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Summary of Contents for iXBlue MBC-AN-LAB
- Page 1 MBC-AN-LAB Operating Manual Version 2.0...
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Page 2: Table Of Contents
Purpose ..........................3 Audience ........................... 3 Prerequisites ........................4 Terms and Symbols in this Manual ..................4 Electrical safety ......................... 4 Contacting iXblue ......................4 General Information ..............5 Product Overview ......................5 Principle of operation ......................5 Standard Specifications ..................... 7 Panel features ................ - Page 3 MBC-AN-LAB Version 2.0...
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Page 4: Legal Notice
Audience This manual is aimed at professionals with the necessary technical background and prerequisites needed to use fiber optics equipment, including lithium niobate modulators, and the related tests equipment and accessories. MBC-AN-LAB Version 2.0... -
Page 5: Prerequisites
WARNING expose this instrument to water or excessive moisture. Do not operate the board in the presence of flammable gases or fumes. Contacting iXblue For application oriented or service related requests, please contact iXblue customer service department: contact@ixblue.com MBC-AN-LAB Version 2.0... -
Page 6: General Information
Quad+ or Quad- position. The MBC-AN-BT is operated with a user supplied PC. It comes with a Windows graphical user interface. Figure 1: basic scheme of a modulation set-up including a modulator bias controller and 2 external monitoring photodiodes MBC-AN-LAB Version 2.0... - Page 7 DC electrodes of the modulators in order to maintain the operating point at the desired position. The principle of operation of the MBC-AN is based on a proportional integrator feedback loop. It has been design only for locking the operating point at Quad+ or Quad-. MBC-AN-LAB Version 2.0...
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Page 8: Standard Specifications
Bias Output BNC Female connector Communication USB Connector Environmental Operating temperature °C Dimensions 220 x 220 x 52mm Software (GUI) Windows XP SP3 Minimum computer requirements One USB port Windows XP SP3 Recommended computer configuration One USB port MBC-AN-LAB Version 2.0... -
Page 9: Panel Features
Output of the first integrated coupler, to the input optical fiber modulator <6>: Modulator optical output Input, fiber from modulator output (coupler option) Input, part of modulator output power (no coupler option) <7>: Signal (optional) Output of the second integrated coupler, working signal. MBC-AN-LAB Version 2.0... -
Page 10: Back Panel
USB Cord AC-DC Power Supply Installation and set up To set-up the MBC-AN-Board for your application you have to install the MBC-AN control software. Preliminary: MBC Interface software installation Minimum computer requirements: Windows XP/Vista/7 USB port MBC-AN-LAB Version 2.0... -
Page 11: Operation
PD1 output connector. And plug the laser connector to the PD1 input connector. Connect the Vbias connector to the modulator Vbias pin, and the ground connector to the modulator ground. Setup with an internal coupler (coupler option): MBC-AN-LAB Version 2.0... - Page 12 7. Select the device 8. Select manual mode and adjust Vbias Mod (can go positive or negative) to get the maximum optical power at the input of your power meter Figure 2: Manual mode selection 9. When done check Automatic MBC-AN-LAB Version 2.0...
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Page 13: Remarks
10. Check the Reset button to restart the integrator 11. The board should be in quad mode Remarks: 1. If needed the MBC-AN-BOARD can be used as a manual modulator bias source by selecting the manual mode. Figure 6: Manual mode selection MBC-AN-LAB Version 2.0... -
Page 14: Calibrating The Board
Calibrating the board The Calibration mode is used, when you need to set-up the board, for example when you change the modulator. 1. Select the Calibration Menu in the toolbar. Then enter the following password: trepxe MBC-AN-LAB Version 2.0... - Page 15 Figure 8: Calibration mode selection 2. Select manual mode and adjust Vbias Mod (can go positive or negative) to get the maximum optical power at the input of your power meter. Figure 9: Manual mode selection MBC-AN-LAB Version 2.0...
- Page 16 Change the coarse gain in the PDL (PhotoDiode Laser) settings box to get a value around 1.75V in the PDM voltage box, and adjust with fine gain. (PDL voltage = PDM voltage / 2) Figure 4: PDL adjustment MBC-AN-LAB Version 2.0...
- Page 17 6. The board should be in quad mode. If the optical power measured at the output is different from Pmax - 3dB, and that the LED +/-Vbias sat. are not ON, you can adjust the power by changing the value of the fine gain and coarse gain of PD1. MBC-AN-LAB Version 2.0...
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Page 18: Appendices
MZM operating point using a fixed voltage. Figure 7 illustrates the typical electrode architecture of LiNbO MZMs. Figure 6 : Transfer function of a Mach-Zehnder modulator and data output vs. data input at QUAD+ and QUAD- operating point MBC-AN-LAB Version 2.0... -
Page 19: Drift Effects
In the circuit model of Figure 8, all layers, including the LiNbO3 substrate, the Ti:LiNbO3 optical waveguide and the buffer layer, are represented in terms of resistances R and capacitances C, in both vertical and horizontal directions of the crystal. MBC-AN-LAB Version 2.0... - Page 20 This results into a shift in the switching curve, in the same way that operates the DC drift. Hence, to mitigate thermal effects, there is a need to distribute or dissipate the charges that are accumulating on the LiNbO3 crystal surfaces and between the electrodes. MBC-AN-LAB Version 2.0...
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