Fiber Bragg Grating (FBG) Reflector
The FBG Reflector (Fiber Bragg Grating Reflector) functions as a band-pass filter embedded in the optical fiber. It completely reflects test light within a specific wavelength band (typically 1645–1655 nm or 1620–1630 nm) while allowing all other communication wavelengths to pass through with minimal attenuation. When installed at the user-end fiber connection point, it allows network operators to verify link integrity from the central office-a strong reflection indicates a healthy connection, while weak or absent reflection signals a fiber break or fault.
Key Features
| Feature | Description |
|---|---|
| High Reflectivity at Test Band | ≥99.5% reflection at designated wavelength band, approaching total reflection |
| Low Insertion Loss | ≤1.0 dB in pass band, minimizing impact on normal communication signals |
| Grating Embedded in Fiber Core | Written directly into the fiber, immune to contamination, handling, and insertion/removal wear |
| Standard Connector Interface | SC/UPC, SC/APC, LC and others; works with standard adapters for easy deployment |
| Stable and Reliable | Hermetically sealed grating region; designed for long-term passive operation in outdoor and indoor environments |
Technical Specifications
Optical Parameters
| Parameter | Unit | Value |
|---|---|---|
| Pass Band | nm | 1260–1625 |
| Reflect Band | nm | 1645–1655 (or 1620–1630) |
| Insertion Loss (Pass Band) | dB | ≤1.0 (Premium) / ≤1.5 (Standard) |
| Return Loss (Pass Band) | dB | ≥35 (Premium) / ≥30 (Standard) |
| Insertion Loss (Reflect Band) | dB | ≥21 |
| Max Optical Power | dBm | 27 |
Mechanical & Environmental
| Parameter | Unit | Value |
|---|---|---|
| Operating Temperature | °C | -25 to +70 |
| Storage Temperature | °C | -40 to +85 |
| Operating Humidity | RH | 5% to 95% |
| Durability | cycles | ≥500 |
| Connector Type | - | SC, LC (UPC or APC) |
Typical Applications
FTTH / FTTX Network Monitoring: Rapid fault detection and localization in PON networks using OTDR from the central office
PON Link Verification: End-to-end attenuation measurement without affecting live traffic
Unused Fiber Protection: Identify and locate faults on dark fibers in access networks
Compatible with GPON / EPON / 10G-PON / NG-PON: Designed for coexistence with standard PON protocols
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