Abstract

We report on experimental demonstration of a digital coherent detection link fully based on vertical cavity surface emitting lasers (VCSELs) for the transmitter as well as for the local oscillator light source at the receiver side. We demonstrate operation at 5 Gbps at a 1550 nm wavelength with record receiver sensitivity of −36 dBm after transmission over 40 km standard single mode fiber. Digital signal processing compensates for frequency offset between the transmitter and the local oscillator VCSELs, and for chromatic dispersion. This system allows for uncooled VCSEL operation and fully passive fiber transmission with no use of optical amplification or optical dispersion compensation. The proposed system demonstrates the potential of multi-gigabit coherent passive optical networks with extended reach and increased capacity. Moreover, this is, to the best of our knowledge, the first demonstration of coherent optical transmission systems using a low-cost VCSEL as the local oscillator as well as for the transmitter.

© 2010 OSA

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References

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  1. P. E. Green, “Fiber to the home: the next big broadband thing,” IEEE Commun. Mag . 42, 100-106 (2004)
    [CrossRef]
  2. S. Smolorz, H. Rohde, P. Ossieur, C. Antony, P. D. Townsend, T. De Ridder, B. Baekelandt, X. Z. Qiu, S. Appathurai, H.-G. Krimmel, D. Smith, and A. Poustie, “Next generation access networks: PIEMAN and beyond,” International Conference on Photonics in Switching (PS) (2009).
  3. M. Alfani, J. M. Finochietto, and F. Neri, “Efficient multicast bandwidth allocation in TDM-WDM PONs,” Conference on Optical Fiber Communication (OFC) (2009).
  4. A. D. Ellis, and F. C. Garcia Gunning, “Spectral density enhancement using coherent WDM,” IEEE Photonics Technology Letters (2005).
  5. G. Lachs, S. M. Zaidi, and A. K. Singh, “Sensitivity enhancement using coherent heterodyne detection,” J. Lightwave Technol . 12, 1036-1041 (1994).
    [CrossRef]
  6. X. Zhou, and J. Yu, “Advanced coherent modulation formats and algorithms: higher-order multi-level coding for high-capacity system based on 100 Gbps channel,” Conference on Optical Fiber Communication (OFC) (2010).
  7. S. J. Savory, “Electronic signal processing in optical communications,” Proc. SPIE 7136, 71362C (2008).
    [CrossRef]
  8. S.-Y. Kim, N. Sakurai, H. Kimura, and H. Hadama, “VCSEL-based coherent detection of 10-Gbit/s QPSK signals using digital phase noise cancellation for future optical access systems,” Conference on Optical Fiber Communication (OFC) (2010).
  9. M. Seimetz, “Laser linewidth limitations for optical systems with high-order modulation employing feed forward digital carrier phase estimation,” Conference on Optical Fiber Communication (OFC) (1998).
  10. K. Prince, M. Ma, T. B. Gibbon, and I. Tafur Monroy, “Demonstration of 10.7-Gb/s transmission in 50-km PON with uncooled free-running 1550-nm VCSEL,” Conference on Lasers and Electro-Optics (CLEO) and Quantum Electronics and Laser Science Conference (QELS) (2010).

2008 (1)

S. J. Savory, “Electronic signal processing in optical communications,” Proc. SPIE 7136, 71362C (2008).
[CrossRef]

2004 (1)

P. E. Green, “Fiber to the home: the next big broadband thing,” IEEE Commun. Mag . 42, 100-106 (2004)
[CrossRef]

1994 (1)

G. Lachs, S. M. Zaidi, and A. K. Singh, “Sensitivity enhancement using coherent heterodyne detection,” J. Lightwave Technol . 12, 1036-1041 (1994).
[CrossRef]

Green, P. E.

P. E. Green, “Fiber to the home: the next big broadband thing,” IEEE Commun. Mag . 42, 100-106 (2004)
[CrossRef]

Lachs, G.

G. Lachs, S. M. Zaidi, and A. K. Singh, “Sensitivity enhancement using coherent heterodyne detection,” J. Lightwave Technol . 12, 1036-1041 (1994).
[CrossRef]

Savory, S. J.

S. J. Savory, “Electronic signal processing in optical communications,” Proc. SPIE 7136, 71362C (2008).
[CrossRef]

Singh, A. K.

G. Lachs, S. M. Zaidi, and A. K. Singh, “Sensitivity enhancement using coherent heterodyne detection,” J. Lightwave Technol . 12, 1036-1041 (1994).
[CrossRef]

Zaidi, S. M.

G. Lachs, S. M. Zaidi, and A. K. Singh, “Sensitivity enhancement using coherent heterodyne detection,” J. Lightwave Technol . 12, 1036-1041 (1994).
[CrossRef]

IEEE Commun. Mag (1)

P. E. Green, “Fiber to the home: the next big broadband thing,” IEEE Commun. Mag . 42, 100-106 (2004)
[CrossRef]

J. Lightwave Technol (1)

G. Lachs, S. M. Zaidi, and A. K. Singh, “Sensitivity enhancement using coherent heterodyne detection,” J. Lightwave Technol . 12, 1036-1041 (1994).
[CrossRef]

Proc. SPIE (1)

S. J. Savory, “Electronic signal processing in optical communications,” Proc. SPIE 7136, 71362C (2008).
[CrossRef]

Other (7)

S.-Y. Kim, N. Sakurai, H. Kimura, and H. Hadama, “VCSEL-based coherent detection of 10-Gbit/s QPSK signals using digital phase noise cancellation for future optical access systems,” Conference on Optical Fiber Communication (OFC) (2010).

M. Seimetz, “Laser linewidth limitations for optical systems with high-order modulation employing feed forward digital carrier phase estimation,” Conference on Optical Fiber Communication (OFC) (1998).

K. Prince, M. Ma, T. B. Gibbon, and I. Tafur Monroy, “Demonstration of 10.7-Gb/s transmission in 50-km PON with uncooled free-running 1550-nm VCSEL,” Conference on Lasers and Electro-Optics (CLEO) and Quantum Electronics and Laser Science Conference (QELS) (2010).

S. Smolorz, H. Rohde, P. Ossieur, C. Antony, P. D. Townsend, T. De Ridder, B. Baekelandt, X. Z. Qiu, S. Appathurai, H.-G. Krimmel, D. Smith, and A. Poustie, “Next generation access networks: PIEMAN and beyond,” International Conference on Photonics in Switching (PS) (2009).

M. Alfani, J. M. Finochietto, and F. Neri, “Efficient multicast bandwidth allocation in TDM-WDM PONs,” Conference on Optical Fiber Communication (OFC) (2009).

A. D. Ellis, and F. C. Garcia Gunning, “Spectral density enhancement using coherent WDM,” IEEE Photonics Technology Letters (2005).

X. Zhou, and J. Yu, “Advanced coherent modulation formats and algorithms: higher-order multi-level coding for high-capacity system based on 100 Gbps channel,” Conference on Optical Fiber Communication (OFC) (2010).

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Figures (4)

Fig. 1
Fig. 1

Experimental setup. Digital sampling scope (DSO), digital signal processing (DSP), polarization controller (PC), variable optical attenuator (VOA). The insertion shows the measured combined optical power spectrum of the signal and the LO.

Fig. 2
Fig. 2

Laser linewidth of the VCSEL measured by heterodyne detection with an ECL.

Fig. 3
Fig. 3

Optical eye diagrams. 5 Gbps, Ibias = 13.6 mA, Vpp = 1 V. (a) Back-to-back. (b) After 40 km SSMF

Fig. 4
Fig. 4

BER curves after 40 km SSMF and for B2B configuration. Bit-rate: 5 Gbps, ER: 6.82 dB, LO power: 0 dBm.

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