The MPO Loopback Test Module is a factory-assembled multi-fiber optical component designed to provide an internal optical return path through an MPO interface.
Technical Specifications
|
Parameter |
Specification |
|
Product Type |
MPO Loopback Test Module |
|
Connector Type |
MPO |
|
Fiber Count |
8 / 12 / 16 / 24 Fibers |
|
Fiber Mode |
OS2 Single Mode / OM3 / OM4 / OM5 Multimode |
|
Connector Polish |
PC / APC |
|
Polarity Mapping |
Type A / Type B / Type C / Customized |
|
Connector Gender |
Male (with pins) / Female (without pins) |
|
Insertion Loss |
Standard Loss ≤ 0.60 dB / Low Loss ≤ 0.35 dB |
|
Return Loss |
≥ 35 dB Multimode / ≥ 60 dB Single Mode APC |
|
Test Wavelength |
Single Mode: 1310 / 1550 nm; Multimode: 850 / 1300 nm |
|
Attenuation |
1–10 dB, optional |
|
Durability |
≥ 500 Mating Cycles |
|
Standards |
IEC 61754-7 / TIA-604-5 / Telcordia GR-1435-CORE |
|
Environmental Compliance |
RoHS / REACH |
|
Operating Temperature |
-20°C to +70°C |
|
Storage Temperature |
-40°C to +85°C |
|
Interface Compatibility |
QSFP / QSFP28 / QSFP-DD / OSFP |
Loopback Design
Internal Fiber Routing
Internal fibers connect designated MPO channels to create the optical return path within the module.
TX-to-RX Mapping
The internal channel mapping defines how transmitted signals are returned to the corresponding receiving channels.
MPO Interface
The loopback path terminates within the MPO interface, allowing the return connection to be established through a single connector interface.
Channel Assignment Check
The loopback configuration is checked against the transmit and receive lane assignment of the target MPO interface before production
Optical Performance
Loss Control: The specified loss grade defines the optical loss introduced by the loopback path, allowing the total test condition to be checked against the allowable optical loss.
Controlled Attenuation: Internal attenuation can be introduced when the test requires a defined optical loss instead of a direct low-loss return path.
Quality Control
End-Face Inspection
MPO connector end faces are inspected by digital microscopy for contamination, scratches, and other visible defects before shipment.
01
Ferrule Geometry
MPO ferrule geometry is checked by interferometric measurement for fiber height, radius of curvature, and apex offset.
02
Optical Testing
Each assembly undergoes insertion-loss and return-loss testing, with 100% IL/RL testing specified for the product.
03
Routing Verification
Internal fiber routing is checked against the specified channel mapping to verify the completed loopback path.
04
Test Documentation
Individual optical performance test data can be supplied with shipments for traceability against the confirmed product specification.
05
Custom Options
Interface Matching
The connector gender and end-face configuration are confirmed against the mating MPO interface before production.
Channel Mapping
The TX-to-RX relationship is confirmed against the required MPO lane assignment before production.
Optical Loss
The loss grade and any internal attenuation are confirmed against the required test condition before production.
Identification
Part numbers, labels, and barcodes can be applied to match the customer's inventory or traceability system.
Factory Production
Direct Manufacturing: DIMI manufactures MPO/MTP fiber optic assemblies in-house for sample development and volume production.
Sample Production: Standard samples for the MPO Loopback Test Module are typically produced within 3–5 working days.
Engineering Documentation: Technical datasheets and product drawings can be provided by the DIMI engineering team for specification review before production.
FAQ
Q: What can an MPO Loopback Test Module be used to test?
A: An MPO Loopback Test Module provides an optical return path for checking compatible optical ports, transceivers, and optical equipment by returning transmitted channels to their designated receive positions.
Q: What is the difference between an MPO Loopback Test Module and an MPO Loopback Cable?
A: An MPO Loopback Test Module integrates the optical return path within the module, while an MPO Loopback Test Cable uses a cable assembly to establish the return connection. The appropriate format depends on the physical interface and test configuration.
Q: Does MPO interface compatibility depend on the transceiver configuration?
A: Yes. Physical mating depends on the MPO connector configuration, while optical compatibility also depends on the fiber mode, channel assignment, and lane configuration of the equipment under test.
Q: What is the MOQ for MPO Loopback Test Modules?
A: The standard MOQ is 500 pcs per configuration.
Q: Can I order samples before placing a bulk order?
A: Yes. Samples can be produced for technical evaluation and compatibility verification before a volume order is placed.
Q: What payment terms are available for MPO Loopback Test Module orders?
A: DIMI accepts T/T and L/C for MPO Loopback Test Module orders. Payment terms and the applicable payment schedule are confirmed with the quotation according to the order requirements.
Q: How are MPO Loopback Test Modules packaged for shipment?
A: Each MPO Loopback Test Module is individually packed to protect the MPO interface from contamination and handling damage, then packed in cartons for shipment. Product labels and applicable test documentation are included according to the confirmed order requirements.
Q: How can I request a quotation for MPO Loopback Test Modules?
A: A quotation can be prepared after the required fiber mode, fiber count, connector configuration, polarity or channel mapping, optical loss condition, and order quantity are provided for technical and commercial confirmation.
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