BOOKHAM LMC10NEJ 10gb/s compact inp mz modulator with dwdm laser Datasheet

Data Sheet
10Gb/s Compact InP MZ Modulator
with DWDM Laser
LMC10NEJ
Negative Chirp - High Power
The LMC10NEJ product, containing the Bookham Ultra High
Power Strained Layer DFB laser chip and negative chirp InP
MZ modulator, has been specifically designed for use in 10
Gb/s high performance regional metro and long haul DWDM
systems. By co-packaging the laser, locker, modulator, VOA
and power monitor in a package with the same footprint area
as the industry standard 14-pin, the LMC10 series provides
Mach-Zehnder performance at a price similar to lower
performance alternatives. The internal power monitor and
optical attenuator allow fibre power stabilisation over life and
temperature. In addition the power tap offers the option of MZ
bias point optimisation for best transmitted optical waveform
over life. The high output power, integral wavelength locking
and high extinction ratio provides excellent OSNR to allow the
device to be employed on multi-span long haul links.
Features:
• Mean modulated power >+3dBm over life
and temperature
• Short term power stability <+/-0.5dB using
control loops
• Negative Chirp (up to 1600ps/nm applications)
• Co-planar differential RF drive ≤ 2.7 volts
• Suitable for 50GHz ITU applications with +/-20pm λ
accuracy over life
• Low Power Dissipation
• Industry Standard 14-pin footprint area
• Pins on one side to allow increased system density
• C and L band
• Unrivalled performance vs size
• Qualified to Telcordia GR-468 CORE
• RoHS 5/6 compliant
Applications:
• 10Gb/s Long Haul DWDM Multi span dispersion
compensated links
• Regional Metro single spans with no
dispersion compensation
• 10Gb/s Overlay for Metro Networks
• LR2 compliant Transponders
• 2.5Gb/s Long Haul DWDM Multi span non
dispersion compensated links
1
Data Sheet
Using the LMC10NEJ
The LMC10NEJ can be used in two ways:
Mode 1.
Dynamic MZ modulator arm DC bias control, the Power Tap and VOA can be used in a control loop to stabilise short term power
variation. The optical crossing point is tightly controlled.
Mode 2.
Fixed MZ modulator arm DC bias, the Power Tap and VOA can be used in a control loop to stabilise short term power variation.
Further details relating to modes 1 and 2 are given later in this data sheet.
Characteristics
Parameter
Conditions
Min
Typ
Max
Unit
75
°C
5
dBm
0.5
dB
Module and Modulator Parameters
Case temperature
[Tcase]
Modulated output power
External temperature of Tx case
[1]
3
EOL over temperature [2] [3]
4
-0.5
Modulated output power short term tracking
2
-5
10
AC extinction ratio
EOL, 10.709Gb/s
Dispersion penalty over temperature
10.709Gb/s, 1600ps/nm, EOL [5]
Data bar arm bias
<9mA arm bias current
Data arm bias
<9mA arm bias current
Modulation drive voltage
per arm, pk-pk, 10.709Gb/s
Optical rise time, fall time
[4]
dB
11.5
2
dB
-4
-1.1
V
-2.2
-0.5
V
1.8
2.7
V
20% - 80%
35
ps
Tolerable link optical reflection
[7]
-14
dB
Output optical return loss
[8]
20
Optical crossing level [Mode 1]
[9]
48
Optical crossing level [Mode 2]
[10]
40
Modulator bandwidth
S21, -3dB
10
[6]
dB
50
52
%
60
%
GHz
Data Sheet
Characteristics (continued)
Parameter
Conditions
Min
Typ
Max
Unit
360
mA
-35
35
mA
20
85
mA
2.3
V
20
MHz
Laser Source Parameters
Laser forward current EOL
Change in laser forward current
C & L-Band. Wavelength locked
From SOL to EOL
Laser threshold current EOL
Laser forward voltage
EOL at locked wavelength
Laser linewidth
CW FWHM
Side mode suppression ratio (SMSR)
At locked wavelength
Average relative intensity noise (RIN)
200MHz to 8GHz
Parameter
Conditions
Min
Thermistor resistance
For locked wavelength [16]
4500
TEC current
5
40
50
dB
-140
dB/Hz
Max
Unit
10100
Ohms
EOL, T Case = 75°C
1.1
A
TEC voltage
EOL, T Case = 75°C
3
V
Module power dissipation
EOL, T Case = 75°C
1.5
4
W
Parameter
Conditions
Min
Typ
Max
Unit
Etalon photocurrent at
locked wavelength
EOL
0.1
2
mA
Reference photocurrent at
locked wavelength
EOL
0.1
2
mA
Etalon slope at locking point
EOL [1]
0.3
7
uA/pm
Reference slope at locked wavelength
EOL
0.1
3
uA/pm
Etalon / reference current ratio at
locking point
[11]
0.2
2
ratio
Wavelength accuracy over life
and temperature
[12]
-20
20
pm
Laser drive current tuning coefficient
[13]
3
7
pm/mA
Typ
TEC and Thermal Parameters
Wavelength Locker Parameters
3
4
Data Sheet
Characteristics (continued)
Parameter
Conditions
Min
Typ
Must be regulated [14]
-5.1
-5
Max
Unit
Tap and VOA Parameters
Tap bias voltage
Tap photocurrent
VOA power dissipation
[15]
VOA bias voltage
[15]
VOA photocurrent
[15]
-8
V
10
mA
350
mW
0
V
50
mA
S11 Test Mask
Note: AC parameters such as extinction ratio and waveform crossing
may be system dependent.
4
Data Sheet
Glossary
BFM
Back Facet Monitor diode
MZ
Mach-Zehnder interferometer
CW
Continuous wave
SOL
Start of life
EOL
End of life
Tcase
Case temperature
FWHM
Full width half maximum
Pk-pk
Peak to peak
Notes to Characteristic Tables
[1] Refer to Bookham applications document AN0117 for
Tx case temperature measurement definition.
[11] Maintain the start of life locking ratio over life to hold
wavelength constant.
[2] Deliverable data is provided to set a start of life (SOL)
mean modulated optical power of 4.0dBm, Tcase at
room temperature, using the internal variable optical
attenuator and power tap. Refer to Bookham
applications document AN0132.
[12] Assumes wavelength is set to ITU wavelength at start of
life, closed loop wavelength control by maintaining
constant locking ratio.
[3] The End Of Life (EOL) mean optical power specification
is defined as SOL+/-1dB.
[14] The power tap responsivity is bias voltage dependent.
[4] Measured reference to a high speed sampling
oscilloscope (unfiltered). EOL figure does not include
modulator driver component ageing if applicable.
[15] VOA dissipation, current and voltage limits apply
simultaneously. Do not exceed any one limit. Refer to
Bookham applications document AN0132 for parameter
and operating condition definitions.
[5] Measured with 1600ps/nm chromatic dispersion, ITU-T
G652 optical fibre, 10.709Gb/s, 223-1 PRBS NRZ
sequence. The penalty calculation is made at a BER level
of 10-10. RX OSNR > 30dB (35dB target), RBW of 0.1nm
using a Bookham standard receiver with differential drive
to modulator. The device is driven directly from a pattern
generator. Receiver decision point self optimised for
amplitude and phase.
[16] The thermistor current should not exceed 100 µA to
prevent self-heating effects. The thermistor resistance
varies with temperature according to the following
Steinhart-Hart equation, where C1= 1.2156x10-3, C2=
2.1925x10-4, C3=1.5241x10-7 for the thermistor type
used. Temperature is required in Kelvin.
[6] At the input to the LMC10NEJ. Driver selection must take
into account modulator driver to transmitter transmission
line losses. Refer to Bookham applications
document AN0137.
[17] Slope of the etalon can be positive or negative.
[7] Optical return loss of plant attached to LMC10NEJ
fibre connector.
Note: AC parameters such as extinction ratio and waveform
crossing may be system dependent.
[8] Optical return loss looking back into the LMC10NEJ
averaged over polarisation states, with target value
of +27dB.
[9] This is the requirement for the crossing control loop over
life and temperature relative to SOL measurement at
Tcase = room temperature. Reference application notes
AN0143, AN0132.
[10] Assuming 50% crossing level set at start of life.
5
[13] Wavelength variation with change in laser drive current at
constant temperature.
Data Sheet
Absolute Maximum Ratings
Condition
Min
Storage case temperature
-40
Typ
Laser Current
Laser Voltage
MZ modulator voltage (DC)
Unit
85
C
600
mA
-2
-12
[1]
MZ modulator arm bias currents (DC) [2]
Optical attenuator bias voltage (DC)
Optical attenuator power dissipation
V
0
V
12
mA
-8
Optical attenuator bias current (DC)
[5]
V
50
mA
350mW @-7V
320mW @-8V
mW
BFM bias
-15
0
V
Power Tap voltage
-6
0
V
10
mA
Power Tap current
TEC voltage
[6]
-3
3
V
TEC current
[6]
-1.8
1.8
A
Output optical power [continuous operation]
13
dBm
Lead soldering temperature
260
°C
Fiber bend radius [4]
[3]
30
Notes:
[1]
[2]
[3]
[4]
[5]
With laser off. Do not forward bias the MZ arms or the Power Tap.
Do not exceed the MZ and Power Tap maximum currents.
Maximum soldering time of 10 seconds, Tx case and fibre must not be subjected to extremes of temperature.
Minimum fiber bend radius of 30mm, fiber may be damaged if exceeded.
Optical attenuator voltage and current must be limited to ensure that the maximum power dissipation is not
exceeded. Refer to Bookham applications note AN0132.
[6] Thermistor operational range must not be exceeded.
ESD Rating
This product is ESD compliant to Class 2 as defined by Telcordia TA-TSY-000870.
ESD precautions must be used when handling this device and are required in both
production and R&D environments.
6
Max
mm
Data Sheet
Schematic Diagram
Pin Out Table
7
Pin #
Function
Pin #
Function
1
Data bias
9
Case ground
2
Data bar bias
10
TEC -
3
VOA
11
TEC +
4
Power tap
12
Laser anode
5
Case ground
13
Thermistor
6
Data bar
14
Etalon BFM anode
7
Case ground
15
BFM common cathode
8
Data
16
Reference BFM anode
Data Sheet
Pin Definitions
Pin1 MZ data DC Bias input and Pin 2 MZ data-bar
DC Bias input.
DC bias voltages for data and data-bar MZ arms. These pins
must be connected to a low noise negative DC voltage,
typically around -2V (WRT case). These voltages are defined
for each Tx in the deliverable data. A precision voltage source
must be used, which is capable of sourcing up to 10mA to
each pin. Refer to Bookham applications note AN0130 for
circuit implementation and filtering suggestions.
Pin 3 VOA control pin.
VOA control pin. A negative DC voltage (WRT case) between
0V to -8V is applied to pin 3 to control the Variable Optical
Attenuator (VOA). The VOA is used in a control loop with a
power monitor to provide continuous optical power out of the
optical fiber. Refer to Bookham applications document
AN0132 for information.
Pin 4 Power tap pin.
The power tap pin must be biased at -5V (WRT case).
The supply should be regulated if the device is to be used
in mode1 or mode 2 as the monitor diode responsivity is
voltage dependent. Refer to Bookham applications note
AN0132 and AN0143 for information.
Pin 5, 7 and 9 Ground.
Package ground connections.
Pin 6 MZ Data-bar modulation input and Pin 8 MZ Data
modulation input.
Operation is typically using differential electrical drive voltages
applied to both the Data and Data-bar MZ modulator inputs.
AC RF coupling must be used.
Pin 10 TEC(-) and Pin 11 TEC(+).
The LMC10 contains a Peltier heatpump. Applying a negative
voltage on Pin 10 with respect to Pin 11 will cause the
internal optics to be cooled relative to the case temperature.
Reversing the applied voltage will cause the internal structure
to be heated. The heatpump must be used in a feedback
controlled circuit in conjunction with the internal thermistor.
8
Pin 12 Laser Anode.
The laser is operated with a forward bias current, the laser
cathode being connected internally to case ground.
Pin 13 Thermistor.
The thermistor is used in the TEC control loop for keeping the
internal temperature at a constant value. It has a nominal
resistance of 10k Ohms at the typical operating temperature
of 25ºC and is not polarity sensitive, although one side of the
thermistor is connected to package ground. Operating
current should be limited to less than 100µA to prevent self
heating errors. The exact thermistor value is supplied with
each Tx as part of the deliverable test data to ensure the
correct operating wavelength.
Pin 14 Back Facet Monitor Diode Anode (Etalon).
The signal from this photodiode carries the spectral response
of the wavelength filter.
Pin 15 Back Facet Monitor Diode Common Cathode.
Common connection for the monitor diode cathodes.
Pin 16 Back Facet Monitor Diode Anode (Reference).
The signal from this photodiode is the reference signal and
indicates the power emitted from the rear facet of the laser.
The signal from the reference and etalon monitors are used in
a control loop to maintain the wavelength of the laser at the
defined lock point.
Data Sheet
Operating the LMC10NEJ
Control Schemes for the LMC10NEJ
Arm DC Bias Voltage Control
A dynamic control scheme can be implemented to maintain the bias points on the left and right arms of the MZ modulator at the
quadrature point. This will maintain the output pulse train with a 50% eye crossing level. The control circuit needs to track any over
life change in the bias points, thereby maintaining the 50% eye crossing condition.
Dynamic Output Power Control
The power tap (tap) and variable optical attenuator (VOA) can be utilised as part of an optical power control loop. The circuit
should act to maintain a constant power tap photocurrent by changing the VOA voltage. The tap current is set to a reference value
determined during manufacturing test of the transmitter. Maintaining this value over life will ensure the power range given in this
specification can be met. It will also improve the short term power stability of the product over and above that which can be
achieved with the tap and VOA not used.
It is not intended that the VOA should be used for open loop optical attenuation other than that specified above.
Benefits of Using Control Schemes
The product can be used without the control schemes discussed above. But there are benefits of implementing the control loops:Maintaining the optical eye crossing to 50% through the life of the product will minimise the variation in extinction ratio and reduce
variations in link dispersion penalty.
If the tap and VOA control scheme is used then the short and long term power stability is enhanced. This is because any changes
in optical performance caused by optical coupling variations over the operational case temperature range, can be compensated for
by the power tap and VOA and overall power stability is improved. This is at the expense of lower start of life power to allow some
VOA margin with which to implement the compensation.
Summary
For more demanding applications at higher link lengths or tighter link budgets the LMC10NEJ may be used with control schemes
which will provide MZ arm bias point control for 50% optical eye crossing.
Use of the tap and VOA in a control loop can offer improved power stability compared to open loop performance.
9
Data Sheet
Wavelength Locker for the LMC10NEJ
Lockpoint
The wavelength locker for the LMC10NEJ includes two photodiodes: the Reference photodiode provides a photocurrent
proportional to the laser chip facet power, and the Etalon photodiode provides a photocurrent related to wavelength (frequency).
In order to lock the LMC10NEJ wavelength, a control circuit should be used which maintains the laser submount temperature
constant over life and then controls the wavelength by varying the laser forward current to keep the ratio of the etalon and
reference photodiode currents (Locking Ratio) constant. This may be achieved by keeping the discrimination value (LR x Iref) – Iet)
at zero, where LR is the target Locking Ratio.
Lockpoint
Refer to applications document AN0142 for further information on wavelength locking.
10
Data Sheet
Package Outline Drawing
11
Data Sheet
Typical 10Gb/s Eye Diagram
Test Conditions: 10.709Gb/s 223-1PRBS NRZ data.
Typical Over Fibre Performance (SMF-28)
Test Conditions: 10.709Gb/s 223-1PRBS NRZ data, BER10-12.
Penalty (dB)
Performance over fibre
Dispersion (ps/nm)
12
Data Sheet
LMC10 Mounting Guidelines
The device must be attached to a heat-sink capable of
dissipating a minimum of 4W. The surface of the heat-sink
must be smooth (< 0.8 micron Ra) and flat (< 24.8 microns
over the area and not convex in form). Attachment screws,
thermal interface compounds or interface pads may be used
but must not exert stress upon the device. Refer to Bookham
applications document AN0117.
Note on Maximum Ratings and Handling Precautions
It is the nature of this device that unprotected semi-conductor
junctions are connected directly to external package pins.
Protection of these junctions would have an adverse effect on
the performance of the device or the flexibility in its
application and use. The user is requested to observe the
‘Absolute Minimum and Maximum Ratings’ in order to
prevent damage or destruction of the device. In particular
forward biasing the modulator, attenuator or power monitor
junctions will lead to catastrophic damage if the current or
voltage limits are exceeded. These junctions are also sensitive
to ESD and electrical transients. The laser is similarly sensitive
to reverse bias, ESD and electrical transients. These can lead
to catastrophic device damage. The user is requested to
ensure that operation of any control or bias circuits do not
introduce electrical transients or adverse bias conditions
during switch-on, switch-off or calibration and set-up
routines. Appropriate ESD precautions are required in both
production and R&D environments.
Applications Support
The following application notes are available to support customers using the LMC10NEJ:
Component Mounting Recommendations For the Bookham
LMC10 InP MZ Transmitter Module
AN0117
LMC10NEJ Optical Power Stabilisation Using the Integral
VOA and Power Tap
AN0132
LMC10NEJ Dynamic MZ Modulator DC Bias Control Recommendations
for high Performance Power & Eye Mask Stability
AN0143
LMC10 Implementing Dynamic Wavelength Locker Loops
For DWDM Optical Systems
AN0142
Characterisation of the LMC10 InP MZ in a 2.5Gb/s
Optical Systems Environment
AN0138
Compact LMC10 InP MZ Evaluation Board User Document
AN0130
Recommended RF drivers for the LMC10 Integrated Optical
Transmitter Product Portfolio
AN0137
Optical component evaluation platforms are available for all Bookham Technology optical products.
Contact your regional sales representative for further information.
13
Data Sheet
Deliverable Data
The following deliverable data is provided as a paper copy with each device
and can also be made available as a text file from a customer specific site on
a Bookham server with password protection.
Parameter
Units
Thermistor operating resistance
Ohms
Laser bias current
mA
Wavelength operating
nm
MZ bias data
Volts
MZ bias data-bar
Volts
Locking reference current
mA
Locking etalon current
mA
Locking current ratio
-
Locker slope sign
+ or -
[2]
Laser threshold
mA
MZ drive voltage amplitude
Volts
Wavelength target (ITU-T)
nm
Thermistor temperature
°C
Laser current tuning coefficient
pm/mA
BFM reference locker slope
µA/pm
BFM etalon locker slope
µA/pm
AC extinction ratio
dB
Target eye crossing
%
VOA voltage for SOL power
V
[1]
Power tap current for SOL power
[1]
Notes:
[1] Deliverable data is provided to set a start of life (SOL) mean modulated optical power using the internal
variable optical attenuator and power tap to a value of 4.0dBm. Refer to Bookham applications
document AN0132.
[2] Positive sign indicates etalon photocurrent increasing with wavelength at lock point. Refer to Bookham
applications document AN0142 for locker slope definitions.
AC specified parameters may be derived from DC measurement data.
14
mA
Data Sheet
RoHS Compliance
Bookham is fully committed to environment
protection and sustainable development and has
set in place a comprehensive program for
removing polluting and hazardous substances from
all of its products. The relevant evidence of RoHS
compliance is held as part of our controlled
documentation for each of our compliant products.
RoHS compliance parts are available to order,
please refer to the ordering information section for
further details.
Ordering Information:
LMC10NEJ
(Wavelength)
****
– (Connector)
J28 = SC/PC
J57 = LC
J59 = MU
**** = last four digits of wavelength value
e.g. for λp=1533.47nm, ****=3347
WDM wavelength range:
C-Band 1528-1565 nm
L-Band 1570-1606 nm
Standard fibre length 1000 +/- 100 mm (blue jacket)
Other connector types are available on request
To order the LMC10 on an evaluation board, please use the prefix
EV in front on the product code e.g. EVLMC10NEJ****-J28
Bookham reserve the right to change without notice.
Contact Information
North America
Bookham Worldwide
Headquarters
Europe
Paignton Office
Asia
Shenzhen Office
2584 Junction Ave.
San Jose
CA 95134
USA
Brixham Road
Paignton
Devon
TQ4 7BE
United Kingdom
2 Phoenix Road
Futian Free Trade Zone
Shenzhen 518038
China
• Tel: +1 408 919 1500
• Tel: +44 (0) 1803 66 2000
• Fax: +1 408 919 6083
• Fax: +44 (0) 1803 66 2801
• Fax: +86 755 33305805
+86 755 33305807
• Tel: +86 755 33305888
Important Notice
Performance figures, data and any illustrative material
provided in this data sheet are typical and must be
specifically confirmed in writing by Bookham before
they become applicable to any particular order or
contract. In accordance with the Bookham policy of
continuous improvement specifications may change
without notice. The publication of information in this
data sheet does not imply freedom from patent or other
protective rights of Bookham or others. Further details
are available from any Bookham sales representative.
www.bookham.com
[email protected]
INVISIBLE LASER RADIATION
DO NOT VIEW DIRECTLY
WITH OPTICAL INSTRUMENTS
CLASS 1M LASER PRODUCT
15
REFERENCE IEC 60825-1 Edition 1.2
MAX POWER < 500mW
WAVELENGTH 1480 - 1620nm
CLASS IIIb LASER PRODUCT
This product complies with
21CFR 1040.10
ISO14001:1996
EMS 504193
TL9000 Rev 3.0 (ISO9001:2000)
FM15040
Caution - use of controls or adjustments or
performance of procedures other than
those specified herein may result in
hazardous radiation exposure.
BH12845 Rev 1.0 January 2007.
©Bookham 2005. Bookham is a registered trademark of Bookham Inc.
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