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Gain
Flattening Filter |
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Specs
Catalog
Inquiry specs |
GFF by Chirped FBG features:
Accurate
gain profile
matching
Reliable
thermal stability
Fast
prototyping
Economic
production
flexibility
GFF by Long Period Gratings features:
Flexible bandwidth
coverage
Better
cost/performance
value
Fast
prototyping
Economic
production
flexibility
Main Applications:
EDFA
for DWDM system
ASE
Source
Raman
Amplifier |
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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. |
| Specification |
Spectral Response |
| Type |
LPG
|
Chirped
FBG |
Wavelength
range
Error function
Thermal stability
Max attenuation
Return loss |
Wide bandwidth
+/- 0.5dB
< 10pm/℃
<15dB
Low |
S & C
+/- 0.25dB
< 1pm/℃
<10dB
High |
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