Fiber Optic 
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Loopback Connector Series
- LC/SC/MPO/MTP compatible – reduces inventory needs.
- Duplex & multi‑fiber – one unit, multiple uses.
- Standard or low‑loss MPO/MTP – performance on your budget.
- PC & APC polish – minimises back‑reflection.
- Rugged housing & cables – durable for repeated use.
- Precise insertion loss – tests the network, not the cable.
- Singlemode & multimode – universal fibre compatibility.
- A/B/C polarity – avoids costly re‑termination.
- 100% factory tested – zero defects, out‑of‑box.
- Custom lengths – neat installation, saves space.
The Abalone Loopback Connector Series is designed for optical signal loopback testing in fiber optic communication networks. By routing the transmitted optical signal directly back to the receiver within the same interface, it enables efficient verification of transmitter performance, receiver sensitivity, and overall network functionality.
The series is available in LC, SC, MPO, and MTP connector configurations and is widely used in data centers, telecom networks, optical equipment manufacturing, system commissioning, and maintenance applications.
Features:
- Available in LC, SC, MPO, and MTP connector types
- Supports duplex and multi-fiber loopback configurations
- Standard loss and low loss MPO/MTP options available
- PC and APC polishing options supported
- Housing type and cable type designs available
- High precision insertion loss control
- Compatible with singlemode and multimode fiber
- Supports A, B, and C polarity options for MPO/MTP versions
- 100% factory terminated and tested
- Custom lengths available for project requirements
OEM / ODM
Abalone provides OEM and ODM services for Loopback Connector Series based on customer project requirements:
- Connector type customization (LC / SC / MPO / MTP)
- Singlemode and multimode fiber options
- MPO/MTP polarity customization (Type A / B / C)
- Standard loss and low loss configurations
- Customized cable length and housing design
- Private labeling and customized packaging available
Application
- Optical transmitter and receiver loopback testing
- Data center 40G / 100G / 200G / 400G network validation
- Telecom equipment testing and commissioning
- Fiber optic system troubleshooting
- Optical network maintenance
- Equipment aging and reliability testing
Parameter of Loopback Connector Series
SPECIFICATIONS
| Parameter | Specification |
| Product Name | Loopback Connector Series |
| Connector Type | LC / SC / MPO / MTP |
| Fiber Count | 2 Fibers (Duplex Type); 2–24 Fibers (MPO/MTP Type) |
| Fiber Mode | Singlemode G.652.D / G.657.A1 / G.657.A2; Multimode OM1 / OM2 / OM3 / OM4 |
| Polish Type | PC / APC |
| Structure Type | Housing Type / Cable Type |
| Cable Jacket | LSZH / OFNR / OFNP |
| Polarity | Type A / Type B / Type C |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -40°C to +85°C |
OPTICAL PERFORMANCE
| Parameter | Single mode | Multi mode |
| Insertion Loss (SC/LC) | ≤ 0.20 dB (typ. ≤ 0.10 dB) | ≤ 0.20 dB (typ. ≤ 0.10 dB) |
| Insertion Loss (MPO/MTP) | ≤ 0.35 dB (Low Loss) / ≤ 0.75 dB (Standard Loss) | ≤ 0.35 dB (Low Loss) / ≤ 0.60 dB (Standard Loss) |
| Return Loss | PC ≥ 50 dB / APC ≥ 60 dB | PC ≥ 20 dB / APC ≥ 40 dB |
| Durability | ≤ 0.2 dB change (50 mating cycles) | ≤ 0.2 dB change (50 mating cycles) |
| Wavelength | 1310 / 1550 nm | 850 / 1300 nm |
TECHNICAL NOTES
- Loopback connectors should be selected according to the connector interface and fiber type of the equipment under test.
- MPO/MTP polarity should match the network architecture requirements.
- Low-loss MPO/MTP loopback connectors are recommended for high-speed 100G, 200G, and 400G applications.
- Custom configurations are available for specific testing and deployment requirements.
FAQ
Q1：What is a fiber optic loopback connector?
A fiber optic loopback connector is a testing device that routes the transmitted optical signal back to the receiving port within the same connector interface. It is used to verify transmitter operation, receiver sensitivity, and overall network performance.
Q2：What is the difference between LC, SC, MPO, and MTP loopback connectors?
LC and SC loopback connectors are duplex solutions commonly used in traditional fiber optic testing. MPO and MTP loopback connectors support multiple fibers and are designed for high-density data center and high-speed network applications.
Q3：What is the difference between MPO and MTP loopback connectors?
MTP connectors are premium MPO-compatible connectors with improved mechanical performance, tighter tolerances, and lower insertion loss characteristics. Both can be used for loopback testing applications.
Q4：When should low-loss MPO/MTP loopback connectors be used?
Low-loss MPO/MTP loopback connectors are recommended for 100G, 200G, and 400G optical networks where minimizing insertion loss is critical to achieving accurate testing results and maintaining link budgets.
Q5：Can loopback connectors be customized?
Yes. Abalone provides OEM and ODM services including connector type, fiber mode, polarity, cable length, housing design, labeling, and packaging customization.
Q6：What fiber types are available for Abalone loopback connectors?
Abalone loopback connectors are available in Singlemode (G.652.D, G.657.A1, G.657.A2) and Multimode (OM1, OM2, OM3, OM4) fiber options.
Q7：Are loopback connectors suitable for 400G data center testing?
Yes. MPO and MTP loopback connectors are widely used for testing and validating 40G, 100G, 200G, and 400G data center networks, including commissioning, troubleshooting, and equipment verification.
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Datasheet
