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LMC10NEJ Datasheet(PDF) 9 Page - Bookham, Inc. |
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LMC10NEJ Datasheet(HTML) 9 Page - Bookham, Inc. |
9 / 15 page Data Sheet 9 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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