality performance as our legacy Standard Branching Patch Cords.
Minimum total cable length is 35 cm.
• The Type-A patch cords have no central jacket, with the splitter starting at the metal tube. The split is done 17.5 cm from the input.
• The Type-B patch cords have a central jacket covering the length between the metal tube and the splitter. The split is done at 15 cm from the output.
NA Fiber-optic Code
Core Cladding Buffer Silica/Silica 200 220 240 0.22 200/220-0.22 200 220 245 0.37 200/220-0.37 400 440 480 0.22 400/440-0.22 400 440 470 0.37 400/440-0.37 Silica/Polymer 200 230 500 0.48 200/230-0.48 400 430 730 0.48 400/430-0.48
Comparison Table : Protective Jacket Code Description Color OD
Flexibility Fiber break protection Fiber pull protection Proposed usage PKMJ
Stainless monocoil with kevlar and PUR 3.0 mm
Black 3.0 11 Good
Excellent Best compromise between flexibility and robustness ARBK Stainless armor with PVC 3 mm Black 3.0 15 Low Excellent Excellent Preferred for maximum robustness
Jacket availability may vary with optical fiber type
Termination Codes for Fiber-Optic Patch cords Description Product Termination Code FC Connector with Metal Ferrule FCM SMA Connector with Metal Ferrule SMA
Splitter Branching Patch Cord
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