Specific Application FBG
FBG WDM ITU Filter 100/200GHZ
ARTICLE GTL-FBG-WDM-810
FBGs with narrow spectral bandwidth are good elements for filtering optical signals. Such FBGs are widely used as optical add/drop multiplexer in WDM systems. High level of SLSR is allowed to avoid adjacent channel crosstalk in systems. A flat – top reflection spectrum and steep spectral roll-down are a feature these FBGs. Athermal packaging FBG with wavelength stability < 0.16 nm for temperature range 0-70 ⁰C is required for stable operation
FBG CHARACTERISTICS | ARTICLE GTL-FBG-WDM-810 | TOLERANCE/NOTE |
| Wavelength range, nm | 1530nm-1565nm (C Bands), or custom 1510nm-1580nm | ± 0.1 |
| Types of fiber | Corning SMF-28 | or custom |
| Reflectivity, % | 10% to 99%, Flat-top typical > 99.5% | 2 ÷ 5 |
| Bandwidth (FWHM), nm | 100/200 GHz on ITU. For 100GHz: at level -0.5 dB > 0.3 nm and at -20 dB is 0.65 nm | or custom |
| Channel Isolation, dB | › 20 |
|
| Insertion Loss , dB | < 0.15 |
|
| Cladding Mode Loss, dB | ‹ 0.5 (only for cladding mode suppressed fiber) | custom |
| FBG Pigtail Length, m | ≥ 0.5 | or custom |
| FBG Recoating | None, Acrylate, Polyimide | or custom |
| Thermal Wavelength stability (0 ÷ +70 ֩C), nm | < 0.16 |
|
| Optical Connector | Bare fiber, FC/APC, LC/APC | or custom |
| Thermal Package | 66mm x 18mm x 12mm |
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