Abstract

A homodyne coherent receiver for ultra-dense WDM-PON with off the shelf components is presented. It consists of a conventional DFB, phase switched clock signal, an optical coupler instead of a 90° hybrid, balanced photodetectors and digital signal processing. The phase swing for a DBPSK signal was optimized and the performance was experimentally evaluated in terms of the sensitivity for several laser linewidths. The acceptable frequency offset and clock time delay was also assessed. The results exhibit a sensitivity of −48 dBm at a BER of 10−3 and indicate a high tolerance to phase noise.

© 2012 OSA

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References

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  1. K. Y. Cho, U. H. Hong, and A. Agata, “10-Gb/s, 80-km reach RSOA-based WDM PON employing QPSK signal and self-homodyne receiver,” Proc. OFC'12, paper OW1B.1, (2012)
  2. R. Rodes, N. Cheng, J. B. Jensen, and I. Tafur, “10 Gb/s real-time all-VCSEL low complexity coherent scheme for PONs,” Proc. OFC’12, paper OTh4G.2 (2012)
  3. D. Lavery, R. Maher, D. Millar, B. C. Thomsen, P. Bayvel, and S. Savory, “Demonstration of 10~Gbit/s colorless coherent PON incorporating tunable DS-DBR lasers and low-complexity parallel DSP,” Proc. OFC’12, paper PDP5B.10 (2012)
  4. H. Rohde, S. Smolorz, S. Wey, and E. Gottwald, “Coherent optical access networks,” Proc. OFC'11, paper OTuB1 (2011)
  5. B. Schrenk, J. M. Fabrega, C. Kazmierski, J. Lázaro, and J. Prat, “SOA/REAM as vector modulator for QAM upstream,” Proc. OFC'11, paper OThK1 (2011)
  6. L. G. Kazovsky, G. Kalogerakis, and W. Tao, “Homodyne phase-shift-keying systems: past challenges and future opportunities,” J. Lightwave Technol.12(24), 4876–4884 (2006).
    [CrossRef]
  7. J. Prat and J. M. Fabrega, “New homodyne receiver with electronic I&Q differential demodulation,” Proc. ECOC'05, paper We4.P104, (2005)
  8. J. M. Fabrega and J. Prat, “Experimental investigation of channel crosstalk in a time-switched phase-diversity optical homodyne receiver,” Opt. Lett.34(4), 452–454 (2009).
    [CrossRef] [PubMed]
  9. J. M. Fabrega and J. Prat, “Homodyne receiver prototype with time-switching phase diversity and feedforward analog processing,” Opt. Lett.32(5), 463–465 (2007).
    [CrossRef] [PubMed]
  10. I. Cano, M. C. Santos, V. Polo, and J. Prat, “Dimensioning of OFDMA PON with non-preselected-independent ONUs sources and wavelength control,” Proc. ECOC'11, Tu.E.C.2. (2011)
  11. D. Piehler, “PICs in PONs,” Proc. OFC'12, paper NTu1J.6. (2012)
  12. A. Ramaswamy, L. A. Johansson, J. Klamkin, C. Sheldon, H. F. Chou, M. J. Rodwell, L. A. Coldren, and J. E. Bowers, “Coherent receiver based on a broadband optical phase-lock loop,” Proc. OFC’07, paper PDP3, (2007)

2009 (1)

2007 (1)

2006 (1)

L. G. Kazovsky, G. Kalogerakis, and W. Tao, “Homodyne phase-shift-keying systems: past challenges and future opportunities,” J. Lightwave Technol.12(24), 4876–4884 (2006).
[CrossRef]

Fabrega, J. M.

Kalogerakis, G.

L. G. Kazovsky, G. Kalogerakis, and W. Tao, “Homodyne phase-shift-keying systems: past challenges and future opportunities,” J. Lightwave Technol.12(24), 4876–4884 (2006).
[CrossRef]

Kazovsky, L. G.

L. G. Kazovsky, G. Kalogerakis, and W. Tao, “Homodyne phase-shift-keying systems: past challenges and future opportunities,” J. Lightwave Technol.12(24), 4876–4884 (2006).
[CrossRef]

Prat, J.

Tao, W.

L. G. Kazovsky, G. Kalogerakis, and W. Tao, “Homodyne phase-shift-keying systems: past challenges and future opportunities,” J. Lightwave Technol.12(24), 4876–4884 (2006).
[CrossRef]

J. Lightwave Technol. (1)

L. G. Kazovsky, G. Kalogerakis, and W. Tao, “Homodyne phase-shift-keying systems: past challenges and future opportunities,” J. Lightwave Technol.12(24), 4876–4884 (2006).
[CrossRef]

Opt. Lett. (2)

Other (9)

J. Prat and J. M. Fabrega, “New homodyne receiver with electronic I&Q differential demodulation,” Proc. ECOC'05, paper We4.P104, (2005)

I. Cano, M. C. Santos, V. Polo, and J. Prat, “Dimensioning of OFDMA PON with non-preselected-independent ONUs sources and wavelength control,” Proc. ECOC'11, Tu.E.C.2. (2011)

D. Piehler, “PICs in PONs,” Proc. OFC'12, paper NTu1J.6. (2012)

A. Ramaswamy, L. A. Johansson, J. Klamkin, C. Sheldon, H. F. Chou, M. J. Rodwell, L. A. Coldren, and J. E. Bowers, “Coherent receiver based on a broadband optical phase-lock loop,” Proc. OFC’07, paper PDP3, (2007)

K. Y. Cho, U. H. Hong, and A. Agata, “10-Gb/s, 80-km reach RSOA-based WDM PON employing QPSK signal and self-homodyne receiver,” Proc. OFC'12, paper OW1B.1, (2012)

R. Rodes, N. Cheng, J. B. Jensen, and I. Tafur, “10 Gb/s real-time all-VCSEL low complexity coherent scheme for PONs,” Proc. OFC’12, paper OTh4G.2 (2012)

D. Lavery, R. Maher, D. Millar, B. C. Thomsen, P. Bayvel, and S. Savory, “Demonstration of 10~Gbit/s colorless coherent PON incorporating tunable DS-DBR lasers and low-complexity parallel DSP,” Proc. OFC’12, paper PDP5B.10 (2012)

H. Rohde, S. Smolorz, S. Wey, and E. Gottwald, “Coherent optical access networks,” Proc. OFC'11, paper OTuB1 (2011)

B. Schrenk, J. M. Fabrega, C. Kazmierski, J. Lázaro, and J. Prat, “SOA/REAM as vector modulator for QAM upstream,” Proc. OFC'11, paper OThK1 (2011)

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Figures (7)

Fig. 1
Fig. 1

Generic PON architecture.

Fig. 2
Fig. 2

(a) Receiver module schematics, (b) BER against clock delay with respect to Tb

Fig. 3
Fig. 3

I&Q processing (a) method 1and (b) method 2 schematics, (c) BER against SNR evaluation for both methods.

Fig. 4
Fig. 4

Experimental set-up

Fig. 5
Fig. 5

BER against phase swing for several received optical powers, (a) experimental results, (b) simulation results with ideal (solid) and offset (dotted) clock signal with 100kHz laser linewidth

Fig. 6
Fig. 6

Receiver sensitivity for several phase swings.

Fig. 7
Fig. 7

(a) Receiver sensitivity for several linewidths, (b) Sensitivity penalty against frequency offset between Tx and Rx lasers

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