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Fiber Loopback Device
Optical Networking Accessories

Fiber Loopback Device

Supplier
China-tscom
Category
Optical Networking Accessories
Origin
China

Fiber optic loopbacks route transmitted optical signals directly back to the receiver within the same connector interface, enabling verification of transmit and receive functionality on optical transceivers and network ports. Available in duplex or multi-fiber configurations, they provide a simple and reliable method for validating link integrity, receiver sensitivity, and port operation. Fiber optic loopbacks are widely used for diagnostics, commissioning, and troubleshooting in high-speed optical networks. Available with duplex or multi-fiber connectors Low insertion loss and high return loss for stable signal reflection Precision-polished ferrules (PC/UPC/APC) Available in cable assembly or compact housing formats Custom cable lengths available for specific testing requirements 100% factory terminated and performance tested

Specification Snapshot
Operating Temperature
-10–+60 °C
Storage Temperature
−40 to +85
Insertion Loss [Single Mode; SC/LC, Etc.; APC]
≤0.60 dB
Insertion Loss [Single Mode; SC/LC, Etc.; UPC]
≤0.40 dB
Insertion Loss [Single-mode；MTP®/MPO；Low Loss]
≤0.70 dB
Insertion Loss [Single-mode；MTP®/MPO；Standard Loss]
≤1.50 dB
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Overview

Fiber optic loopbacks route transmitted optical signals directly back to the receiver within the same connector interface, enabling verification of transmit and receive functionality on optical transceivers and network ports. Available in duplex or multi-fiber configurations, they provide a simple and reliable method for validating link integrity, receiver sensitivity, and port operation. Fiber optic loopbacks are widely used for diagnostics, commissioning, and troubleshooting in high-speed optical networks. Available with duplex or multi-fiber connectors Low insertion loss and high return loss for stable signal reflection Precision-polished ferrules (PC/UPC/APC) Available in cable assembly or compact housing formats Custom cable lengths available for specific testing requirements 100% factory terminated and performance tested

Specifications

ParameterValue
Fiber Count [duplex type]2 fibers
Fiber Count [multifiber connector]2–48 fibers
Fiber Mode [Single-mode]G.652 / G.657
Fiber Mode [Multimode]OM1 / OM2 / OM3 / OM4
Cable Jacket MaterialLow Smoke Zero Halogen (LSZH) / PVC
Cable Jacket RatingsRiser (OFNR) / Plenum (OFNP)
Cable Jacket Color [G.652/G.657；customized available]Yellow
Cable Jacket Color [OM1/OM2；customized available]Orange
Cable Jacket Color [OM3；customized available]Aqua
Cable Jacket Color [OM4；customized available]Aqua / Magenta
Connector TypeSC / LC / MPO / MTP®
Connector Color [SC/LC；SM(APC)；customized available]Green
Connector Color [SC/LC；SM(PC)；customized available]Blue
Connector Color [SC/LC；OM3；customized available]Aqua
Connector Color [SC/LC；OM4；customized available]Magenta/Aqua
Connector Gender [MTP®/MPO]Male / Female
Loopback Housing ColorBlack
Operating Temperature-10–+60 °C
Storage Temperature−40 to +85
Standard ComplianceTIA-568.3-D; IEC61754 series; IEC61753-1; TIA-604 series; Telcordia GR-326-CORE; Telcordia GR-1435-CORE
RoHS ComplianceYes
Durability [SC/LC, etc.; ≤0.4 dB typical change]500 matings
Durability [MTP®/MPO；≤0.6 dB typical change]50 matings
Wavelength [Single-mode]1310 / 1550
Insertion Loss [Single Mode; SC/LC, Etc.; APC]typical:≤0.30 dB
Insertion Loss [Single Mode; SC/LC, Etc.; APC]≤0.60 dB
Insertion Loss [Single Mode; SC/LC, Etc.; UPC]typical:≤0.20 dB
Insertion Loss [Single Mode; SC/LC, Etc.; UPC]≤0.40 dB
Insertion Loss [Single-mode；MTP®/MPO；Low Loss]typical:≤0.50 dB
Insertion Loss [Single-mode；MTP®/MPO；Low Loss]≤0.70 dB
Insertion Loss [Single-mode；MTP®/MPO；Standard Loss]typical:≤0.80 dB
Insertion Loss [Single-mode；MTP®/MPO；Standard Loss]≤1.50 dB
Return Loss [Single-mode；PC]≥50 dB
Return Loss [Single-mode；APC]≥60 dB
Wavelength [Multimode]850 / 1300
Insertion Loss [Multimode; SC/LC, Etc.; APC]typical:≤0.30 dB
Insertion Loss [Multimode; SC/LC, Etc.; APC]≤0.60 dB
Insertion Loss [Multimode; SC/LC, Etc.; PC]typical:≤0.20 dB
Insertion Loss [Multimode; SC/LC, Etc.; PC]≤0.40 dB
Insertion Loss [Multimode；MTP®/MPO；Low Loss]typical:≤0.50 dB
Insertion Loss [Multimode；MTP®/MPO；Low Loss]≤0.70 dB
Insertion Loss [Multimode；MTP®/MPO；Standard Loss]typical:≤0.60 dB
Insertion Loss [Multimode；MTP®/MPO；Standard Loss]≤1.20 dB
Return Loss [Multimode；PC]≥20 dB
Return Loss [Multimode；APC]≥40 dB
Connector Color [MTP®/MPO；Low Loss；SM(APC)；customized available]Yellow
Connector Color [MTP®/MPO；Low Loss；SM(PC)；customized available]Yellow
Connector Color [MTP®/MPO；Low Loss；OM3；customized available]Aqua
Connector Color [MTP®/MPO；Low Loss；OM4；customized available]Magenta/Aqua
Connector Color [MTP®/MPO；Standard；SM(APC)；customized available]Green
Connector Color [MTP®/MPO；Standard；SM(PC)；customized available]Blue
Connector Color [MTP®/MPO；Standard；OM3；customized available]Aqua
Connector Color [MTP®/MPO；Standard；OM4；customized available]Magenta/Aqua

Applications

Transceiver and port loopback verification Network link testing and diagnostics System commissioning and burn-in testing

Datasheet

Product Datasheet
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Supplier Information

Ch
China-tscom
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Founded in 2000 and listed on the ChiNext of Shenzhen Stock Exchange in 2016, T&S Communications is a national high-tech enterprise focusing on the R&D, production and sales of core optical communication components and integrated functional modules. As a globally leading manufacturer of MTP/MPO high-density optical fiber connectors and one of the world's largest manufacturers of ceramic ferrules, the company's products are widely used in large and ultra-large data centers, cloud computing platforms, AI training clusters, telecommunication networks and next-generation intelligent computing infrastructure in North America and Europe, continuously providing high-quality optical connection products and solutions to global leading cloud service providers, equipment manufacturers and data center operators. The company has a rich product line, covering passive optical components such as high-density optical fiber connectors, conventional optical fiber connectors, PLC splitters, and wavelength division multiplexers, active optical components such as high-speed optical modules and active optical cables, as well as key basic components such as ceramic ferrules, MT ferrules, planar lightwave circuit wafers and chips. T&S Communications has three subsidiaries: Hechuan Powder, Ruixinyuan, and Tesilu Precision, and has established a production base in Vietnam. Relying on the "Guangdong Provincial Optical Fiber Sensing (T&S Communications) Engineering Technology Research Center", the company actively promotes the large-scale application of optical fiber sensing technology in fields such as electric power, transportation, energy, and infrastructure. Looking to the future, T&S Communications closely follows the development trends of ultra-high computing power and the Internet of Everything, focusing on cutting-edge businesses such as high-density optical interconnection, CPO (Co-Packaged Optics) and optical fiber sensing, and is committed to building a high-density, high-speed, intelligent "optical communication + optical sensing" product system, providing global customers with reliable and forward-looking products and solutions.

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