Gain Flattening Filter
Description
The gain flattening filter (GFF), or gain equalizer (GEQ), is used to compensate for the uneven gain amplification at different DWDM channel by Er-doped fiber amplifier (EDFA). Broptics develops two fiber grating technologies to achieve best price/performance value for customers.
Chirped Fiber Bragg Gratings (CFBG)
Chirped gratings is a sequence of grating periodic change along the transmission axis. By modifying the intensity of grating depth, a matched gain compensation profile can be created. CFBG is able to match the desired profile with minimum errors. Also, Broptics patent-pending athermal package can be applied to resist temperature drift. CFBG is the right choice for high performance EDFA design.
Long Period Gratings (LPG)
Long period gratings differentiate from normal FBG by much wider grating period. The matched wavelength is coupled to cladding mode and absorbed or attenuated. By designing a series of different long gratings, a matched gain compensation profile can be created. Due to its wider period, LPG can be easier made to cover wider bandwidth. By properly select specialty fiber, LPG can be used when cost is the major concern.
Gain Flattening Filter
Specifications |
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|---|---|
| Center Wavelength Range: | 1525-1565nm |
| FBG Length: | Custom |
| Reflectivity: | Not Specified |
Applications
EDFA for DWDM system
ASE Source
Raman Amplifier
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Taiwan
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Frequently Asked Questions
The gain flattening filter is used to compensate for uneven gain amplification at different DWDM channels by an EDFA (Er-doped fiber amplifier).
Broptics uses Chirped Fiber Bragg Gratings (CFBG) and Long Period Gratings (LPG) for their gain flattening filters.
CFBG achieves gain compensation by modifying the intensity of grating depth along the transmission axis, creating a matched gain compensation profile with minimum errors.
LPG has a wider grating period, allowing it to cover a wider bandwidth. It can also be used when cost is a major concern.
The main applications of the gain flattening filter include EDFA for DWDM systems, ASE sources, and Raman amplifiers.