Data
sheet
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Multiwavelength
Gain Module -
Mid-stage Access EDFA
Bookham Technology's MultiWavelength Gain Modules are
supplied with the EDFA optical, optoelectronic and
electronic functions built in, requiring only a +5 V power
supply for operation. They allow sophisticated optical
amplifier card level solutions to be implemented very easily.
The MultiWavelength Gain Module optical amplifiers have been
specially designed for use in wide bandwidth WDM optical
transmission systems. The series, consisting of a number of
standard configurations, has been designed to allow rapid
customization to meet the widely varying requirements of
customer specific system design. Each module contains two
amplifier stages providing Mid Stage Access (MSA). This allows
insertion of network components such as add-drop multiplexers,
dispersion compensators while maintaining optimum optical
performance.
Through selection of certain component values within the gain
block, the designs can be rapidly customized to meet specific
amplifier requirements for output power and gain. All of the
amplifiers have an integrated optical output monitor port on
both stages.
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Features
High reliability
Semi-custom design flexibility
Flat optical amplification between
1530 - 1563 nm
Fast gain and transient control
modes
Pre and booster amplifier in a
single package
Internal Variable Optical
Attenuator for constant Mid-Stage
Loss
Single +5 V supply operation
Low power consumption
Low noise figure
Optical output monitor from
both stages
Applications
In-line WDM Amplifier Pair
with Mid-Stage Access (MSA)
Raman Follower
Functional Description
Gain and Transient Control
Each amplifier contains two amplifier stages configured to
operate as a pair with mid stage access. The onboard
digital signal processors continually monitor input and
output powers within each stage and drive the pump
lasers under extremely fast firmware control to provide
constant output power or constant gain with fast transient
suppression.
These features permit wavelengths to be rapidly added or
dropped from the amplifier whilst controlling the impact
on the remaining channels.
Optical
The amplifiers have been optimized for full-band
gain-bandwidth WDM operation by careful selection
of both passive and active components. All amplifiers
are pumped with high reliability 980 nm and 1480 nm
pumps and are all provided with optical monitor outputs
to allow customer spectral analysis or monitoring of the
amplified signal.
Overall midstage loss is kept constant with the inclusion
of a Variable Optical Attenuator located at the output of
the Pre-amplifier stage, following the optical output
monitor tap.
Each attenuator default setting is optimized during
amplifier test to achieve optimum gain flatness at the
specified gain.
Optical amplifier variants optimized for use with high
operating input power levels, compatible with a separate
Raman pump unit, are available.
Electrical
Electrical connection is through a male 50 way connector
for mating with a female connector, type Samtec
SSW-125-01-G-D.
Package
Optical connections are made through single mode fibre
pigtails with SC/PC connectors as standard.
Generic Data
This data sheet indicates generic operating parameters
which can be achieved by the series of amplifiers.
Bookham Technology's flexible approach to design allows
customer specific operating conditions to be catered for
within this range. All parameters specified in the product
tables apply over temperature, wavelength and life unless
otherwise stated.
Optical Parameters
Min
Max
Unit
Generic
Optimized operating wavelength range (variable over)
1530
1563
nm
Case temperature
0
65C
Standard Configurations
MGMFM-2BRC28 -
Line Amplifier
MGMFM-2BEC28 -
Booster Amplifier
MGMFM-2BNC28 -
Line Amplifier
MGMFM-2BDC28 -
Raman Follower
Required Parameters
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Parameter
Min
Typ
Max
Unit
Notes
Operating wavelength
1530.0
1561.5
nm
Calibrated to
of 1540 nm
Optical input power
-5.0
-2.0
dBm
Optical output power
21.0
dBm
-2 dBm input power
Gain
26.0
dB
@ 40C Pre input to Boost output
Noise Figure
5.5
6.3
dB
-5 dBm input power, 1 dB VOA loss,
10 dB interstage loss
Backward ASE
-30
dBm
At typical input power
Total remnant pump at pre-amp IP
-25
dBm
At -5 dBm input power, 26 dB gain
Total remnant pump at pre-amp OP
-25
dBm
At -5 dBm input power, 26 dB gain
Total remnant pump at booster IP
-25
dBm
At -5 dBm input power, 26 dB gain
Total remnant pump at booster OP
-11.0
dBm
At -5 dBm input power, 26 dB gain
Optimum gain flatness
1.5
dB
@ 40C, 21 dBm OP, optimized
with 0 to 2 dB VOA loss
PDG
0.4
dB
At -5 dBm input power, 26 dB gain
PMD
0.5
1.4
ps
Optical power monitors
1.0
2.5
5
%
Optical input return loss
40
dB
Amplifier off
Optical output return loss
40
dB
Amplifier off
Mid stage power at pre output
14.0
dBm
-5 dBm input power, 1 dB VOA loss
Interstage stage loss
10
dB
VOA margin
0.0
1.0
2.0
dB
i.e. 1 dB to achieve OFG
MGMFM-2BRC28 - Line Amplifier
MGMFM-2BEC28 - Booster Amplifier
Parameter
Min
Typ
Max
Unit
Notes
Operating wavelength
1530.0
1561.5
nm
Calibrated to
of 1540 nm
Optical input power
7.0
8.0
dBm
Optical output power
20.5
dBm
7 dBm input power
Gain
13.5
dB
@ 40C Pre input to Boost output
Noise figure
9.0
9.6
dB
7.0 dBm input power, 0.5 dB VOA loss,
7 dB interstage loss
Backward ASE
-30
dBm
At typical input power
Total remnant pump at pre-amp IP
-25
dBm
At 7 dBm input power, 13.5 dB gain
Total remnant pump at pre-amp OP
-25
dBm
At 7 dBm input power, 13.5 dB gain
Total remnant pump at booster IP
-25
dBm
At 7 dBm input power, 13.5 dB gain
Total remnant pump at booster OP
-5.0
dBm
At 7 dBm input power, 13.5 dB gain
Optimum gain flatness
1.5
dB
@ 40C, 20.5 dBm OP, optimized
with 0 to 1 dB VOA loss
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Parameter
Min
Typ
Max
Unit
Notes
PDG
0.4
dB
At 7 dBm input power, 13.5 dB gain
PMD
0.4
1.4
ps
Optical power monitors
1.0
2.5
5.0
%
Optical input return loss
40
dB
Amplifier off
Optical output return loss
40
dB
Amplifier off
Mid stage power at pre output
16.0
dBm
7 dBm input power, 0.5 dB VOA loss
Interstage stage loss
7.0
dB
VOA margin
0.0
0.5
1.0
dB
i.e. 0.5 dB to achieve OFG
MGMFM-2BEC28 - Booster Amplifier continued
Parameter
Min
Typ
Max
Unit
Notes
Operating wavelength
1530.0
1561.5
nm
Calibrated to
of 1540 nm
Optical input power
0.0
4
dBm
Optical output power
21.0
dBm
0.0 dBm input power
Gain
21.0
dB
@ 40C Pre input to Boost output
Noise figure
6.5
7.3
dB
0.0 dBm input power, 0.5 dB VOA
loss, 9 dB interstage loss
Backward ASE
-30
dBm
At typical input power
Total remnant pump at
-25
dBm
At 0.0 dBm input power, 21 dB gain
pre-amp IP
Total remnant pump at
-25
dBm
At 0.0 dBm input power, 21 dB gain
pre-amp OP
Total remnant pump at
-25
dBm
At 0.0 dBm input power, 21 dB gain
booster IP
Total remnant pump at
-6.0
dBm
At 0.0dBm input power, 21 dB gain
booster OP
Optimum gain flatness
1.5
dB
@ 40C, 21 dBm OP, optimized
with 0 to 1 dB VOA loss
PDG
0.4
dB
At 0.0 dBm input power, 21 dB gain
PMD
0.4
1.4
ps
Optical power monitors
1.0
2.5
5.0
%
Optical input return loss
40
dB
Amplifier off
Optical output return loss
40
dB
Amplifier off
Mid-stage power at
16.0
dBm
0.0 dBm input power, 0.5 dB VOA
pre output
loss
Interstage loss
9.0
dB
VOA margin
0.0
0.5
1.0
dB
i.e. 0.5 dB to achieve OFG
MGMFM-2BNC28 - Line Amplifier
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Parameter
Min
Typ
Max
Unit
Notes
Operating wavelength
1530.0
1561.5
nm
Calibrated to
of 1540 nm
Optical input power
3.5
6.5
dBm
Optical output power
20.5
dBm
3.5 dBm input power
Gain
17.0
dB
@ 40C Pre input to Boost output
Noise figure
9.0
10.0
dB
3.5 dBm input power, 0.5 dB VOA loss,
12 dB interstage loss
Backward ASE
-30
dBm
At typical input power
Total remnant pump at pre-amp IP
-25
dBm
At 3.5 dBm input power, 17 dB gain
Total remnant pump at pre-amp OP
-25
dBm
At 3.5 dBm input power, 17 dB gain
Total remnant pump at booster IP
-25
dBm
At 3.5 dBm input power, 17 dB gain
Total remnant pump at booster OP
-7.0
dBm
At 3.5 dBm input power, 17 dB gain
Optimum gain flatness
1.7
dB
@ 40C, 20.5dBm OP, optimized with
0 to 1dB VOA loss
PDG
0.4
dB
At 3.5 dBm input power, 17 dB gain
PMD
0.5
1.4 ps
Optical power monitors
1.0
2.5
5
%
Optical input return loss
40
dB
Amplifier off
Optical output return loss
40
dB
Amplifier off
Mid stage power at pre output
16.0
dBm
3.5 dBm input power, 0.51 dB VOA loss
Interstage loss
12
dB
VOA margin
0
0.5
1.0
dB
i.e. 0.5 dB to achieve OFG
The Raman Follower has been designed to operate with a separate Raman Pump Unit for Ultra Long Haul applications.
The specification detailed below is typical for the Raman gain spectrum as shown in the example below. Other Raman input
spectra can be considered when designing matching amplifiers.
MGMFM-2BDC28 - Raman Follower
Example Raman Gain (dB) Spectrum
-16
-14
-12
-10
-8
-6
-4
-2
0
1525
1530
1535
1540
1545
1550
1555
1560
1565
Wavelength (nm)
Ga
in
(
d
B
)
Figure 1: Raman Gain (dB) Spectrum
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