1650nm Bidirectional OTDR FBG Reflector SC/APC at Low Insertion Loss-ARTIC FIBER TECHNOLOGY

1650nm Bidirectional OTDR FBG Reflector SC/APC at Low Insertion Loss

The FBG reflector is a standard SC type connector structure, which package a special FBG in the ceramic ferrule. The fiber bragg grating reflector is a low-cost specific band reflector mounted on the optical network unit (ONU) side. It can reflect light pulses (1650 +/- 5 nm) from the OTDR on the fiber line terminal (OLT) side nearly 100%, while the working bands of the passive optical network (PON) are transmitted normally. The OTDR can determine whether the fiber line is normal by detecting the signal reflected by the fiber grating reflector. When the reflected signal is lower than the normal value, the line loss is too large; when the reflection value is 0, the optical fiber line is broken. Therefore, we can maintain the fiber line in time by the real-time monitoring of the fiber line.

Why Use a 1650nm FBG Reflector?

Traffic-Safe Testing:

1650nm is outside the C/L-band (1530nm–1625nm), preventing interference with DWDM systems.

Bidirectional Efficiency:

Eliminates the need for two reflectors (one per direction), reducing cost and complexity.

High Precision:
FBG's sharp reflection peak improves OTDR trace clarity vs. broadband mirrors.

Integration Guidelines
Placement: Install at the far end of the fiber link or at splice points.

Compatibility: Works with standard SC/APC OTDR test ports.
Avoid Mismating: Never connect to UPC ports (physical damage risk).

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✔ Wavelength: 1650nm
Dedicated to OTDR (Optical Time-Domain Reflectometer) testing, avoiding interference with live traffic (1310/1550nm systems).

✔ Bidirectional Operation:
Reflects OTDR signals from both directions, enabling comprehensive fiber link characterization.

✔ FBG (Fiber Bragg Grating) Technology:
Narrowband reflection peak at 1650nm (±0.5nm), filtering out other wavelengths.
High return loss (>14dB) for accurate fault detection.

✔ Connector: SC/APC (Green)
Angled polish minimizes back reflections (<-65dB).
Low Insertion Loss: <0.5dB (typical)
Minimizes signal attenuation during testing.

✔ Compact Design:
Typically housed in a 1x1 port module or inline splice-on configuration.

✔ High stability and reliability;
✔ Remote real-time detection;
✔ Low insertion loss;
✔ Easy connection foradapter structure;
✔ Compliant with Telcordia GR-326-CORE, Telcordia GR-1221-CORE;
✔ Compliant withRoHS.

✔ OTDR Calibration & Reference:
Provides a known reflection point for distance/loss measurements.

✔ Live Fiber Monitoring:
Safely tests fibers without disrupting active 1310/1550nm traffic.

✔ PON/FTTH Troubleshooting:
Identifies faults (breaks, bends, splices) in GPON/XPON networks.
Data Center & Long-Haul Fiber Certification:
Validates splice quality and end-to-end loss.

FAQ

Q: Can I use this with a 1625nm OTDR?
A: Yes, but reflection efficiency may drop slightly (FBG has a narrow bandwidth).

Q: Is it reusable?
A: Yes, if connectorized (SC/APC). Splice-on variants are permanent.

Q: Insertion loss too high?
A: Check for connector contamination or replace with a ultra-low-loss FBG (<0.2dB).

Q: Vendors?
A: Thorlabs, AFL, FS.com, and OZ Optics offer reliable FBG reflectors.

Detection and maintenance of Passive Optical Network lines (applied to FTTx).