A compact picosecond pulsed laser source using a fully integrated CMOS driver circuit

Yuting He, Yuhua Li, Orly Yadid-Pecht

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Picosecond pulsed laser source have applications in areas such as optical communications, biomedical imaging and supercontinuum generation. Direct modulation of a laser diode with ultrashort current pulses offers a compact and efficient approach to generate picosecond laser pulses. A fully integrated complementary metaloxide- semiconductor (CMOS) driver circuit is designed and applied to operate a 4 GHz distributed feedback laser (DFB). The CMOS driver circuit combines sub-circuits including a voltage-controlled ring oscillator, a voltagecontrolled delay line, an exclusive-or (XOR) circuit and a current source circuit. Ultrashort current pulses are generated by the XOR circuit when the delayed square wave is XOR'ed with the original square wave from the on-chip oscillator. Circuit post-layout simulation shows that output current pulses injected into an equivalent circuit load of the laser have a pulse full width at half maximum (FWHM) of 200 ps, a peak current of 80 mA and a repetition rate of 5.8 MHz. This driver circuit is designed in a 0.13 μm CMOS process and taped out on a 0.3 mm2 chip area. This CMOS chip is packaged and interconnected with the laser diode on a printed circuit board (PCB). The optical output waveform from the laser source is captured by a 5 GHz bandwidth photodiode and an 8 GHz bandwidth oscilloscope. Measured results show that the proposed laser source can output light pulses with a pulse FWHM of 151 ps, a peak power of 6.4 mW (55 mA laser peak forward current) and a repetition rate of 5.3 MHz.

Original languageEnglish
Title of host publicationSmart Photonic and Optoelectronic Integrated Circuits XVIII
EditorsEl-Hang Lee, Louay A. Eldada, Sailing He
PublisherSPIE
ISBN (Electronic)9781628419863
DOIs
StatePublished - 1 Jan 2016
Externally publishedYes
EventSmart Photonic and Optoelectronic Integrated Circuits XVIII - San Francisco, United States
Duration: 16 Feb 201618 Feb 2016

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9751
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceSmart Photonic and Optoelectronic Integrated Circuits XVIII
Country/TerritoryUnited States
CitySan Francisco
Period16/02/1618/02/16

Keywords

  • CMOS integrated circuit
  • Direct modulation
  • Driver circuit
  • Laser source
  • Picosecond lasers
  • Pulse peak power
  • Pulse width
  • Ultrashort current pulses

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