LMC10NEJ3347-J59 - Bookham Technology, Inc.

Data Sheet

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

•Shortterm 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

•IndustryStandard14-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 MetroNetworks

•LR2 compliant Transponders

•2.5Gb/s Long Haul DWDM Multi span non

dispersion compensated links

10Gb/s Compact InP MZ Modulator

with DWDM Laser

LMC10NEJ

Data Sheet

Characteristics

Parameter Conditions Min Typ Max Unit

Module and Modulator Parameters

Case temperature[Tcase] External temperature of Tx case [1] -5 75 °C

Modulated output power EOL over temperature [2] [3] 345dBm

Modulated output power - -0.5 0.5 dB

short term tracking

AC extinction ratio EOL, 10.709Gb/s [4] 10 11.5 dB

Dispersion penalty over temperature 10.709Gb/s, 1600ps/nm, EOL [5] 2dB

Data bar arm bias <9mA arm bias current -4 -1.1 V

Data arm bias <9mA arm bias current -2.2 -0.5 V

Modulation drive voltage per arm, pk-pk, 10.709Gb/s [6] 1.8 2.7 V

Optical rise time, fall time 20% - 80% 35 ps

Tolerable link optical reflection [7] -14 dB

Output optical return loss [8] 20 dB

Optical crossing level [Mode 1] [9] 48 50 52 %

Optical crossing level [Mode 2] [10] 40 60 %

Modulator bandwidth S21, -3dB 10 GHz

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.

Data Sheet

Characteristics (continued)

Parameter Conditions Min Typ Max Unit

Laser Source Parameters

Laser forward current EOL C & L-Band. Wavelength locked 360 mA

Change in laser forward current From SOL to EOL -35 35 mA

Laser threshold current EOL 20 85 mA

Laser forward voltage EOL at locked wavelength 2.3 V

Laser linewidth CW FWHM 5 20 MHz

Side mode suppression ratio (SMSR) At locked wavelength 40 50 dB

Average relative intensity noise (RIN) 200MHz to 8GHz -140 dB/Hz

Parameter Conditions Min Typ Max Unit

TEC and Thermal Parameters

Thermistor resistance For locked wavelength [16] 4500 10100 Ohms

TEC current 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

Wavelength Locker Parameters

Etalon photocurrent at EOL 0.1 2 mA

locked wavelength

Reference photocurrent at EOL 0.1 2 mA

locked wavelength

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 [11] 0.2 2 ratio

locking point

Wavelength accuracy over life [12] -20 20 pm

and temperature

Laser drive current tuning coefficient [13] 3 4 7 pm/mA

Data Sheet

Parameter Conditions Min Typ Max Unit

Tap and VOA Parameters

Tap bias voltage Must be regulated [14] -5.1 -5 V

Tap photocurrent 10 mA

VOA power dissipation [15] 350 mW

VOA bias voltage [15] -8 0 V

VOA photocurrent [15] 50 mA

Characteristics (continued)

Note: AC parameters such as extinction ratio and waveform crossing

may be system dependent.

S11 Test Mask

Data Sheet

Glossary

BFM Back Facet Monitor diode

CW Continuous wave

EOL End of life

FWHM Full width half maximum

MZ Mach-Zehnder interferometer

SOL Start of life

Tcase Case temperature

Pk-pk 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 startof 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 figuredoes 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 startof

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 µA to

prevent self-heating effects. The thermistor resistance

varies with temperatureaccording to the following

Steinhart-Hart equation, where C1= 1.2156x10-3, C2=

2.1925x10-4, C3=1.5241x10-7 for the thermistor type

used. Temperatureis 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.

Data Sheet

Absolute Maximum Ratings

Condition Min Typ Max Unit

Storage case temperature -40 85 C

Laser Current 600 mA

Laser Voltage -2 V

MZ modulator voltage (DC) [1] -12 0 V

MZ modulator arm bias currents (DC) [2] 12 mA

Optical attenuator bias voltage (DC) -8 V

Optical attenuator bias current (DC) 50 mA

Optical attenuator power dissipation [5] 350mW @-7V mW

320mW @-8V

BFM bias -15 0 V

Power Tap voltage -6 0 V

Power Tap current 10 mA

TEC voltage [6] -3 3 V

TEC current [6] -1.8 1.8 A

Output optical power [continuous operation] 13 dBm

Lead soldering temperature [3] 260 °C

Fiber bend radius [4] 30 mm

Notes:

[1] With laser off. Do not forward bias the MZ arms or the Power Tap.

[2] Do not exceed the MZ and Power Tap maximum currents.

[3] Maximum soldering time of 10 seconds, Tx case and fibre must not be subjected to extremes of temperature.

[4] Minimum fiber bend radius of 30mm, fiber may be damaged if exceeded.

[5] 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.

Data Sheet

Schematic Diagram

Pin Out Table

Pin # Function Pin # Function

1 Data bias 9 Case ground

2 Data bar bias 10 TEC -

3VOA 11 TEC +

4 Power tap 12 Laser anode

5Case ground 13 Thermistor

6Data 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.

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

acontrol 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

Adynamic 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 temperaturerange, 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.

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, whereLR is the target Locking Ratio.

Refer to applications document AN0142 for further information on wavelength locking.

Lockpoint Lockpoint

Data Sheet

Package Outline Drawing

Data Sheet

Typical 10Gb/s Eye Diagram

Test Conditions: 10.709Gb/s 223-1PRBS NRZ data.

Typical Over Fibre Performance (SMF-28)

Performance over fibre

Dispersion (ps/nm)

Penalty (dB)

Test Conditions: 10.709Gb/s 223-1PRBS NRZ data, BER10-12.

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

Applications Support

The following application notes areavailable to supportcustomers using the LMC10NEJ:

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.

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 BoardUser 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.

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

aBookham server with password protection.

Notes:

[1] Deliverable data is provided to set a startof 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.

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 [2] +or -

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 [1] V

Power tap current for SOL power [1] mA

Data Sheet

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.

Contact Information

BH12845 Rev 1.0 January 2007.

North America

Bookham Worldwide

Headquarters

2584 Junction Ave.

San Jose

CA 95134

USA

•Tel: +1 408 919 1500

•Fax: +1 408 919 6083

www.bookham.com

sales@bookham.com

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

2Phoenix Road

Futian Free Trade Zone

Shenzhen 518038

China

• Tel: +86 755 33305888

•Fax: +86 755 33305805

+86 755 33305807

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 areavailable on request

Toorder 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.

MAX POWER < 500mW

WAVE LENGTH 1480 - 1620nm

CLASS IIIb LASER PRODUCT

This product complies with

21CFR 1040.10

REFERENCE IEC 60825-1 Edition 1.2

INVISIBLE LASER RADIATION

DO NOT VIEW DIRECTLY

WITH OPTICAL INSTRUMENTS

CLASS 1M LASER PRODUCT

Caution - use of controls or adjustments or

performance of procedures other than

those specified herein may result in

hazardous radiation exposure.

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.

ISO14001:1996

EMS 504193

TL9000 Rev 3.0 (ISO9001:2000)

FM15040