ConfereA SURVEY ON GAIN FLATTENING IN HYBRID AMPLIFIER IN OPTICAL COMMUNICATION SYSTEMnce
ConfereA SURVEY ON GAIN FLATTENING IN HYBRID AMPLIFIER IN OPTICAL COMMUNICATION SYSTEMnce
ConfereA SURVEY ON GAIN FLATTENING IN HYBRID AMPLIFIER IN OPTICAL COMMUNICATION SYSTEMnce
Abstract
I.
INTRODUCTION
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National Conference on Advancements In Engineering And Technology, Management And Sciences on 23rd April 2016
Fig.1 Block Diagram of EDFA
Pizzinat et al. [2] analyze the effect of EDFA/distributed
Raman amplification WDM system by considering the noise
properties of Raman amplification at high data rate. He
observed that pure Raman amplification let the BER constant
whereas input power decreases to about 6dB.
Paschotta et al. [3] explained that YDFA is likely to find
wider use because of its broad bandwidth and efficient
performance. He also investigated that YDFA offers number of
interesting applications in near future because of its broad
amplification bandwidth.
Moghaddam et al. [4] analyzed the performance of
erbiumytterbium doped fiber amplifier (EYDFA) and
observed that in wavelength range from 1541 to 1565nm using
a multimode pumping at 927nm EYDFA achieve output power
higher than 23dB and flat gain.
Kaler et al. [5] analyze 16, 32 and 64 channel WDM
systems at 10Gb/s with EDFA, Raman and SOA amplifier by
considering the transmission distance and dispersion. He
observed that when dispersion is 2ps/nm/km and channels are
less SOA provide best results and performance drastically
degrades as the as the channels increases. Performance of
EDFA is better than SOA. Raman amplifiers reduce the effect
of non linearities and provide better performance in L-band. In
this paper, we extend the previous work by considering 32
channels for ytterbium amplifier as an in-line-amplifier
II.
EDFA
signal
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National Conference on Advancements In Engineering And Technology, Management And Sciences on 23rd April 2016
40nm
50nm
Noise
Low
Low
Very Low
Polarizati
on
0dB
>few
mW
0dB
Optical
pump
power
20
to
50mw
NA
100 to 500mW
III.
EDFA
SOA
RAMAN
Wavelen
gth
of
operation
15251565nm
Any(But
limited
to<50n
m B.W)
Any,
depend
on
Pump
wavelength
and power
Gain
bandwidt
10
20
20 to 50nm
to
to
[237]
National Conference on Advancements In Engineering And Technology, Management And Sciences on 23rd April 2016
but this leads to an expensive system. For a cost effective
solution, we have optimized the various parameters of a
hybrid EDF-Raman amplifier using a genetic algorithm to
attain better gain flatness [8]. The gain and an NF spectrum of
the optimized EDFA-Raman HOA over a 100 channel DWDM
system. The variation of the gain with wavelength is not
uniform as each amplifier induces its own nonlinearities and
ASE noise. It can be observed that each frequency has a gain
of more than 18 dB. With an optimized HOA, a flat gain
of >18dB>18dB is obtained from a frequency region of 187
to 189.5 THz with a gain variation of less than 1.35 dB
without using any gain flattening technique. The obtained NF
is also the lowest value (<2dB/channel<2dB/channel) ever
reported for a proposed HOA at a reduced channel spacing
(25 GHz).
IV.
References
L-Band
Raman+
Raman+
EDFA+
EDFA
FBG+DCF
Raman+
Raman+
EDFA+
EDFA
DCF
(2013)
[12]
HOA
(2011)
2013
(2011)
[10]
[11]
[9]
Gain
>12dB
>4dB
>10dB
>11dB
Gain
Flatness
~1.2dB
<0.5dB
<4.5dB
<3dB
Number of
channel/cha
nnel
spacing
Channel:3
5
Channels:26
Channel
160
Channel
100
Spacing
Spacing
0.1THz
0.2nm
3.95THz
1.5Thz
Gain
Bandwidth
Spacing:1
nm
23.5nm
80nm
CONCLUSION
[1]
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