The MPO Single Mode Loopback Cable is a factory-terminated OS2 single-mode assembly that routes Tx channels back to designated Rx channels through an MPO interface for local optical verification of compatible ports and transceivers.
Technical Specifications
|
Parameter |
Specification |
|
Product Type |
MPO Single Mode Loopback Cable |
|
Fiber Type |
OS2 Single Mode, 9/125 μm |
|
Connector Interface |
MPO |
|
Connector Gender |
Male (pinned) / Female (unpinned) |
|
Fiber Count |
8F / 12F / 16F / 24F / 32F |
|
Connector Polish |
APC |
|
Polarity / Pin Mapping |
Standard or customer-specified Tx/Rx channel mapping |
|
Optical Attenuation |
0 dB standard; custom attenuation available |
|
Insertion Loss |
Standard: ≤0.70 dB; Elite Low Loss: ≤0.35 dB |
|
Return Loss |
≥60 dB |
|
Test Wavelength |
1310 nm / 1550 nm |
|
Cable Length |
Custom length according to confirmed configuration |
|
Cable Diameter |
3.0 mm; custom sizes subject to confirmation |
|
Jacket Options |
LSZH / OFNP / OFNR / PVC |
|
Operating Temperature |
-20°C to +70°C |
|
Standards |
IEC 61754-7, TIA-604-5, IEC 61300, RoHS |
|
Customization |
Fiber count, length, jacket, labeling and other confirmed configurations |
Loopback-Specific Optical Construction
Internal Optical Return Path
The fiber arrangement creates a defined optical return path within the MPO assembly rather than a conventional point-to-point connection.
Multi-Fiber Channel Return
Multiple single-mode channels are routed through the MPO assembly to provide simultaneous optical return for multi-fiber testing.
Integrated Channel Routing
The Tx-to-Rx fiber connections are contained within the assembly, keeping the required channel relationship fixed between the MPO interface and the optical return path.
Tx/Rx Channel Mapping
Equipment-Matched Routing
The internal fiber routing is specified to return each Tx channel to its designated Rx channel according to the target MPO port or transceiver configuration.
Fiber Count Matching
The selected fiber count should correspond to the active fiber positions and lane configuration of the MPO port or transceiver under test.
Pinout-Based Verification
Providing the equipment pinout or channel map allows the required Tx-to-Rx assignment to be verified before production.
Configuration Confirmation
The MPO interface, connector gender, fiber count and Tx/Rx channel assignment should be matched to the target port or transceiver before production.
Optical Performance
Loss Budget
The selected insertion-loss level should remain within the optical loss allowance of the equipment or test setup.
Return-Loss Requirement
The specified return-loss level should be matched to the optical interface and test procedure.
Attenuation Matching
An attenuated configuration can be specified when the returned optical power must be controlled within the receiver range of the equipment under test.
Factory Testing
Each finished MPO Single Mode Loopback Cable is inspected and tested against the confirmed product specification before shipment.
Connector Geometry
3D interferometric inspection checks the MPO ferrule geometry against the applicable connector specification.
01
End-Face Condition
Digital microscope inspection checks the connector end face for contamination and visible defects before shipment.
02
Optical Performance
Insertion loss and return loss are measured on the finished assembly at the specified test wavelength.
03
Configuration Verification
The completed assembly is checked against the confirmed connector gender, fiber count and Tx/Rx mapping.
04
Test Documentation
Individual test results can be supplied for orders requiring product-level optical verification.
05
Where the Loopback Fits in the Test Setup
Port-Level Verification: The loopback provides a local return path for checking the Tx/Rx optical path of a compatible MPO interface.
Transceiver Verification: The assembly can serve as the optical return connection when testing an MPO-based transceiver without a remote link partner.
Fault Isolation: Using a defined loopback condition can help separate port or transceiver-related issues from faults associated with external fiber links.
Production Test Fixture: The same configured loopback assembly can be incorporated into repeatable equipment or transceiver test procedures.
FAQ
Q: What is the difference between an MPO loopback cable and a standard MPO fiber cable?
A: A standard MPO cable connects two optical endpoints, while an MPO loopback internally routes Tx channels back to designated Rx channels for local optical testing.
Q: What information should I include in an MPO loopback cable RFQ?
A: Include the target MPO interface or transceiver, connector gender, fiber count, Tx/Rx mapping or pinout, cable length, and attenuation requirement if applicable.
Q: What should I provide if the required MPO loopback pinout is not known?
A: Provide the equipment or transceiver model and any available port specification or channel map so the required Tx-to-Rx routing can be reviewed before production.
Q: How do I select the fiber count for an MPO loopback?
A: Match the fiber count to the active fiber positions and lane configuration of the target MPO port or transceiver.
Q: When is attenuation required in an MPO single mode loopback?
A: Attenuation is used when the returned optical power needs to remain within the receiver range or specified test condition of the equipment under test.
Q: Can an MPO single mode loopback be configured for a specific transceiver or equipment model?
A: Yes. The configuration can be reviewed against the target interface, connector gender, fiber count, and required Tx/Rx channel mapping.
Q: Are high-density MPO configurations available for multi-lane optical transceiver testing?
A: Yes. 16-fiber and 32-fiber Elite Low Loss configurations are available for high-density single-mode test setups requiring multiple parallel optical channels.
Q: Can individual test results be supplied with an MPO loopback cable?
A: Yes. Individual test results can be supplied when product-level optical verification or serial-matched test documentation is required.
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