The end‑customer is a United‑States‑based high‑tech enterprise specializing in interferometric fiber‑optic sensing solutions. The customer undertakes large‑scale structural health monitoring and perimeter vibration sensing projects, requiring massive quantities of high‑reliability 3*3 polarization‑maintaining fused couplers.
Conventional single‑mode 3*3 couplers bring obvious polarization fading issues in field‑deployed sensing systems, which deteriorate signal contrast and trigger excessive false alarms. To guarantee long‑term system stability in complex outdoor working conditions, the customer selected PANDA‑fiber‑based 3*3 polarization‑maintaining fused couplers. The inherent 2π/3 phase difference among three output ports supports passive phase demodulation, removing the need for complicated active compensation circuits.
| Item | Specification Requirement |
|---|---|
| Device | 3*3 Polarization‑Maintaining Fused Biconical‑Taper Coupler |
| Operating Wavelength | 1550 nm |
| Splitting Ratio | 33:33:33 (±3 %) |
| Fiber Type | PANDA PM1550 polarization‑maintaining fiber |
| Working Axis | Slow‑axis operation |
| Extinction Ratio | ≥17 dB |
| Excess Loss | ≤1.0 dB |
| Return Loss | ≥55 dB |
| Package & Connector | φ3.0 mm metal tube package, FC‑APC for all ports |
| Reliability Standard | Compliant with Telcordia GR‑1221‑CORE reliability requirements |
| Environmental Resistance | Pass −40 °C ~ +85 °C temperature cycling test |
| Order Quantity | 3600 units |
| Application Scenario | Field‑deployed fiber‑optic interferometric sensing system for structural health and perimeter vibration monitoring |
We delivered total 3600 units of 3*3 PM fused couplers manufactured by advanced fused‑biconical‑taper process for PM fiber. Precision slow‑axis alignment was implemented throughout production to secure consistent extinction ratio and well‑balanced splitting performance.
Every batch underwent full optical parameter testing and environmental screening prior to export shipment. Strict batch consistency control was enforced for this high‑volume order to avoid parameter divergence among mass‑produced devices.
After goods arrival in the US, the customer performed incoming inspection and system integration:
Main Component: The coupler body consists of a central metal steel pipe. This pipe shall be secured horizontally. Bending or compression of the pipe is strictly prohibited.
Cable Terminations
Connector Mating: Insert each FC‑APC plug into the corresponding optical port of the equipment, then fasten the locking nut.
This large‑volume export project of 3600 pieces of 3*3 polarization‑maintaining fused couplers delivered clear technical and commercial value for the U.S. system integrator. By replacing single‑mode 3*3 couplers with high‑consistency PM fused components, the customer resolved the long‑standing polarization‑fading pain point for outdoor interferometric sensing networks. The passive demodulation characteristic of the 3*3 architecture helped reduce electronic circuit complexity, lowered overall system power consumption, and enhanced equipment robustness for multi‑year unattended field operation.
For component suppliers, this case demonstrates that mass‑produced polarization‑maintaining fused couplers can meet strict international reliability standards such as Telcordia GR‑1221‑CORE, not only for small‑quantity university laboratory research, but also for thousands‑level commercial deployment projects. System designers building interferometric fiber‑optic sensors, perimeter intrusion detection systems, structural health monitoring platforms, fiber‑optic hydrophone arrays or fiber‑optic gyroscope subsystems should evaluate 3*3 PM fused couplers when polarization stability and passive phase demodulation are core design priorities.
As fiber‑optic interferometric sensing continues expanding in North America and global markets, demand for high‑volume, traceable, reliability‑validated PM passive optical components will keep growing. This U.S. export project serves as a practical real‑world reference for component selection, specification definition, mass‑production risk control and cross‑border technical cooperation.
The end‑customer is a United‑States‑based high‑tech enterprise specializing in interferometric fiber‑optic sensing solutions. The customer undertakes large‑scale structural health monitoring and perimeter vibration sensing projects, requiring massive quantities of high‑reliability 3*3 polarization‑maintaining fused couplers.
Conventional single‑mode 3*3 couplers bring obvious polarization fading issues in field‑deployed sensing systems, which deteriorate signal contrast and trigger excessive false alarms. To guarantee long‑term system stability in complex outdoor working conditions, the customer selected PANDA‑fiber‑based 3*3 polarization‑maintaining fused couplers. The inherent 2π/3 phase difference among three output ports supports passive phase demodulation, removing the need for complicated active compensation circuits.
| Item | Specification Requirement |
|---|---|
| Device | 3*3 Polarization‑Maintaining Fused Biconical‑Taper Coupler |
| Operating Wavelength | 1550 nm |
| Splitting Ratio | 33:33:33 (±3 %) |
| Fiber Type | PANDA PM1550 polarization‑maintaining fiber |
| Working Axis | Slow‑axis operation |
| Extinction Ratio | ≥17 dB |
| Excess Loss | ≤1.0 dB |
| Return Loss | ≥55 dB |
| Package & Connector | φ3.0 mm metal tube package, FC‑APC for all ports |
| Reliability Standard | Compliant with Telcordia GR‑1221‑CORE reliability requirements |
| Environmental Resistance | Pass −40 °C ~ +85 °C temperature cycling test |
| Order Quantity | 3600 units |
| Application Scenario | Field‑deployed fiber‑optic interferometric sensing system for structural health and perimeter vibration monitoring |
We delivered total 3600 units of 3*3 PM fused couplers manufactured by advanced fused‑biconical‑taper process for PM fiber. Precision slow‑axis alignment was implemented throughout production to secure consistent extinction ratio and well‑balanced splitting performance.
Every batch underwent full optical parameter testing and environmental screening prior to export shipment. Strict batch consistency control was enforced for this high‑volume order to avoid parameter divergence among mass‑produced devices.
After goods arrival in the US, the customer performed incoming inspection and system integration:
Main Component: The coupler body consists of a central metal steel pipe. This pipe shall be secured horizontally. Bending or compression of the pipe is strictly prohibited.
Cable Terminations
Connector Mating: Insert each FC‑APC plug into the corresponding optical port of the equipment, then fasten the locking nut.
This large‑volume export project of 3600 pieces of 3*3 polarization‑maintaining fused couplers delivered clear technical and commercial value for the U.S. system integrator. By replacing single‑mode 3*3 couplers with high‑consistency PM fused components, the customer resolved the long‑standing polarization‑fading pain point for outdoor interferometric sensing networks. The passive demodulation characteristic of the 3*3 architecture helped reduce electronic circuit complexity, lowered overall system power consumption, and enhanced equipment robustness for multi‑year unattended field operation.
For component suppliers, this case demonstrates that mass‑produced polarization‑maintaining fused couplers can meet strict international reliability standards such as Telcordia GR‑1221‑CORE, not only for small‑quantity university laboratory research, but also for thousands‑level commercial deployment projects. System designers building interferometric fiber‑optic sensors, perimeter intrusion detection systems, structural health monitoring platforms, fiber‑optic hydrophone arrays or fiber‑optic gyroscope subsystems should evaluate 3*3 PM fused couplers when polarization stability and passive phase demodulation are core design priorities.
As fiber‑optic interferometric sensing continues expanding in North America and global markets, demand for high‑volume, traceable, reliability‑validated PM passive optical components will keep growing. This U.S. export project serves as a practical real‑world reference for component selection, specification definition, mass‑production risk control and cross‑border technical cooperation.
