Optical Subcarrier Generation

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Optical Subcarrier Generation

• Long Xiao
• 03/12/2003

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Outline

• Optical Subcarrier generate
• Optical phase locked loop (OPLL)

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Four Methods of Optical Generation of a
Millimeter-wave subcarrier

• Direct modulation of a laser diode.
• External modulation.
• Laser mode locking.
• Heterodyning of two single-mode lasers.

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A Tunable Millimeter-Wave Optical Transmitter
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Photograph of Two Laser Module
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Spectrum of the Heterodyne Signal
The 0.3 nm wavelength separation between the
outputs of two microchip-lasers corresponds to 90
GHz heterodyne signal.
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Performance of the Heterodyne System

• Continuous tuning range (CTR) 45 GHz.
• Sensitivity 13.4 MHz/ V.
• Phase noise -90 dBc/Hz at 10 kHz offset.

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Diagram of the Optical Phase Locked Loop With
Reference Signal
Master Laser
Optical Coupler
Photodector
Reference Signal
Slave Laser
Loop Filter
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Diagram of the Phase Locked Loop With Delay Line
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Packaged Optical Phase Locked Loop
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References

• 1 Y. LI, A. J. C. Vieira, S. M. Goldwasser, P.
  R. Herczfeld, Rapidly Tunable
  Millimeter-Wave Optical Transmitter for
  Lidar/Radar, IEEE Transactions on Microwave
  Theory and Techniques, special issue on microwave
  and millimeter-wave photonics, Vol. 49, No. 10,
  pp. 2048-2054, October 2001.
• 2 Y. Li, S. Goldwasser, P. R. Herczfeld,
  Optical Generated Dynamically Tunable,Low Noise
  Millimeter Wave Signals Using Microchip Solid
  Satte Lasers.
• 3 Yao, X. Steve, et al, Optoelectronic
  oscillator for photonic systems, IEEE Journal of
  Quantum Electronics, v32, n7, pp 1141-1149, Jul,
  1996.
• 4 Yao, X. Steve, et al, Multiloop
  optoelectronic oscillator, IEEE Journal of
  Quantum Electronics, v36, n1, pp 79-84, 2000.
• 5 R. T. Ramos, A. J. Seeds, Delay, Linewidth
  and Bandwidth Limitations in Optical Phase-locked
  Loop Design, Electronics Letters, Vol. 26, No.
  6, pp 389-391, March 1990.
• 6 A. C. Bordonalli, C. Walton, A. J. Seeds,
  High-Performance Homodyne Optical Injection
  Phase-Lock Loop Using Wide-Linewidth
  Semiconductor Lasers, IEEE Photonics Technology
  Letters, Vol. 8, No. 9, September 1996.

12
References

• 7 R. T. Ramos and A. J. Seeds, comparison
  between first-order and second-order optical
  phase-lock loops, IEEE microwave and guided wave
  letters, vol. 4, no. 1. January 1994.
• 8 L. N. Langley, M. D. Elkin, C. Edge, M. J.
  Wale, U. Gliese, X. Huang, and A. J. Seeds,
  packaged semiconductor laser optical
  phase-locked loop (OPLL) for Photonic generation,
  processing and transmission of microwave signals.
  IEEE Transcations on microwave theory and
  techniques, vol. 47, no. 7, July 1999.
• 9 L. G. Kazovsky, and D. A. Atlas, A 1320 nm
  experimental optical phase-locked loop, IEEE
  Photonics technology letters, vol. 1. No. 11,
  November 1989.
• 10 L. G. Kazovsky, and B. Jensen, experimental
  relative frequency stabilization of a set of
  lasers using optical phase-locked loops, IEEE
  Photonics technology letters, vol. 2. No. 7, July
  1990.
• 11 L. G. Kazovsky, and D. A. Atlas, A 1320-nm
  experimental optical phase-locked loop
  performance investigation and PSK homodyne
  experiments at 140 Mb/s and 2 Gb/s. Journal of
  Lightwave technology, vol. 8. No. 9. September
  1990.