Current Mode Circuits for Fast and Accurate Optical Level Monitoring with Wide Dynamic Range(Devices/Circuits for Communications)

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概要

• 論文の詳細を見る

• This paper presents a new approach based on current mode circuits for fast and accurate optical level monitoring with wide dynamic range of a gigabit burst-mode laser driver chip. Our proposed solution overcomes the drawbacks that voltage mode implementations show at higher bit rates or in other technologies. The main speed-limiting factor of the level monitoring circuitry is the parasitic capacitance of the back facet monitor photodiode. We propose the use of an active-input current mirror to reduce the impact of this parasitic capacitance. The mirror produces two copies of the photo current, one to be used for the "0" level measurement and another for the "1" level measurement. The mirrored currents are compared to two reference currents by two current comparators. Every reference current needs only one calibration at room temperature. A pattern detection block scans the incoming data for patterns of sufficiently long consecutive O's or 1's. At the end of such a pattern a valid measurement is present at the output of one of the current comparators. Based on these measurements the digital Automatic Power Control (APC) will adjust the bias (I_<BIAS>) and modulation current (I_<MOD>) setting of the laser driver. Tests show that the chip can stabilize and track the launched optical power with a tolerance of less than 1 dB. In these tests the pattern detection was programmed to sample the current comparators after 5 bytes (32 ns at 1.25 Gbps) of consecutive 1's and O's. Automatic power control on such short strings of data has not been demonstrated before. Although this laser transmitter was developed for FSAN GPON applications at a speed of 1.25 Gbps upstream, the design concept is generic and can be applied for developing a wide range of burst mode laser transmitters. This chip was developed in a 0.35/zm SiGe BiCMOS process.

• 社団法人電子情報通信学会の論文
• 2004-09-01

著者

• BAUWELINCK Johan

  Ghent University, INTEC

• QIU Xing-Zhi

  IMEC

• VANDEWEGE Jan

  Ghent University, INTEC

• QIU Xing-Zhi

  Ghent University

• OSSIEUR Peter

  Ghent University

• Verhulst Dieter

  Ghent University Intec

• Vos Benoit

  Imec

• Vandewege Jan

  Ghent University

• VERHULST Dieter

  IMEC

• Bauwelinck Johan

  Ghent University

• VOS Benoit

  Alcatel Research & Innovation

関連論文

• Fast Consecutive Zero and One bits Detection Circuits for a 1.25 Gbit/s Burst Mode Laser Driver(Communication Devices/Circuits)
• A Burst-Mode Laser Transmitter with Fast Digital Power Control for a 155 Mb/s Upstream PON(The IEICE Transactions on Communications, Vol.E86-B, No.5)
• A Burst-Mode Laser Transmitter with Fast Digital Power Control for a 155 Mb/s Upstream PON ( Recent Progress in Optoelectronics and Communications)
• Design of Automotive VCSEL Transmitter with On-Chip Feedforward Optical Power Control
• An Improved Current-Mode Squarer/Divider Circuit for Automotive Applications
• A Current-Steering DAC Architecture with Novel Switching Scheme for GPON Burst-Mode Laser Drivers(Electronic Circuits)
• Current Mode Circuits for Fast and Accurate Optical Level Monitoring with Wide Dynamic Range(Devices/Circuits for Communications)
• A Low-Power Reduced Kick-Back Comparator with Improved Calibration for High-Speed Flash ADCs
• A New Common-Mode Stabilization Method for a CMOS Cascode Class-E Power Amplifier with Driver Stage

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