SM & PM Mode Field Diameter (MFD) Fiber Array for Silicon Photonics & PIC Coupling

The GracyFiber Mode Field Diameter (MFD) Fiber Array is a precision fiber array designed for low-loss and efficient optical coupling in photonic integration and packaging applications. By controlling the mode field diameter, fiber pitch, and facet geometry, the MFD Fiber Array supports accurate optical mode matching between fibers and photonic devices.

• SM and PM MFD Fiber Array configurations
• 1310 nm / 1550 nm operating wavelength
• Controlled mode field diameter for optical mode matching
• Multiple MFD options with customized MFD available
• 1–48 channel configurations according to product configuration
• Multiple fiber pitch and facet geometry options
• Lid and lidless configurations
• Multiple connector and fiber coating options
• Standard or customized FA dimensions

The source specifically highlights precise MFD control, optimized coupling efficiency, low insertion loss, high return loss, SM/PM fiber support, and flexible packaging and connectivity.

• Silicon Photonics & PIC Coupling
• 800G / 1.6T Optical Transceiver Multi-Channel Coupling
• Coherent Optical Communication Systems
• Quantum Communication and QKD
• Optical Sensing
• Biomedical Imaging

These applications are explicitly listed in the supplied MFD Fiber Array documentation.

Because the supplied documentation defines different specifications for PM MFD Fiber Array and SM MFD Fiber Array, they are separated below.

The PM specification table is provided on page 3 of the supplied document.

The SM specification table on page 4 extends the channel configurations through 48 channels.

• SM configuration
• PM configuration

• 1310 nm
• 1550 nm

PM:
1 / 2 / 4 / 8 / 12 / 16 / 24 / 32 channels

SM:
1 / 2 / 4 / 8 / 12 / 16 / 24 / 32 / 48 channels

Standard listed values:

• 6.0 μm
• 7.5 μm
• 9.0 μm

Customized range:

• PM: 3.3–10 μm
• SM: 2.6–10 μm

Available listed configurations include:

• 250 μm
• 127 μm
• 127 / 250 μm

Available configurations include:

• 8°
• 41°
• 82°
• 90°
• 12°
• 21°
• Customized angles

• A Type
• V Type

• Lid
• Lidless

• Pyrex
• Tempax
• Quartz
• Silicon

• 250 μm
• 900 μm loose tube
• Ribbon

• FC
• LC
• SC
• E2000
• MT
• MPO
• MMC

• 100 ±10 cm
• Customized length

• Standard
• Customized

These options are supported directly by the supplied specification tables.

The GracyFiber MFD Fiber Array is designed for optical interfaces where the mode field of the fiber needs to be matched more closely to the optical mode of a photonic device. Rather than treating the fiber array only as a mechanical multi-fiber alignment component, the MFD FA combines controlled mode field diameter, fiber pitch, facet geometry, and fiber-array structure to support efficient and repeatable optical coupling.

For silicon photonics and photonic integrated circuit packaging, the optical mode supported by the chip-side coupling interface may differ from that of a conventional transmission fiber. The available 6.0 μm, 7.5 μm and 9.0 μm MFD values, together with customized MFD ranges, allow the fiber-side optical interface to be configured according to the coupling architecture.

The product also supports multiple polish angles and both A-Type and V-Type facet geometries. These options allow the mechanical and optical interface to be adapted to different photonic packaging structures rather than relying on a single standard fiber-array geometry.

For polarization-sensitive applications, the PM configuration adds defined slow/fast-axis reference, selectable axis orientation, specified alignment accuracy, and PER requirements. The supplied PM specification lists a PER of ≥16 dB with a typical value of ≥18 dB.

The combination of channel-count, pitch, MFD, facet, lid, coating, connector, and dimensional options allows the MFD Fiber Array to be configured for different multi-channel photonic coupling architectures.

In silicon photonics packaging, the MFD Fiber Array provides a controlled multi-channel fiber interface between the external optical fiber system and the photonic integrated circuit.

The available MFD, pitch, facet angle, and FA geometry options allow the fiber array to be configured around the optical and mechanical coupling architecture of the PIC. The supplied specifications specifically identify the product as optimized for improved coupling efficiency to SiPh / PIC devices.

High-channel-count optical transceivers require several optical paths to be coupled and aligned within a compact package.

The MFD Fiber Array supports multi-channel configurations and is explicitly identified in the supplied documentation for 800G / 1.6T optical transceiver multi-channel coupling.

SM configurations extend to 48 channels according to the specification table, while the PM table currently lists configurations through 32 channels.

The PM MFD Fiber Array is relevant where optical coupling must also maintain a defined polarization orientation.

Its PM specification includes slow-axis / fast-axis reference, 0° / 45° / 90° or customized axis orientation, axis alignment accuracy of ≤±2° with typical ±1°, and PER ≥16 dB.

GracyFiber supplies passive optical components and precision fiber interconnection products for photonics and optical communication applications.

For MFD Fiber Arrays, the supplied product specification supports configuration of key optical and mechanical parameters including:

• Mode field diameter
• Channel count
• Fiber pitch
• Polish angle
• Angle type
• Fiber type
• Fiber coating
• Connector
• Fiber length
• Lid / lidless structure
• Fiber array dimensions
• PM axis orientation

GracyFiber's related product portfolio also includes SM Fiber Arrays, PM Fiber Arrays, Lens Fiber Arrays, FAUs, MPO/MTP assemblies, WDM components, and PM passive components, allowing engineers to evaluate related fiber coupling and optical interconnection architectures within the same product portfolio.

An MFD Fiber Array is a fiber array in which the mode field diameter is controlled to support optical mode matching between the fiber interface and the connected photonic device.

The supplied GracyFiber MFD FA specification combines MFD control with configurable fiber pitch and facet geometry for photonic integration and packaging applications.

The listed standard MFD values are:

• 6.0 μm
• 7.5 μm
• 9.0 μm

For customized configurations, the supplied specification lists:

• PM MFD FA: 3.3–10 μm
• SM MFD FA: 2.6–10 μm

The specified MFD tolerance is ±0.5 μm, with a typical value of ±0.3 μm.

The SM MFD Fiber Array is configured for single-mode optical coupling, while the PM MFD Fiber Array includes additional polarization-related parameters.

The PM specification defines:

• PER ≥16 dB, Typical ≥18 dB
• Slow-axis / fast-axis reference
• 0° / 45° / 90° / customized orientation
• Axis alignment accuracy ≤±2°, Typical ±1°

According to the specification tables:

PM MFD Fiber Array:
1 / 2 / 4 / 8 / 12 / 16 / 24 / 32 channels

SM MFD Fiber Array:
1 / 2 / 4 / 8 / 12 / 16 / 24 / 32 / 48 channels

The product overview separately states support for 1–48 channels, so PM 48-channel availability should be confirmed before it is published as an available PM configuration.

Yes. The supplied specification explicitly provides customized MFD, polish angle, fiber length, FA dimensions, and other configurable options. Connector choices listed include FC, LC, SC, E2000, MT, MPO, and MMC.

For quotation, please provide the required channel count, wavelength, target MFD, fiber pitch, polish angle, fiber type, connector, fiber length, and photonic coupling interface.