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LMC10NEG3347-J28 Datasheet(PDF) 8 Page - Bookham, Inc. |
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LMC10NEG3347-J28 Datasheet(HTML) 8 Page - Bookham, Inc. |
8 / 14 page Data Sheet 8 Pin Definitions Pin 1 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 Connect to ground. Pin 4 Bias Control Tap The MZ bias control tap pin must be biased to -5V. The supply should be regulated if the device is used in mode 1 as the monitor diode responsivity is voltage dependent. Pins 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. Typical amplitude is 2.0V peak-to-peak. 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 structures 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 a 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 diode carries the spectral response of the wavelength filter. Pin 15 Back Facet Monitor Diode Common Cathode Common connection for monitor diode cathodes. Pin 16 Back Facet Monitor Diode Anode (Reference) The signal from this diode is the reference signal and indicates the power of the rear facet of the laser. The signals from the reference and etalon monitor diodes are used in a control loop to maintain the wavelength of the laser at the defined lock point. Operating the LMC10NEG Control Schemes for the LMC10NEG 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. Benefits of Using Control Schemes The product can be used without the control scheme as discussed above. But there are benefits of implementing the control loop: 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. Summary For more demanding applications at higher link lengths or tighter link budgets the LMC10NEG may be used with a dynamic control scheme which will provide MZ arm bias point control for 50% optical eye crossing. Use of the BCT in a control loop can offer improved optical eye shape stability compared to open loop performance. |
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