1. Product Title

4× MPO-12/APC Male to 4× MPO-12/APC Male 32F G657A1 Type B Cable Assembly

2. Product Overview

The GracyFiber 32-fiber MPO/APC cable assembly uses four MPO-12/APC male connectors on each side, with eight active single-mode G657A1 fibers assigned to each MPO interface. The assembly is configured with Type B polarity and Key Up-to-Key Up orientation for parallel single-mode optical connectivity.

3. Key Features

• 32-fiber configuration using four 8-fiber MPO-12/APC interfaces per side
• MPO-12/APC male connectors with single-mode low-loss configuration
• G657A1 single-mode fiber
• Type B polarity
• Key Up to Key Up connector orientation
• Insertion loss ≤0.35 dB
• Return loss ≥60 dB
• Tested at 1310 nm and 1550 nm

Additional mechanical requirements include an APC end-face angle of 8° ±0.2° and connector 3D geometry requirements according to IEC 61755.

4. Applications

• 400G DR4 / DR4+ parallel optical interconnects
• 100G PSM4 optical connectivity
• High-speed optical transceiver testing
• Silicon photonics and optical engine interconnects
• AI data center optical interconnect
• Optical switch and optical test systems
• High-density internal equipment fiber routing

5. Technical Specifications

The product drawing specifies the above optical, mechanical and environmental acceptance requirements.

6. Configuration & Customization Options

Confirmed Configuration

7. Application Scenarios

Application 1 — 400G DR4 / DR4+ Parallel Optical Connectivity

Parallel single-mode optical interfaces such as DR4 use multiple transmit and receive fibers within an MPO interface.

The 8-active-fiber arrangement of this assembly allows each MPO interface to carry a parallel optical path, while the four-group structure provides multiple MPO connections within one cable assembly.

The defined Type B polarity helps maintain controlled fiber routing between the two sides of the interconnect.

Application 2 — Optical Transceiver and Optical Engine Testing

During optical module, photonics or optical engine testing, several parallel optical interfaces may need to be connected simultaneously between the device under test and optical test equipment.

The 4× MPO/APC architecture provides four grouped parallel connections while maintaining identifiable IN/OUT interfaces and defined polarity.

Application 3 — High-Density Equipment Interconnect

Within optical switches, photonic systems and high-density fiber equipment, multiple optical channels may need to be routed through restricted internal space.

The documented configuration uses four Ø0.6 mm G657A1 fiber groups, allowing multiple single-mode optical paths to be organized in one assembly.

8. Why GracyFiber

GracyFiber focuses on passive optical components and fiber interconnect products for optical communication and photonics applications.

Relevant product capabilities include:

• MPO/MTP optical interconnect products
• Fiber Array and FAU products
• Lens Fiber Arrays
• WDM / CWDM / DWDM components
• AAWG products
• PLC and FBT passive optical components
• Polarization-maintaining optical components

For this specific MPO assembly, the production documentation defines fiber routing, connector orientation, optical acceptance criteria and connector end-face requirements. An IL/RL test report is also available for the supplied configuration.

9. Related Products

10. FAQ

What fiber is used in this 32F MPO/APC cable assembly?

The documented configuration uses G657A1 single-mode fiber.

How many active fibers are used in each MPO connector?

Each MPO-12 interface uses 8 active fibers, with four MPO interfaces per side for a total of 32 fibers.

What is the insertion loss specification?

The specified insertion loss is ≤0.35 dB at the stated 1310 nm and 1550 nm test wavelengths. The supplied test report contains measured IL values within the specified limit.

What polarity does the cable use?

The test documentation identifies the cable as Type B, while the mechanical drawing specifies Key Up to Key Up orientation.

Can the connector type, cable length or polarity be customized?

The supplied documents confirm only the current MPO/APC Male, 0.5 m, Type B configuration. For alternative connector gender, length, polarity, fiber count or cable construction, please contact GracyFiber with your required specification.