16F MTP® Loopback
The 16-Fiber MTP® Loopback Module is a passive fiber optic test component designed to route transmitted optical lanes back into receiving lanes within a single MTP®-16 interface. It provides a controlled, closed optical return path for port verification, transceiver validation, burn-in testing, and network troubleshooting in high-density parallel optics environments.
This module is specifically engineered for next-generation 400G and 800G networks that utilize MTP®-16 connectors, supporting both singlemode and multimode fiber configurations. The compact push-pull design enables rapid insertion and extraction without additional tooling.
Description
2. Key Features
- 16-fiber MTP® connector supporting 400G/800G parallel optics architectures
- Push-pull coupling mechanism for tool-free insertion and extraction
- Available in Singlemode (OS2, 9/125 um) and Multimode (OM3/OM4, 50/125 um)
- UPC and APC polish options for singlemode; UPC for multimode
- Low insertion loss and high return loss for reliable test accuracy
- Configurable polarity: Type A, Type B, Type C, or custom mapping
- Compact form factor suitable for high-density panel environments
- LSZH (Low Smoke Zero Halogen) housing for enhanced safety
- Compatible with standard MTP® adapters and transceiver interfaces
- Protective dust cap included for end-face contamination prevention
3. Technical Specifications
3.1 General Parameters
| Parameter | Specification |
| Product Type | MTP® Loopback Module |
| Fiber Count | 16 Fibers |
| Connector Type | MTP®-16 (Female / Male available) |
| Connector Gender | Female (no guide pins) by default; Male (with guide pins) optional |
| Polish Type | SM: UPC or APC (8 deg angled); MM: UPC (flat) |
| Fiber Type | Singlemode OS2 (9/125 um) or Multimode OM3/OM4 (50/125 um) |
| Housing Material | LSZH (Low Smoke Zero Halogen) thermoplastic |
| Coupling Mechanism | Push-pull design |
| Dust Cap | Protective dust cap included |
4.2 Optical Performance — Singlemode
| Parameter | Low Loss | Standard | Unit |
| Typical Insertion Loss | 0.35 | 0.50 | dB |
| Maximum Insertion Loss | 0.75 | 1.50 | dB |
| Return Loss (UPC) | >= 50 | >= 50 | dB |
| Return Loss (APC) | >= 60 | >= 60 | dB |
| Operating Wavelength | 1310 / 1550 | 1310 / 1550 | nm |
4.3 Optical Performance — Multimode
| Parameter | Low Loss | Standard | Unit |
| Typical Insertion Loss | 0.20 | 0.35 | dB |
| Maximum Insertion Loss | 0.60 | 0.75 | dB |
| Return Loss | >= 25 | >= 25 | dB |
| Operating Wavelength | 850 / 1300 | 850 / 1300 | nm |
4.4 Environmental Specifications
| Parameter | Specification |
| Operating Temperature | -40 degC to +75 degC |
| Storage Temperature | -40 degC to +85 degC |
| Humidity | 5% to 95% RH (non-condensing) |
| Altitude | Up to 3,000 m |
5. Fiber Mapping & Polarity
The internal fiber mapping of the loopback module routes transmit (TX) lanes back to the corresponding receive (RX) lanes. The exact mapping depends on the selected polarity type and must match the target transceiver architecture.
The following polarity options are available:
Note: For 800G applications using MTP®-16, the typical lane mapping pairs TX lanes 1-8 with RX lanes 9-16 (or the reverse). Always confirm the internal mapping drawing with the supplier before bulk procurement.
6. Standards & Compliance
| Standard | Description |
| IEC 61754-7 | Fibre optic connectors – MTP® connector interface |
| TIA-604-5 | Fiber optic connector intermateability – MTP® type |
| IEC 61300-2 | Basic test and measurement procedures for fiber optic |
| IEC 61300-3-4 | Insertion loss and return loss measurement methods |
| RoHS | Restriction of Hazardous Substances Directive (2011/65/EU) |
| REACH | Registration, Evaluation, Authorisation of Chemicals (EC 1907/2006) |
7. Applications
The 16F MTP® Loopback Module is suitable for a wide range of test and verification scenarios:
| Application | Description |
| Transceiver Testing | Verify TX/RX functionality of 400G/800G MTP®-16 transceivers (QSFP-DD, OSFP) without building a full network link |
| Switch Port Commissioning | Validate MTP® port behavior and signal integrity before live network patching in data center deployments |
| Burn-in / Aging Test | Provide continuous optical loopback for extended equipment reliability and stress testing in factory environments |
| Network Troubleshooting | Isolate equipment-side faults from cabling infrastructure issues during fault diagnosis and resolution |
| Lab Simulation | Create controlled test paths for parallel optics research, protocol validation, and system-level simulation |
| Factory QA / Acceptance | Support repeatable outgoing inspection and acceptance routines for optical equipment manufacturers |
8. Handling & Maintenance
- Always use the protective dust cap when the module is not in use to prevent end-face contamination.
- Inspect the MTP® connector end-face with a fiber inspection scope before each insertion.
- Clean the connector end-face using an MTP®-specific cleaning tool (dry or wet-dry method) if contamination is detected.
- Do not touch the ferrule end-face with bare fingers; skin oils degrade optical performance.
- Store in original packaging in a clean, dry environment within the specified storage temperature range.
- Avoid bending the fiber pigtail (if applicable) below the minimum bend radius of 30 mm.
- After 500 mating cycles, inspect and re-clean the connector before continued use.
9. Ordering Information
To place an order or request a quotation, please specify the following parameters:
| Parameter | Options | Default |
| Fiber Count | 16 | 16 |
| Fiber Type | OS2 (SM), OM3 (MM), OM4 (MM) | OS2 |
| Connector Gender | Female, Male | Female |
| Polish Type | UPC, APC (SM only) | UPC |
| Polarity | Type A, Type B, Type C, Custom | Type A |
| Performance Grade | Standard, Low Loss | Standard |
| Labeling | Standard or custom label | Standard |
| Packaging | Individual bag, tray, bulk | Individual bag |
Part Number Example: MTP®16-LB-[Fiber Type]-[Gender]-[Polish]-[Polarity]-[Grade]
Example: MTP®16-LB-SM-F-UPC-A-STD = 16F MTP® Loopback, Singlemode, Female, UPC polish, Type A polarity, Standard grade
