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Automatic Bias Controller Board, Five Mode Operation
Caution: The user must read this manual before operating the BCB-4 unit.
Operations other than those described in this manual may result in personal
injury and/or damage to the unit.
Note that any attempt to open or fix the equipment without prior approval by
Optilab, LLC voids the warranty.
BCB-4 User's Manual
Ver. 1.5
August 18, 2022
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Table of Contents
Related Manuals for OPTILAB BCB-4
Summary of Contents for OPTILAB BCB-4
- Page 1 BCB-4 User’s Manual Automatic Bias Controller Board, Five Mode Operation Caution: The user must read this manual before operating the BCB-4 unit. Operations other than those described in this manual may result in personal injury and/or damage to the unit.
- Page 2 Copyright © 2022 by Optilab, LLC All rights reserved. This document is copyrighted property of Optilab, LLC. It may not be used in whole or in part for manufacture, sale, or design of items without the written permission of Optilab, LLC.
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Page 3: Table Of Contents
BCB-4 User’s Manual Page iii of iii Table of Contents 1. GENERAL INFORMATION 1.1 I NTRODUCTION 1.2 P RODUCT VERVIEW 1.3 F EATURES 1.4 U AFETY 2. OPERATION 2.1 I NTRODUCTION 2.2 I NITIAL NSPECTION 2.3 C ONTROLS 2.4 A... -
Page 4: General Information
OEM integration, the BCB-4 allows for a stable Q+, Q-, Min, and Max operation over long periods of time. The BCB-4 also features a manual bias mode with a stable setting range of -11 to +11V DC. With a... -
Page 5: Operation
Page 2 of 14 2. Operation 2.1 Introduction This chapter describes how to operate the BCB-4 unit and discusses the location and function of the controls and connectors. 2.2 Initial Inspection Your BCB-4 unit was carefully inspected before it left the manufacturer. It should be in proper working order upon receipt. -
Page 6: Controls
Power/COM Interface Module EATURE UNCTION RS-485 C Connection of this port to the BCB-4 provides power to the unit and ONNECTION remote control of the device via RS-485 protocol. Connect this port either the Optilab PS-5 power supply (with the provided Molex cable), or to the appropriate +5VDC, -5VDC, GND terminals. -
Page 7: Application Block Diagram
The BCB-4 bias controller utilizes an on-board photodetector power monitor. In this monitor / feedback fashion, the automatic bias control circuit (BCB-4) is used to ensure the modulator bias point is maintained at the desired level. Optilab, LLC 600 E. -
Page 8: Operation Instructions
PD of the BCB-4. Without this connection the BCB-4 will not function properly. The split ratio of the tap coupler should be selected based on the optical input power to the intensity modulator and the modulators insertion loss and should be between -20 and -10 dBm when the modulator is biased to maximum point. - Page 9 ~1% or lower is required to achieve high extinction ratio. Remote Control Procedure 1. In order to offer full remote control, and to set the internal BCB-4 bias setting mode, you will need to set up an appropriate PC, with an appropriate serial port communication protocol software installed.
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Page 10: Rs485 Command Set
BCB-4 User’s Manual Page 7 of 14 3. Once the BCB-4 is recognized by the PC interface, you are now ready to send the remote commands to the BCB-4. The device uses the following serial port communication protocols, ensure that your serial port... -
Page 11: Troubleshooting
AUSE AND OLUTION C: Improper bias pin connection setting. S: Check to ensure that the cable between the BCB-4 and the intended optical modulator is made correctly. C: Optical input to the modulator is too high/low. S: Due to the photodiode feedback design, the ability to bias the modulator depends on the amount of photodiode current feedback to the BCB-4. -
Page 12: Technical Specifications
BCB-4 User’s Manual Page 9 of 14 4. Technical Specifications Optical Input Requirements 980nm – 1700nm Operating Wavelength Optical Input Level (onboard PD) -20 dBm minimum, -10 dBm max. RF / DC Bias Specifications Dither Signal Frequency 1 kHz Dither Adjustment Range... -
Page 13: Service And Support
6. Service and Support 6.1 Warranty Optilab, LLC guarantees its BCB-4 unit to be free of defects for 1 year from the date of shipment. The guarantee does not cover any damages resulting from the misuse or improper handling of the equipment, or any incidental or consequential loss. -
Page 14: Care Of Fiber-Optic Connectors
BCB-4 User’s Manual Page 11 of 14 6.3 Care of Fiber-optic Connectors Damage to optical connectors account for more than 70 percent of equipment performance degradation. To avoid such damage, the user should use only industrial grade 99% pure isopropyl alcohol and follow the procedures below to keep the connectors, adaptors, and receptacles clean. -
Page 15: Appendix A - 4-Pin Molex Connector
BCB-4 User’s Manual Page 12 of 14 Appendix A – 4-pin Molex Connector NOT USED FOR BCB-4 Optilab, LLC 600 E. Camelback Road, Phoenix, AZ 85012 Phone: (602) 343-1496, Fax: (602) 343-1489, Email: sales@oequest.com... -
Page 16: Appendix B - Rs485 Command Set
BCB-4 User’s Manual Page 13 of 14 Appendix B – RS485 Command Set [ADD] Refers to address programmed to the device using the SETADD:X command and should be replaced with this address when sending commands to the device. {CR/LF} Refers to the type of termination used to signal the end of a command being sent to the device. This should be handled by your communication software and not manually typed into the command. - Page 17 BCB-4 User’s Manual Page 14 of 14 SET COMMANDS RESET[ADD]{CR/LF} – Resets the device. SETADD:X{CR/LF} – Set the device address for RS-485 communication. Range: 0 – 9. Default: 1. Example: SETADD:1{CR/LF} – Sets the device address to 1. SET[ADD]M:X{CR/LF} – Set the device bias mode (see table below); 1 digit required.