LMC10NEJ Datasheet, PDF (8/15 Pages) Bookham, Inc. – 10Gb/s Compact InP MZ Modulator with DWDM Laser

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
a control loop to maintain the wavelength of the laser at the
defined lock point.
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