Multicore Fiber (MCF) Interconnect · Space-Division Multiplexing (SDM)
7-Core Fiber Fan-In Fan-Out (FIFO) Device
OptoWeave's 7-core fan-in fan-out (FIFO) device provides low-loss, low-crosstalk optical coupling between a 7-core multicore fiber (MCF) and seven individual single-mode fibers terminated in FC/APC connectors. Built for space-division multiplexing (SDM) networks, multicore fiber sensing, and next-generation optical interconnects, it delivers ≤1.0 dB insertion loss, ≥45 dB return loss and ≤-45 dB inter-core crosstalk at the 1550 nm telecom wavelength.
- ≤1.0 dB Insertion Loss
- ≥45 dB Return Loss
- ≤-45 dB Crosstalk
- 1550 nm Wavelength
- 7-Core MCF, 42.0±1.0 µm Pitch
Key Features of the 7-Core MCF Fan-In Fan-Out Device
- Low insertion loss ≤1.0 dB across all seven coupling channels
- High return loss ≥45 dB for minimal optical back-reflection
- Ultra-low inter-core crosstalk ≤-45 dB between adjacent cores
- Bidirectional operation — fans in single-core fibers to the MCF or fans out the MCF to single-core fibers
- Single-core pigtails in bend-insensitive G.657.A2 fiber, terminated in FC/APC connectors
- Rugged Φ5.5 mm steel-tube package, 100 mm in length, for stable field deployment
- Matched to 7-core MCF with 42.0±1.0 µm core pitch
- Operates at the 1550 nm telecom wavelength
Product Structure Diagram
Schematic structure diagram. Dimensions correspond to the mechanical specification table below (L1–L4, D1–D3). Replace with the vector production drawing if a native file is available — see import notes at the end of this page.
Optical Performance Specifications
| Item | Symbol | Unit | Specification |
|---|---|---|---|
| Operating Wavelength | λ | nm | 1550 |
| Insertion Loss | IL | dB | ≤1.0 |
| Return Loss | RL | dB | ≥45 |
| Inter-Core Crosstalk | XT | dB | ≤-45 |
Mechanical Specifications
| Category | Item | Symbol | Unit | Specification |
|---|---|---|---|---|
| Multicore Fiber & Connector | Fiber Type | / | / | 7-core fiber |
| Core Pitch | / | µm | 42.0±1.0 | |
| Mode Field Diameter | / | µm | / | |
| Fiber Length | L2 | m | 2.0±0.1 | |
| Fiber Loose Tube | D2 | mm | White, Φ0.9 | |
| Loose Tube Length | L4 | m | 0.5±0.1 | |
| Connector Type | / | / | / | |
| Single-Core Fiber & Connector | Fiber Type | / | / | G.657.A2 |
| Fiber Length | L1 | m | 1.5±0.1 | |
| Fiber Loose Tube | D1 | mm | White, Φ0.9 | |
| Loose Tube Length | L1 | m | 1.5±0.1 | |
| Connector Type | / | / | FC/APC | |
| Package | Package Form | / | / | Steel tube |
| Package Diameter | D3 | mm | Φ5.5 | |
| Package Length | L3 | mm | 100 |
Applications
SDM Optical Networks
Bridges 7-core MCF trunk lines with standard single-core telecom equipment in space-division multiplexing (SDM) systems.
Multicore Fiber Sensing
Interfaces individual cores of an MCF for distributed shape, strain, bend and temperature sensing.
Data Center Interconnects
Increases per-fiber capacity in high-density interconnects without adding cable count.
Optical Test & Measurement
Enables per-core insertion loss, return loss and crosstalk characterization of multicore fiber links.
Research & Photonic Labs
Provides a standard FC/APC interface for MCF experiments in university and R&D optics labs.
Custom OEM Modules
Integrates into transceivers, sensing heads and subsystems requiring compact MCF fan-in fan-out access.
Frequently Asked Questions
What is a fan-in fan-out (FIFO) device used for?
A fan-in fan-out (FIFO) device connects the multiple cores of a multicore fiber (MCF) to individual single-core fibers, so that standard single-mode components, connectors and test equipment can be used with MCF-based systems.
What is the difference between fan-in and fan-out?
Fan-in combines light from several individual single-core fibers into the separate cores of one MCF. Fan-out does the reverse, splitting the cores of an MCF back out into individual single-core fibers. The same device performs both functions depending on the direction of use.
What insertion loss and crosstalk can I expect from this 7-core device?
This 7-core fan-in fan-out device is specified for insertion loss ≤1.0 dB, return loss ≥45 dB and inter-core crosstalk ≤-45 dB, measured at 1550 nm.
What connector type is used on the single-core fiber side?
The single-core side is terminated in FC/APC connectors on G.657.A2 bend-insensitive fiber, with a 1.5±0.1 m pigtail length.
Can the fiber length, core count or connector type be customized?
Yes. Opticlumos supports custom pigtail lengths, alternate connector types and other core counts beyond 7-core MCF. Contact our sales engineers with your target specification.
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