LMC10ZEG Datasheet, PDF (5/14 Pages) Bookham, Inc. – 10Gb/s Compact InP MZ Modulator with DWDM Laser

Data Sheet
Glossary
BFM Back Facet Monitor diode
CW Continuous wave
EOL End of life
FWHM 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] Specified range over life. Integral VOA set to minimum
attenuation.
[3] Specified range over life. Integral VOA set to maximum
attenuation.
[4] Optical power variation over the operational case
temperature range of the Tx relative to 30C. Improved
power tracking can be achieved by implementing closed
loop power control using an external fiber power monitor
and the LMC10ZEG variable optical attenuator.
[5] Measurement of AC extinction ratio is to be referenced to
a Tektronix CSA8000B with 80C08C plug-in module.
Test conditions: 10.709Gb/s, 2²³-1 PRBS NRZ
sequence, 4th order Bessel-Thomson filter [where
specified]. EOL condition includes variations in ER over
the optical power range.
[6] Measured with +/-800ps/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.
The device is driven directly from a pattern generator.
Receiver decision point self optimised for amplitude and
phase.
[7] The differential modulation voltage is the peak to peak
voltage that is required to achieve the required optical
extinction ratio. The voltage and its complement must be
AC coupled to each of the Data and Data-bar pins.
[8] The module is expected to operate without damage into
a -14dB optical return loss equivalent to a fibre to
air interface.
[9] Optical return loss looking back into the LMC10ZEG
averaged over polarisation states.
[10] Set to nominal 50% at SOL, does not include effects of
electrical driver aging.
[11] Electro-optic bandwidth. (S21 e/o). This measurement is
made as a small signal measurement on each arm
separately, 3% smoothed.
[12] The thermistor current should not exceed 100 µA to
prevent self-heating effects. The thermistor resistance
varies with temperature according to the
following equation:
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.
[13] Measured at operating laser current Iop and an OSA
resolution of 0.1nm and a span of 10nm centred on the
peak wavelength.
[14] Maintain the start of life locking ratio over life to hold
wavelength constant.
[15] Assumes wavelength is set to ITU wavelength at start of
life, closed loop wavelength control by maintaining
constant locking ratio.
[16] Specified by design, not measured unit to unit.
[17] Wavelength variation with change in laser drive current at
constant temperature.
[18] VOA dissipation, current and voltage limits apply
simultaneously. Do not exceed any one limit.
Refer to applications document AN0141.
Note: AC parameters such as extinction ratio and waveform
crossing may be system dependent.
5