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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) * Suitable for 50GHz ITU applications with +/-20pm 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 * Co-planar differential RF drive 2.7 volts
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
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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 Module and Modulator Parameters Case temperature
[Tcase]
Conditions
Min
Typ
Max
Unit
External temperature of Tx case EOL over temperature [2] [3]
[1]
-5 3 -0.5 4
75 5 0.5 11.5 2
C dBm dB dB dB V V V ps dB dB
Modulated output power Modulated output power short term tracking AC extinction ratio Dispersion penalty over temperature Data bar arm bias Data arm bias Modulation drive voltage Optical rise time, fall time Tolerable link optical reflection Output optical return loss Optical crossing level [Mode 1] Optical crossing level [Mode 2] Modulator bandwidth
EOL, 10.709Gb/s
[4]
10
10.709Gb/s, 1600ps/nm, EOL [5] <9mA arm bias current <9mA arm bias current per arm, pk-pk, 10.709Gb/s 20% - 80%
[7] [8] [9] [10] [6]
-4 -2.2 1.8
-1.1 -0.5 2.7 35 -14
20 48 40 10 50 52 60
% % GHz
S21, -3dB
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Data Sheet
Characteristics (continued)
Parameter Laser Source Parameters Laser forward current EOL Change in laser forward current Laser threshold current EOL Laser forward voltage Laser linewidth Side mode suppression ratio (SMSR) Average relative intensity noise (RIN) EOL at locked wavelength CW FWHM At locked wavelength 200MHz to 8GHz 40 5 50 -140 C & L-Band. Wavelength locked From SOL to EOL -35 20 360 35 85 2.3 20 mA mA mA V MHz dB dB/Hz Conditions Min Typ Max Unit
Parameter TEC and Thermal Parameters Thermistor resistance TEC current TEC voltage Module power dissipation
Conditions
Min
Typ
Max
Unit
For locked wavelength [16] EOL, T Case = 75C EOL, T Case = 75C EOL, T Case = 75C
4500
10100 1.1 3 1.5 4
Ohms A V W
Parameter Wavelength Locker Parameters Etalon photocurrent at locked wavelength Reference photocurrent at locked wavelength Etalon slope at locking point Reference slope at locked wavelength Etalon / reference current ratio at locking point Wavelength accuracy over life and temperature Laser drive current tuning coefficient
Conditions
Min
Typ
Max
Unit
EOL EOL EOL [1] EOL
[11]
0.1 0.1 0.3 0.1 0.2 -20 3 4
2 2 7 3 2 20 7
mA mA uA/pm uA/pm ratio pm pm/mA
[12]
[13]
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Data Sheet
Characteristics (continued)
Parameter Tap and VOA Parameters Tap bias voltage Tap photocurrent VOA power dissipation VOA bias voltage VOA photocurrent
[15] [15] [15]
Conditions
Min
Typ
Max
Unit
Must be regulated [14]
-5.1
-5 10 350
V mA mW V mA
-8
0 50
S11 Test Mask
Note: AC parameters such as extinction ratio and waveform crossing
may be system dependent.
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Data Sheet
Glossary
BFM CW EOL FWHM Back Facet Monitor diode Continuous wave End of life Full width half maximum MZ SOL Tcase Pk-pk Mach-Zehnder interferometer Start of life Case temperature Peak to peak
Notes to Characteristic Tables
[1] Refer to Bookham applications document AN0117 for Tx case temperature measurement definition. [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. [3] The End Of Life (EOL) mean optical power specification is defined as SOL+/-1dB. [4] Measured reference to a high speed sampling oscilloscope (unfiltered). EOL figure does not include modulator driver component ageing if applicable. [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. [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. [7] Optical return loss of plant attached to LMC10NEJ fibre connector. [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. [11] Maintain the start of life locking ratio over life to hold wavelength constant. [12] Assumes wavelength is set to ITU wavelength at start of life, closed loop wavelength control by maintaining constant locking ratio. [13] Wavelength variation with change in laser drive current at constant temperature. [14] The power tap responsivity is bias voltage dependent. [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. [16] The thermistor current should not exceed 100 A 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.
[17] Slope of the etalon can be positive or negative. Note: AC parameters such as extinction ratio and waveform crossing may be system dependent.
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Data Sheet
Absolute Maximum Ratings
Condition Storage case temperature Laser Current Laser Voltage MZ modulator voltage (DC)
[1]
Min -40
Typ
Max 85 600
Unit C mA V
-2 -12 0 12 -8 50
[5]
V mA V mA mW V V mA V A dBm C mm
MZ modulator arm bias currents (DC) [2] Optical attenuator bias voltage (DC) Optical attenuator bias current (DC) Optical attenuator power dissipation BFM bias Power Tap voltage Power Tap current TEC voltage TEC current
[6] [6]
350mW @-7V 320mW @-8V -15 -6 0 0 10 -3 -1.8 3 1.8 13 260 30
Output optical power [continuous operation] Lead soldering temperature Fiber bend radius [4]
Notes:
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. [1] [2] [3] [4] [5]
[3]
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.
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Data Sheet
Schematic Diagram
Pin Out Table
Pin # 1 2 3 4 5 6 7 8 Function Data bias Data bar bias VOA Power tap Case ground Data bar Case ground Data Pin # 9 10 11 12 13 14 15 16 Function Case ground TEC TEC + Laser anode Thermistor Etalon BFM anode BFM common cathode Reference BFM anode
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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. 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 25C and is not polarity sensitive, although one side of the thermistor is connected to package ground. Operating current should be limited to less than 100A 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.
8
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.
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Data Sheet
Wavelength Locker for the LMC10NEJ
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. Refer to applications document AN0142 for further information on wavelength locking.
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Lockpoint
Lockpoint
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.
Performance over fibre
Penalty (dB)
Dispersion (ps/nm)
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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 LMC10NEJ Optical Power Stabilisation Using the Integral VOA and Power Tap LMC10NEJ Dynamic MZ Modulator DC Bias Control Recommendations for high Performance Power & Eye Mask Stability LMC10 Implementing Dynamic Wavelength Locker Loops For DWDM Optical Systems Characterisation of the LMC10 InP MZ in a 2.5Gb/s Optical Systems Environment Compact LMC10 InP MZ Evaluation Board User Document Recommended RF drivers for the LMC10 Integrated Optical Transmitter Product Portfolio AN0117 AN0132 AN0143 AN0142 AN0138 AN0130 AN0137
Optical component evaluation platforms are available for all Bookham Technology optical products. Contact your regional sales representative for further information.
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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 Thermistor operating resistance Laser bias current Wavelength operating MZ bias data MZ bias data-bar Locking reference current Locking etalon current Locking current ratio Locker slope sign Laser threshold MZ drive voltage amplitude Wavelength target (ITU-T) Thermistor temperature Laser current tuning coefficient BFM reference locker slope BFM etalon locker slope AC extinction ratio Target eye crossing VOA voltage for SOL power
[1] [1] [2]
Units Ohms mA nm Volts Volts mA mA + or mA Volts nm C pm/mA A/pm A/pm dB % V mA
Power tap current for SOL power
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.
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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 p=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
2584 Junction Ave. San Jose CA 95134 USA * Tel: +1 408 919 1500 * Fax: +1 408 919 6083
Europe Paignton Office
Brixham Road Paignton Devon TQ4 7BE United Kingdom * Tel: +44 (0) 1803 66 2000 * Fax: +44 (0) 1803 66 2801
Asia Shenzhen Office
2 Phoenix Road Futian Free Trade Zone Shenzhen 518038 China * Tel: +86 755 33305888 * Fax: +86 755 33305805 +86 755 33305807
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 sales@bookham.com
INVISIBLE LASER RADIATION DO NOT VIEW DIRECTLY WITH OPTICAL INSTRUMENTS CLASS 1M LASER PRODUCT
MAX POWER < 500mW WAVELENGTH 1480 - 1620nm CLASS IIIb LASER PRODUCT
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REFERENCE IEC 60825-1 Edition 1.2
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. (c)Bookham 2005. Bookham is a registered trademark of Bookham Inc.

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