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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 17 — Jun. 10, 2007
  • pp: 3546–3560

New approach for the design of an optical square pulse generator

Nam Quoc Ngo and Le Nguyen Binh  »View Author Affiliations

Applied Optics, Vol. 46, Issue 17, pp. 3546-3560 (2007)

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What is believed to be a new approach for the design and analysis of a reconfigurable optical square pulse generator using the concept of temporal optical integration and the digital signal processing method is presented. The reconfigurable square pulse generator is synthesized using compact active semiconductor-based waveguide technology, and it consists simply of the cascade of a tunable microring resonator (or a tunable all-pole filter) and a tunable asymmetrical Mach–Zehnder interferometer (or a tunable all-zero filter). The reconfigurable generator can convert an input picosecond pulse (i.e., soliton or Gaussian pulse) into an optical square pulse. The pulse width of the generated square pulse can be adjusted by controlling the time delay of a variable delay element in the tunable all-zero filter. The reconfigurable generator can convert an input picosecond pulse train into return-to-zero (RZ) and non-return-to-zero (NRZ) signals with square pulse shapes. The repetition rates of the generated RZ and NRZ signals can be varied by adjusting the bit period of the input picosecond pulse train, the input pulse width, and the time delay of the variable delay element. The effect of the deviation of the parameter values on the generator performance is also studied.

© 2007 Optical Society of America

OCIS Codes
(070.1170) Fourier optics and signal processing : Analog optical signal processing
(130.0130) Integrated optics : Integrated optics
(230.0230) Optical devices : Optical devices

ToC Category:
Integrated Optics

Original Manuscript: August 23, 2006
Revised Manuscript: December 4, 2006
Manuscript Accepted: January 12, 2007
Published: May 18, 2007

Nam Quoc Ngo and Le Nguyen Binh, "New approach for the design of an optical square pulse generator," Appl. Opt. 46, 3546-3560 (2007)

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  1. S. Kodama and S. Wabnitz, "Compensation of NRZ signal distortion by initial frequency shifting," Electron. Lett. 31, 1761-1762 (1995). [CrossRef]
  2. T. Morioka, S. Kawanishi, H. Takara, and M. Saruwatari, "Multiple-output, 100 Gbits all-optical demultiplexer based on multichannel four-wave mixing pumped by a linearly-chirped square pulse," Electron. Lett. 30, 1959-1960 (1994). [CrossRef]
  3. J. H. Lee, P. C. Teh, P. Petropoulos, M. Ibsen, and D. J. Richardson, "All-optical modulation and demultiplexing systems with significant timing jitter tolerance through incorporation of pulse-shaping fiber Bragg gratings," IEEE Photon. Technol. Lett. 14, 203-205 (2002). [CrossRef]
  4. A. L. J. Teixeira, P. S. André, M. Lima, J. F. da Rocha, and J. L. Pinto, "Asynchronous optical performance monitor techniques for DWDM optical networks," in Proceedings of Fourth International Conference on Transparent Optical Networks (ICTON, 2002), Vol. 1, pp. 1-5.
  5. R. Llorente, J. H. Lee, P. J. Almeida, M. Ibsen, D. J. Richardson, J. Marti, and F. Ramos, "Novel orthogonal wavelength division multiplexing (OWDM) scheme: theory and experiment," in Proceedings of Sixteenth Annual Meeting of IEEE (LEOS, 2003), Vol. 2, pp. 547-548.
  6. K. Takiguchi, K. Okamoto, T. Kominato, H. Takahashi, and T. Shibata, "Flexible pulse waveform generation using silica-waveguide-based spectrum synthesis circuit," Electron. Lett. 40, 537-538 (2004). [CrossRef]
  7. D. U. Noske, N. Pandit, and J. R. Taylor, "Picosecond square pulse generation using nonlinear fibre loop mirror," Electron. Lett. 28, 908-909 (1992). [CrossRef]
  8. S. Osawa, N. Wada, K. Kitayama, and W. Chujo, "Arbitrarily-shaped optical pulse train synthesis using weight/phase-programmable 32-tapped delay line waveguide filter," Electron. Lett. 37, 1356-1357 (2001). [CrossRef]
  9. S. Longhi, M. Marano, P. Laporta, and V. Pruneri, "Multiplication and reshaping of high-repetition-rate optical pulse trains using highly dispersive fiber Bragg gratings," IEEE Photon. Technol. Lett. 12, 1498-1500 (2000). [CrossRef]
  10. N. Q. Ngo, "Optical integrator for optical dark soliton detection and pulse shaping," Appl. Opt. 45, 6785-6791 (2006). [CrossRef] [PubMed]
  11. G. F. Franklin, J. D. Powell, and M. L. Workman, Digital Control of Dynamic Systems, 2nd ed. (Addison-Wesley, 1990).
  12. W. J. Tompkins and J. G. Webster, eds., Design of Microcomputers-Based Medical Instrumentation (Prentice-Hall, 1981), Chap. 3.
  13. A. V. Oppenheim and R. W. Schafer, Discrete-Time Signal Processing (Prentice-Hall, 1989).
  14. C. K. Madsen and J. H. Zhao, Optical Filter Design and Analysis: A Signal Processing Approach (Wiley, 1999).
  15. N. Q. Ngo and L. N. Binh, "Novel realization of monotonic Butterworth-type lowpass, highpass and bandpass optical filters using phase-modulated fiber-optic interferometers and ring resonators," J. Lightwave Technol. 12, 827-841 (1994). [CrossRef]
  16. K. Djordev, S.-J. Choi, S.-J. Choi, and P. D. Dapkus, "Gain trimming of the resonant characteristics in vertically coupled InP microdisk switches," Appl. Phys. Lett. 80, 3467-3469 (2002). [CrossRef]
  17. S. J. Choi, Z. Peng, Q. Yang, S. J. Choi, and P. D. Dapkus, "An eight-channel demultiplexing switch array using vertically coupled active semiconductor microdisk resonators," IEEE Photon. Technol. Lett. 16, 2517-2519 (2004). [CrossRef]
  18. K. Djordev, S.-J. Choi, S.-J. Choi, and P. D. Dapkus, "Active semiconductor microdisk devices," J. Lightwave Technol. 20, 105-113 (2002). [CrossRef]
  19. K. Djordev, S.-J. Choi, S.-J. Choi, and P. D. Dapkus, "Study of the effects of the geometry on the performance of vertically coupled InP microdisk resonators," J. Lightwave Technol. 20, 1485-1492 (2002). [CrossRef]
  20. N. Q. Ngo and L. N. Binh, "Synthesis of tunable optical waveguide filters using digital signal processing technique," J. Lightwave Technol. 24, 3520-3531 (2006). [CrossRef]
  21. M. S. Rasras, C. K. Madsen, M. A. Cappuzzo, E. Chen, L. T. Gomez, E. J. Laskowski, A. Griffin, A. Wong-Foy, A. Gasparyan, A. Kasper, J. L. Grange, and S. S. Patel, "Integrated resonance-enhanced variable optical delay lines," IEEE Photon. Technol. Lett. 17, 834-836 (2005). [CrossRef]

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