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| Form Factor | Part No. | Fiber Type | Data Rate | Wavelength | Distance | Connector | Case Temperature | Note |
| OSFP | CLOSFP800GLP | Loopback | 800G | - | - | Com./Ind. | ||
| QSFPDD | CLQSFPDD800GLP | Loopback | 800G | - | - | Com./Ind. | ||
| QSFPDD | CLQSFPDD400GLP | Loopback | 400G | - | - | Com./Ind. | ||
| QSFP112 | CLQSFP400GLP | Loopback | 400G | - | - | Com./Ind. | ||
| QSFP56 | CLQSFP200GLP | Loopback | 200G | - | - | Com./Ind. | ||
| QSFP28 | CLQSFP100GLP | Loopback | 100G | - | - | Com./Ind. | ||
| QSFP+ | CLQSFP40GLP | Loopback | 40G | - | - | Com./Ind. | ||
| SFP28 | CLSFP25GLP | Loopback | 25G | - | - | Com./Ind. | ||
| SFP+ | CLSFP16GLP | Loopback | 16G | - | - | - | Com./Ind. | |
| SFP+ | CLSFP10GLP | Loopback | 10G | - | - | Com./Ind. | ||
C-LIGHT Loopback optical modules are designed for network testing, signal verification, fault isolation, and equipment diagnostics across modern optical and Ethernet infrastructures. A loopback module redirects an optical or electrical signal back toward the transmitting equipment, allowing network ports and communication paths to be evaluated without requiring a remote optical connection.
The C-LIGHT Loopback portfolio covers multiple data rates from 10G to 800G and is available in OSFP, QSFP-DD, QSFP112, QSFP56, QSFP28, QSFP+, SFP28, and SFP+ form factors. This broad platform selection allows loopback modules to be matched with different generations of switches, routers, optical test equipment, and high-speed data center networking systems.
The product family supports multiple network speeds, including 10G, 25G, 40G, 100G, 200G, 400G, and 800G configurations.
Available packages include OSFP, QSFP-DD, QSFP112, QSFP56, QSFP28, QSFP+, SFP28, and SFP+ for different equipment platforms.
Loopback modules allow individual optical ports to be tested by returning the transmitted signal to the corresponding receiving path.
The modules provide a practical method for checking whether network ports and transmission paths can successfully transmit and receive signals.
Loopback testing can help determine whether a communication problem originates from a port, transceiver, cable path, or remote network connection.
Loopback configurations can be used during protection and recovery testing to verify network behavior under different link conditions.
The current product specifications provide commercial and industrial temperature options for the listed loopback configurations.
800G, 400G, and 200G loopback solutions are available for testing high-bandwidth data center network equipment.
Loopback modules can be inserted into high-speed switch ports to verify port operation during deployment, maintenance, and troubleshooting.
Loopback testing provides a convenient way to evaluate optical interfaces and confirm whether a network port can establish a valid local transmission path.
Network engineers can use loopback modules to isolate faults on Ethernet switches, routers, and other optical networking equipment.
Loopback techniques can be applied to optical transport equipment to support signal verification and troubleshooting at different network layers.
Loopback modules can support testing and diagnostics in optical links used by 5G fronthaul infrastructure.
High-speed loopback modules provide a testing option for network ports used in data center interconnection systems.
Loopback devices can be used during equipment commissioning, routine maintenance, and post-installation troubleshooting.
Loopback testing can help verify the response of protection and recovery mechanisms before a network is placed into full service.
One product family covers applications from 10G through 800G, making it suitable for both established and next-generation network environments.
The broad range of form factors allows customers to select a loopback solution matching the physical interface of their network equipment.
Loopback testing provides a straightforward method for checking local port functionality without requiring a complete remote network connection.
800G, 400G, and 200G options address testing requirements for high-bandwidth AI data center and cloud networking infrastructure.
Commercial and industrial temperature options provide additional flexibility for different operating environments.
C-LIGHT states that its optical transceiver products are compatible with switches from more than 100 brands.
C-LIGHT states that every product passes initial testing, final testing, and factory inspection before shipment.
C-LIGHT provides technical guidance, compatibility testing, customized solutions, and long-term product support for network deployments.
A loopback optical module is a test device that returns a transmitted signal back toward the receiving interface, allowing a network port or transmission path to be tested locally.
C-LIGHT provides loopback configurations for 10G, 25G, 40G, 100G, 200G, 400G, and 800G network applications.
The current portfolio includes OSFP, QSFP-DD, QSFP112, QSFP56, QSFP28, QSFP+, SFP28, and SFP+ form factors.
It can be used for port testing, signal verification, fault isolation, equipment diagnostics, network commissioning, and maintenance.
Yes. C-LIGHT lists both OSFP and QSFP-DD 800G loopback configurations for high-speed network testing.
Yes. By testing the local port independently, loopback testing can help determine whether a problem is associated with the local equipment or the external transmission path.
Yes. The current product specifications list commercial and industrial temperature options for the loopback series.
Yes. C-LIGHT provides customized solutions according to interface type, data rate, equipment compatibility, operating environment, and testing requirements.
C-LIGHT Loopback optical modules provide a practical solution for testing, troubleshooting, and validating modern optical and Ethernet network interfaces. Covering 10G through 800G and supporting OSFP, QSFP-DD, QSFP112, QSFP56, QSFP28, QSFP+, SFP28, and SFP+ form factors, the product family can be used across data centers, optical transport systems, 5G fronthaul networks, and enterprise infrastructure. By providing a local signal return path, loopback testing helps simplify port verification, fault isolation, network commissioning, and maintenance.
Contact Us●100% of products pass initial test, final test and factory inspection.
●3-step quality control management process.
●100% complete implementation of customer order quality requirements.
●100% guarantee of customer product data information security.
Please contact us to download the certification certificate.
Please Note: Installing a third party transceiver does not void your network equipment warranty. Network equipment manufacturers all have guidelines stating that warranty support on their products will not be affected.
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