Abstract

We outline a novel method performing all-optical envelope detection of radio-frequency signals for radio-over-fiber links. A high frequency modulated signal with a slower-varying envelope is injected into a DFB laser which, due to gain suppression effects, recovers only the envelope of the optical signal. We characterize the DFB gain suppression effect in terms of injected signal wavelength and power level requirements. System performance is assessed, including experimental bit-error rate results; these illustrate successful envelope detection for a 20 GHz carrier with ASK modulation operating at 2.5 Gbit/second. Preliminary results at 5.5 Gbit/s show significant potential for application in hybrid optical-wireless communications networks.

© 2008 Optical Society of America

Full Article  |  PDF Article

References

  • View by:
  • |
  • |

  1. A. Hirata, T. Nagatsuma, T. Kosugi, H. Takahashi, R. Yamaguchi, F. Nakajima, T. Furuta, H. Ito, H. Sugahara, and Y. Sato, "120-GHz-band millimeter-wave photonic wireless link for 10-Gb/s data transmission," IEEE Trans. Microwave Theory Tech. 54, 1937-1944 (2006).
    [CrossRef]
  2. I. Tafur Monroy, J. Seoane, and P. Jeppesen, "All-optical envelope detection for wireless photonic communication," in Proceedings of 33rd European Conference and Exhibition on Optical Communication (ECOC, Berlin, 2007), pp 173-174.
  3. A. Nirmalathas, D. Novak, C. Lim, R. B. Waterhouse, and D. Castleford, "Fiber networks for wireless applications," in Proceedings of IEEE Lasers and Electro-Optics Society 2000 Annual Meeting (LEOS, Puerto Rico, 2000) pp. 35-36
  4. G. Agrawal and N. Dutta, Semiconductor Lasers, 2nd ed., (Van Nostrand Reinhold, New York, 2003).
    [PubMed]
  5. B. R. Koch, J. S. Barton, M. Masanovic, Z. Hu, J. E. Bowers and D. J. Blumenthal, "Monolithic mode-locked laser and optical amplifier for regenerative pulsed optical clock recovery," IEEE Photon. Technol. Lett. 19, 641-643 (2007).
    [CrossRef]

2007 (1)

B. R. Koch, J. S. Barton, M. Masanovic, Z. Hu, J. E. Bowers and D. J. Blumenthal, "Monolithic mode-locked laser and optical amplifier for regenerative pulsed optical clock recovery," IEEE Photon. Technol. Lett. 19, 641-643 (2007).
[CrossRef]

2006 (1)

A. Hirata, T. Nagatsuma, T. Kosugi, H. Takahashi, R. Yamaguchi, F. Nakajima, T. Furuta, H. Ito, H. Sugahara, and Y. Sato, "120-GHz-band millimeter-wave photonic wireless link for 10-Gb/s data transmission," IEEE Trans. Microwave Theory Tech. 54, 1937-1944 (2006).
[CrossRef]

IEEE Photon. Technol. Lett. (1)

B. R. Koch, J. S. Barton, M. Masanovic, Z. Hu, J. E. Bowers and D. J. Blumenthal, "Monolithic mode-locked laser and optical amplifier for regenerative pulsed optical clock recovery," IEEE Photon. Technol. Lett. 19, 641-643 (2007).
[CrossRef]

IEEE Trans. Microwave Theory Tech. (1)

A. Hirata, T. Nagatsuma, T. Kosugi, H. Takahashi, R. Yamaguchi, F. Nakajima, T. Furuta, H. Ito, H. Sugahara, and Y. Sato, "120-GHz-band millimeter-wave photonic wireless link for 10-Gb/s data transmission," IEEE Trans. Microwave Theory Tech. 54, 1937-1944 (2006).
[CrossRef]

Other (3)

I. Tafur Monroy, J. Seoane, and P. Jeppesen, "All-optical envelope detection for wireless photonic communication," in Proceedings of 33rd European Conference and Exhibition on Optical Communication (ECOC, Berlin, 2007), pp 173-174.

A. Nirmalathas, D. Novak, C. Lim, R. B. Waterhouse, and D. Castleford, "Fiber networks for wireless applications," in Proceedings of IEEE Lasers and Electro-Optics Society 2000 Annual Meeting (LEOS, Puerto Rico, 2000) pp. 35-36

G. Agrawal and N. Dutta, Semiconductor Lasers, 2nd ed., (Van Nostrand Reinhold, New York, 2003).
[PubMed]

Cited By

OSA participates in CrossRef's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (9)

Fig. 1.
Fig. 1.

All-optical envelope detection of wireless signals. EAM: electro-absorption modulator. DFB: distributed feed-back laser. Vbias: bias voltage

Fig. 2.
Fig. 2.

Layout of the experimental setup. OBPF means optical band pass filter, MZM means Mach-Zehnder Modulator. Signal monitoring point (MP) locations are also shown.

Fig. 3.
Fig. 3.

Measured optical emission spectrum of the DFB laser used for external optical injection. The vertical axes have been normalized for convenient comparison. The peak wavelength λC was found to be close to 1551 nm; the first right side mode peak (λHR1) at 1553 nm. Higher side modes were observed at a periodic spectral separation of approximately 1.2 nm. The figure on the right indicates the spectrum observed at MP2 when the 2.5 GHz ASK signal is injected into the DFB at λHR1 and filtered by the OBPF.

Fig. 4.
Fig. 4.

Relationship between input optical power and DFB laser output power (black) and lasing wavelength (circles, blue) at various operating points (color online).

Fig. 5.
Fig. 5.

Results were obtained for baseband system operation, without the 20 GHz carrier. We note the shape of the driving 2.5 Gb/s data source signal (a); the output waveform from the optical transmitter (Measuring Point, MP1) (b); the corresponding DFB output (MP2) (c), and the resulting electrical waveform obtained after 40 Ghz photodetection and filtering with a 1.8 GHz Bessel LPF (MP3) (d)

Fig. 6.
Fig. 6.

Showing signal waveforms at various points in the system in response to a 20 GHz halfwave rectified ASK modulated signal input. The driving data waveform is identical to that of Fig. 5. We present details of the optical transmitter output waveform with different time resolutions (MP1) (a,b). The DFB output (MP2) and the output obtained by photodetection of this signal with a 40 GHz photodiode and filtering of the electrical signal obtained with a 1.8 GHz Bessel lowpass filter (MP3) are also shown as (c) and (d) respectively.

Fig. 7.
Fig. 7.

BER sensitivity for fixed PTL = -7.5 dBm and fixed DFB bias current of 21.10 mA. The baseline performance (black line) is very close to the best performance with the envelope detection of the 20 GHz carrier, 2.5 Gb/s ASK passband signal (red). (Color online)

Fig. 8.
Fig. 8.

Sensitivity analysis of DFB system (for IDFB = 21.10 mA). These results were obtained when the injected signal was at a wavelength λTL = λHR1

Fig. 9.
Fig. 9.

Showing the eye diagrams obtained at system output with increased data rates of 4 Gbit/s (a) and 5.5 Gbit/s (b). A 4.5 GHz Bessel LPF was implemented after photodetector.

Tables (1)

Tables Icon

Table 1. Receiver sensitivity at BER = 10-9 for various PRBS with 20 GHz carrier ON or OFFa

Equations (1)

Equations on this page are rendered with MathJax. Learn more.

8.0 dBm P TL 4.2 dBm

Metrics