Product Introduction
MPO Multimode Loopback Cables provide a loopback signal path for optical network testing, diagnostics, and equipment verification. By internally connecting the transmit (Tx) and receive (Rx) fibers within a single MPO connector, these cables enable network devices to perform self-testing and link validation without requiring additional testing instruments.
This product is designed for MPO interface validation, network troubleshooting, and transceiver functional testing in data centers, telecommunications networks, and optical lab environments.
Technical Specifications
|
Parameter |
Specification |
|
Connector Type |
MPO Male (with pins) / Female (without pins) |
|
Fiber Type |
Multimode OM3 / OM4 / OM5 |
|
Fiber Count |
8 / 12 / 24 Fibers |
|
Polarity / Pin Mapping |
Method A, B, C, or Custom Mapping (e.g., QSFP, QSFP28, QSFP-DD) |
|
Connector Polish |
PC |
|
Insertion Loss |
Standard Grade: ≤ 0.70 dB |
|
Return Loss |
≥ 20 dB |
|
Operating Wavelength |
850 nm / 1300 nm |
|
Jacket Material |
LSZH / PVC / OFNP (Plenum) |
|
Cable Length |
Customized loopback design |
|
Operating Temperature |
-20°C to +70°C |
|
Storage Temperature |
-40°C to +85°C |
|
Durability |
≥ 500 Mating Cycles |
|
Compliance |
IEC 61754-7, TIA-604-5 (FOCIS-5), RoHS, REACH |
Key Advantages
Precision Insertion Loss Grades
Available in Standard and Elite low-loss (≤ 0.35 dB) versions to ensure accurate link budget testing.
Custom Pin Mapping
Supports standard Type A/B/C polarities as well as specific loopback wiring for QSFP, QSFP28, and QSFP-DD optical modules.
Verified Geometry
Handled with precision factory polishing and 100% verified via 3D interferometers for optimal fiber alignment.
Equipment Compatibility
Fully compatible with standard MPO-enabled switches, transceivers, and patch panels.
Typical Applications
Data Center Port Validation
Testing and verifying high-density MPO switch ports and patch panels before full link deployment.
Optical Transceiver Testing
Performing functional loopback and burn-in testing for high-speed optical modules (e.g., 40G QSFP+, 100G QSFP28, 400G/800G QSFP-DD).
Network Troubleshooting
Isolating and diagnosing fiber optic link failures or signal degradation within telecommunication sub-systems.
Production Line QC
Utilized by optical equipment manufacturers for high-volume quality control and performance inspection during assembly.
R&D and Laboratory Testing
Suitable for optical communication experiments, protocol verification, and engineering hardware development.
Quality Assurance & Testing Process
To ensure consistent optical performance, every MPO loopback cable undergoes individual factory inspection and testing before packaging.
Our rigorous quality control pipeline includes:
100% insertion loss and return loss testing using EXFO/JDSU light sources and power meters.
Interferometer testing to verify fiber height, radius of curvature, and apex offset.
Digital microscope screening to guarantee a scratch-free and contamination-free optical surface.
Verification of internal fiber mapping against required schematics.
Customization Options
|
Customization Item |
Available Options |
|
Fiber Options |
OM3 / OM4 / OM5 |
|
Fiber Count |
8 / 12 / 24 Fibers |
|
Connector Gender |
Male (with guide pins) / Female (without pins) |
|
Wiring Layout |
Standard Type A/B/C, QSFP/QSFP28/QSFP-DD layout, or user-defined pinouts |
|
Jacket Material & Color |
LSZH / PVC / OFNP; Aqua, Violet, Lime Green, or customized colors |
|
Labeling & Packaging |
Custom barcodes, serial numbers, private labels, and custom PE bags |
B2B Supply & Services
DIMI FIBER is an OEM/ODM manufacturer supplying fiber optic connectivity products to distributors, system integrators, and telecom contractors worldwide.
Flexible MOQ
Supports both small-batch engineering samples and high-volume production.
Technical Support
Direct access to our engineering team for custom polarity layouts and specifications.
Fast Lead Times
Typically 3–7 working days for standard configurations.
Direct Factory Pricing
Transparent cost structure for wholesale and project-based purchasing.
FAQ
Q: What is the main application of an MPO loopback cable?
A: It provides an optical return path to connect the transmit (Tx) and receive (Rx) channels within a single MPO interface. This allows for self-testing, port diagnostics, and validation of network equipment and optical transceivers without deploying full links.
Q: Can you manufacture loopback cables for custom transceiver pinouts?
A: Yes. Beyond standard Method A, B, and C polarities, we customize internal fiber mapping to match the self-test pinouts of specific modules like QSFP, QSFP28, or QSFP-DD.Please provide your wiring schematic when submitting an inquiry.
Q: How is the quality of the MPO connector verified?
A: Every cable is individually tested.We use 3D interferometers to check connector geometry and EXFO/JDSU equipment to measure insertion loss and return loss.
Q: What are your standard lead times and MOQ?
A: We offer flexible MOQ options to accommodate prototyping and trial orders.Standard configurations typically carry a manufacturing lead time of 3 to 7 working days.
Q: Do you offer OEM and private labeling?
A: Yes.We provide comprehensive OEM/ODM services, including custom jacket colors, personalized labels with your part numbers/barcodes, and custom packaging.
Q: How can I obtain a quotation?
A: Please send your specifications-including fiber type (OM3/OM4/OM5), fiber count, connector gender, polarity mapping, and estimated quantity-to our sales team.
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