S. J. Savory, "Digital coherent optical receivers:
Algorithms and subsystems," IEEE J. Sel. Topics
Quantum Electron. 16, 1164-1179 (2010).

X. Liu, S. Chandrasekhar, B. Zhu, P. Winzer, A. Gnauck, D. Peckham, "448-Gb/s reduced-guard-interval CO-OFDM
transmission over 2000 km of ultra-large-area fiber and five 80-GHz-Grid ROADMs," J. Lightw. Technol. 29, 483-490 (2010).

D. Hillerkuss, M. Winter, M. Teschke, A. Marculescu, J. Li, G. Sigurdsson, K. Worms, S. B. Ezra, N. Narkiss, W. Freude, J. Leuthold, "Simple all-optical FFT scheme enabling Tbit/s real-time
signal processing," Opt. Exp. 18, 9324-9340 (2010).

Y. Tang, W. Shieh, B. S. Krongold, "DFT-spread OFDM for fiber nonlinearity mitigation," IEEE Photon. Technol. Lett. 22, 1250-1252 (2010).

X. Chen, W. Shieh, "Closed-form expressions for nonlinear transmission
performance of densely spaced coherent optical OFDM systems," Opt. Exp. 18, 19039-19054 (2010).

E. IP, "Nonlinear compensation using
backpropagation for polarization-multiplexed transmission," J. Lightw. Technol. 28, 939-951 (2010).

B. Spinnler, "Equalizer design and complexity
for digital coherent receivers," IEEE J. Sel.
Opt. Quantum Electron. 16, 1180-1192 (2010).

N. Kaneda, Q. Yang;, X. Liu, S. Chandrasekhar, W. Shieh, Y. K. Chen, "Real-time
2.5 GS/s coherent optical receiver for 53.3-Gb/s sub-banded OFDM," J. Lightw. Technol. 28, 494-501 (2010).

R. P. Giddings, X. Q. Jin, E. Hugues-Salas, E. Giacoumidis, J. L. Wei, J. M. Tang, "Experimental demonstration
of a record high 11.25 Gb/s real-time optical OFDM transceiver supporting
25 km SMF end-to-end transmission in simple IMDD systems," Opt. Exp. 18, 5541-5555 (2010).

Q. Yang, S. Chen, Y. Ma, W. Shieh, "Real-time reception of multi-gigabit coherent optical OFDM
signals," Opt. Exp. 17, 7985-7992 (2009).

S. Chen, Q. Yang, Y. Ma, W. Shieh, "Real-time multi-gigabit receiver for coherent optical MIMO-OFDM
signals," J. Lightw. Technol. 27, 3699-3704 (2009).

T. Kobayashi, A. Sano, E. Yamada, E. Yoshida, Y. Miyamoto, "Over 100 Gb/s electro-optically multiplexed
OFDM for high-capacity optical transport network," J.
Lightw. Technol. 27, 3714-3720 (2009).

X. Q. Jin, R. P. Giddings, E. Hugues-Salas, J. M. Tang, "Real-time demonstration of
128-QAM-encoded optical OFDM transmission with a 5.25 bit/s/Hz spectral efficiency
in simple IMDD systems utilizing directly modulated DFB lasers," Opt. Exp. 17, 20484-20493 (2009).

S. L. Jansen, I. Morita, T. C. W. Schenk, H. Tanaka, "121.9-Gb/s PDM-OFDM transmission
with 2-b/s/Hz spectral efficiency over 1000 km of SSMF," J. Lightw. Technol. 27, 177-188 (2009).

M. Mayrock, H. Haunstein, "Monitoring of linear and nonlinear
signal distortion in coherent optical OFDM transmission," J. Lightw. Technol. 27, 3560-3566 (2009).

X. Liu, F. Buchali, R. W. Tkach, "Improving the nonlinear tolerance
of polarization-division-multiplexed CO-OFDM in long-haul fiber transmission," J. Lightw. Technol. 27, 3632-3640 (2009).

Y. Tang, W. Shieh, "Coherent optical OFDM transmission up to
1 Tb/s per channel," J. Lightw. Technol. 27, 3511-3517 (2009).

I. Djordjevic, M. Arabaci, L. Minkov, "Next generation FEC for high-capacity
communication in optical transport networks," J.
Lightw. Technol. 27, 3518-3530 (2009).

H. Sun, K. Wu, K. Roberts, "Real-time measurements of a 40 Gb/s coherent
system," Opt. Exp. 16, 873-879 (2008).

X. Yi, W. Shieh, Y. Ma, "Phase noise effects on high spectral efficiency coherent
optical OFDM transmission," J. Lightw. Technol. 26, 1309-1316 (2008).

W. Shieh, H. Bao, Y. Tang, "Coherent optical OFDM: Theory and design," Opt. Exp. 16, 841-859 (2008).

K. Lee, C. T. D. Thai, J. K. Rhee, "All optical discrete Fourier
transform processor for 100 Gbps OFDM transmission," Opt.
Exp. 16, 4023-4028 (2008).

M. Schuster, S. Randel, C. A. Bunge, S. C. J. Lee, F. Breyer, B. Spinnler, K. Petermann, "Spectrally efficient compatible
single-sideband modulation for OFDM transmission with direct detection," IEEE Photon. Technol. Lett. 20, 670-672 (2008).

S. C. J. Lee, F. Breyer, S. Randel, H. P. A. van den Boom, A. M. J. Koonen, "High-speed transmission over
multimode fiber using discrete multitone modulation [invited]," J. Opt. Netw. 7, 183-196 (2008).

X. Q. Jin, J. M. Tang, P. S. Spencer, K. A. Shore, "Optimization of adaptively
modulated optical OFDM modems for multimode fiber-based local area networks
[invited]," J. Opt. Netw. 7, 198-214 (2008).

Q. Yang, W. Shieh, Y. Ma, "Bit and power loading for coherent optical OFDM," IEEE Photon. Technol. Lett. 20, 1305-1307 (2008).

X. Liu, F. Buchali, "Intra-symbol frequency-domain
averaging based channel estimation for coherent optical OFDM," Opt. Exp. 16, 21944-21957 (2008).

W. Shieh, Q. Yang, Y. Ma, "107 Gb/s coherent optical OFDM transmission over 1000-km
SSMF fiber using orthogonal band multiplexing," Opt.
Exp. 16, 6378-6386 (2008).

M. Nazarathy, J. Khurgin, R. Weidenfeld, Y. Meiman, P. Cho, R. Noe, I. Shpantzer, V. Karagodsky, "Phased-array cancellation of nonlinear FWM in coherent OFDM
dispersive multi-span links," Opt. Exp. 16, 15777-15810 (2008).

Y. Benlachtar, G. Gavioli, V. Mikhailov, R. I. Killey, "Experimental investigation
of SPM in long-haul direct-detection OFDM systems," Opt.
Exp. 16, 15477-15482 (2008).

A. J. Lowery, "Fiber nonlinearity pre- and
post-compensation for long-haul optical links using OFDM," Opt. Exp. 15, 12965-12970 (2007).

W. Shieh, X. Yi, Y. Ma, Y. Tang, "Theoretical and experimental study on PMD-supported transmission
using polarization diversity in coherent optical OFDM systems," Opt. Exp. 15, 9936-9947 (2007).

W. Shieh, X. Yi, Y. Tang, "Transmission experiment of multi-gigabit coherent optical
OFDM systems over 1000 km SSMF fiber," Electron.
Lett. 43, 183-185 (2007).

I. B. Djordjevic, B. Vasic, M. A. Neifeld, "LDPC-coded OFDM for optical communication
systems with direct detection," IEEE J. Sel.
Topics Quantum Electron. 13, 1446-1454 (2007).

G. Goldfarb, G. F. Li, M. G. Taylor, "Orthogonal wavelength-division multiplexing
using coherent detection," IEEE Photon. Technol.
Lett. 19, 2015-2017 (2007).

A. J. Lowery, S. Wang, M. Premaratne, "Calculation of power limit due to fiber
nonlinearity in optical OFDM systems," Opt.
Exp. 15, 13282-13287 (2007).

J. M. Tang, P. M. Lane, K. A. Shore, "High-speed transmission of
adaptively modulated optical OFDM signals over multimode fibers using directly
modulated DFBs," J. Lightw. Technol. 24, 429-441 (2006).

W. Shieh, C. Athaudage, "Coherent optical orthogonal
frequency division multiplexing," Electron.
Lett. 42, 587-589 (2006).

I. B. Djordjevic, B. Vasic, "Orthogonal frequency division multiplexing
for high-speed optical transmission," Opt. Exp. 14, 3767-3775 (2006).

T. Maeda, N. Matsuno, S. Hori, T. Yamase, T. Tokairin, K. Yanagisawa, H. Yano, R. Walkington, K. Numata, N. Yoshida, Y. Takahashi, H. Hida, "A low-power dual-band triple-mode WLAN CMOS transceiver," IEEE J. Solid-State Circuits 41, 2481-2490 (2006).

H. G. Weber, S. Ferber, M. Kroh, C. Schmidt-Langhorst, R. Ludwig, V. Marembert, C. Boerner, F. Futami, S. Watanabe, C. Schubert, "Single channel 1.28 Tbit/s and 2.56 Tbit/s
DQPSK transmission," Electron. Lett. 42, 178-179 (2006).

A. Lowery, J. Armstrong, "10 Gbit/s multimode fiber link
using power-efficient orthogonal-frequency-division multiplexing," Opt. Exp. 13, 10003-10009 (2005).

A. D. Ellis, F. C. G. Gunning, "Spectral density enhancement
using coherent WDM," IEEE Photon. Technol. Lett. 17, 504-506 (2005).

C. Doan, S. Emami, A. Niknejad, R. Brodersen, "Millimeter-wave CMOS design," IEEE J. Solid-State Circuits 40, 144-155 (2005).

J. Tang, "The channel capacity of a multispan
DWDM system employing dispersive nonlinear optical fibers and an ideal coherent
optical receiver," J. Lightw. Technol. 20, 1095-1101 (2002).

P. P. Mitra, J. B. Stark, "Nonlinear limits to the information
capacity of optical fibre communications," Nauture 411, 1027-1030 (2001).

R. You, J. M. Kahn, "Average power reduction techniques
for multiple-subcarrier intensity-modulated optical signals," IEEE Trans. Commun. 49, 2164-2171 (2001).

B. J. Dixon, R. D. Pollard, S. Iezekeil, "Orthogonal frequency-division
multiplexing in wireless communication systems with multimode fiber feeds," IEEE Trans. Microw. Theory Techn. 49, 1404-1409 (2001).

K. Kitayama, "Highly spectrum efficient OFDM/PDM
wireless networks by using optical SSB modulation," J.
Lightw. Technol. 16, 969-976 (1998).

Q. Shi, "Error performance of OFDM-QAM
in subcarrier multiplexed fiber-optic transmission," IEEE
Photon. Technol. Lett. 9, 845-847 (1997).

N. Gisin, B. Huttner, "Combined effects of polarization
mode dispersion and polarization dependent losses in optical fibers," Opt. Commun. 142, 119-125 (1997).

T. M. Schmidl, D. C. Cox, "Robust frequency and timing
synchronization for OFDM," IEEE Trans. Commun. 45, 1613-1621 (1997).

Q. Pan, R. J. Green, "Bit-error-rate performance
of lightwave hybrid AM/OFDM systems with comparison with AM/QAM systems in
the presence of clipping impulse noise," IEEE
Photon. Technol. Lett. 8, 278-280 (1996).

J. Mitola, "The software radio architecture," IEEE Commun. Mag. 33, 26-38 (1995).

P. S. Chow, J. M. Cioffi, J. A. C. Bingham, "A practical discrete multitone
transceiver loading algorithm for data transmission over spectrally shaped
channels," IEEE Trans. Commun. 43, 773-775 (1995).

T. Pollet, M. Van Bladel, M. Moeneclaey, "BER sensitivity of OFDM systems
to carrier frequency offset and wiener phase noise," IEEE
Trans. Commun. 43, 191-193 (1995).

P. H. Moose, "A technique for orthogonal
frequency division multiplexing frequency offset correction," IEEE Trans. Commun. 42, 2908-2914 (1994).

P. Duhamel, H. Hollmann, "Split-radix FFT algorithm," IET Elect. Lett. 20, 14-16 (1984).

R. Wyatt, W. J. Devlin, "10 kHz linewidth 1.5 um InGaAsP
external cavity laser with 55 nm tuning range," IET
Elect. Lett. 19, 110-112 (1983).

S. B. Weinsten, P. M. Ebert, "Data transmission by frequency-division
multiplexing using the discrete fourier transform," IEEE
Trans. Commun. COM-19, 628-634 (1971).

R. W. Chang, "Synthesis of band-limited orthogonal
signals for multichannel data transmission," Bell
Syst. Tech. J. 45, 1775-1796 (1966).

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rate data modem for HF radio," AIEE Trans. 79, 248-255 (1960).

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binary transmission system," AIEE Trans. 76, 723-728 (1958).

C. E. Shannon, "A mathematical theory of communication," Bell Syst. Tech. J. 27, (1948).

M. S. Zimmerman, A. L. Kirsch, "AN/GSC-10 (KATHRYN) variable
rate data modem for HF radio," AIEE Trans. 79, 248-255 (1960).

R. R. Mosier, R. G. Clabaugh, "Kineplex, a bandwidth-efficient
binary transmission system," AIEE Trans. 76, 723-728 (1958).

R. W. Chang, "Synthesis of band-limited orthogonal
signals for multichannel data transmission," Bell
Syst. Tech. J. 45, 1775-1796 (1966).

C. E. Shannon, "A mathematical theory of communication," Bell Syst. Tech. J. 27, (1948).

W. Shieh, C. Athaudage, "Coherent optical orthogonal
frequency division multiplexing," Electron.
Lett. 42, 587-589 (2006).

W. Shieh, X. Yi, Y. Tang, "Transmission experiment of multi-gigabit coherent optical
OFDM systems over 1000 km SSMF fiber," Electron.
Lett. 43, 183-185 (2007).

H. G. Weber, S. Ferber, M. Kroh, C. Schmidt-Langhorst, R. Ludwig, V. Marembert, C. Boerner, F. Futami, S. Watanabe, C. Schubert, "Single channel 1.28 Tbit/s and 2.56 Tbit/s
DQPSK transmission," Electron. Lett. 42, 178-179 (2006).

J. Armstrong, A. J. Lowery, "Power efficient optical OFDM," Electron. Lett. 26, 370-372.

Q. Pan, R. J. Green, "Bit-error-rate performance
of lightwave hybrid AM/OFDM systems with comparison with AM/QAM systems in
the presence of clipping impulse noise," IEEE
Photon. Technol. Lett. 8, 278-280 (1996).

Q. Shi, "Error performance of OFDM-QAM
in subcarrier multiplexed fiber-optic transmission," IEEE
Photon. Technol. Lett. 9, 845-847 (1997).

S. B. Weinsten, P. M. Ebert, "Data transmission by frequency-division
multiplexing using the discrete fourier transform," IEEE
Trans. Commun. COM-19, 628-634 (1971).

T. Pollet, M. Van Bladel, M. Moeneclaey, "BER sensitivity of OFDM systems
to carrier frequency offset and wiener phase noise," IEEE
Trans. Commun. 43, 191-193 (1995).

J. Mitola, "The software radio architecture," IEEE Commun. Mag. 33, 26-38 (1995).

B. Spinnler, "Equalizer design and complexity
for digital coherent receivers," IEEE J. Sel.
Opt. Quantum Electron. 16, 1180-1192 (2010).

I. B. Djordjevic, B. Vasic, M. A. Neifeld, "LDPC-coded OFDM for optical communication
systems with direct detection," IEEE J. Sel.
Topics Quantum Electron. 13, 1446-1454 (2007).

S. J. Savory, "Digital coherent optical receivers:
Algorithms and subsystems," IEEE J. Sel. Topics
Quantum Electron. 16, 1164-1179 (2010).

C. Doan, S. Emami, A. Niknejad, R. Brodersen, "Millimeter-wave CMOS design," IEEE J. Solid-State Circuits 40, 144-155 (2005).

T. Maeda, N. Matsuno, S. Hori, T. Yamase, T. Tokairin, K. Yanagisawa, H. Yano, R. Walkington, K. Numata, N. Yoshida, Y. Takahashi, H. Hida, "A low-power dual-band triple-mode WLAN CMOS transceiver," IEEE J. Solid-State Circuits 41, 2481-2490 (2006).

G. Goldfarb, G. F. Li, M. G. Taylor, "Orthogonal wavelength-division multiplexing
using coherent detection," IEEE Photon. Technol.
Lett. 19, 2015-2017 (2007).

Q. Yang, W. Shieh, Y. Ma, "Bit and power loading for coherent optical OFDM," IEEE Photon. Technol. Lett. 20, 1305-1307 (2008).

M. Schuster, S. Randel, C. A. Bunge, S. C. J. Lee, F. Breyer, B. Spinnler, K. Petermann, "Spectrally efficient compatible
single-sideband modulation for OFDM transmission with direct detection," IEEE Photon. Technol. Lett. 20, 670-672 (2008).

A. D. Ellis, F. C. G. Gunning, "Spectral density enhancement
using coherent WDM," IEEE Photon. Technol. Lett. 17, 504-506 (2005).

Y. Tang, W. Shieh, B. S. Krongold, "DFT-spread OFDM for fiber nonlinearity mitigation," IEEE Photon. Technol. Lett. 22, 1250-1252 (2010).

P. S. Chow, J. M. Cioffi, J. A. C. Bingham, "A practical discrete multitone
transceiver loading algorithm for data transmission over spectrally shaped
channels," IEEE Trans. Commun. 43, 773-775 (1995).

R. You, J. M. Kahn, "Average power reduction techniques
for multiple-subcarrier intensity-modulated optical signals," IEEE Trans. Commun. 49, 2164-2171 (2001).

P. H. Moose, "A technique for orthogonal
frequency division multiplexing frequency offset correction," IEEE Trans. Commun. 42, 2908-2914 (1994).

T. M. Schmidl, D. C. Cox, "Robust frequency and timing
synchronization for OFDM," IEEE Trans. Commun. 45, 1613-1621 (1997).

B. J. Dixon, R. D. Pollard, S. Iezekeil, "Orthogonal frequency-division
multiplexing in wireless communication systems with multimode fiber feeds," IEEE Trans. Microw. Theory Techn. 49, 1404-1409 (2001).

R. Wyatt, W. J. Devlin, "10 kHz linewidth 1.5 um InGaAsP
external cavity laser with 55 nm tuning range," IET
Elect. Lett. 19, 110-112 (1983).

P. Duhamel, H. Hollmann, "Split-radix FFT algorithm," IET Elect. Lett. 20, 14-16 (1984).

K. Kitayama, "Highly spectrum efficient OFDM/PDM
wireless networks by using optical SSB modulation," J.
Lightw. Technol. 16, 969-976 (1998).

I. Djordjevic, M. Arabaci, L. Minkov, "Next generation FEC for high-capacity
communication in optical transport networks," J.
Lightw. Technol. 27, 3518-3530 (2009).

T. Kobayashi, A. Sano, E. Yamada, E. Yoshida, Y. Miyamoto, "Over 100 Gb/s electro-optically multiplexed
OFDM for high-capacity optical transport network," J.
Lightw. Technol. 27, 3714-3720 (2009).

S. Chen, Q. Yang, Y. Ma, W. Shieh, "Real-time multi-gigabit receiver for coherent optical MIMO-OFDM
signals," J. Lightw. Technol. 27, 3699-3704 (2009).

N. Kaneda, Q. Yang;, X. Liu, S. Chandrasekhar, W. Shieh, Y. K. Chen, "Real-time
2.5 GS/s coherent optical receiver for 53.3-Gb/s sub-banded OFDM," J. Lightw. Technol. 28, 494-501 (2010).

J. M. Tang, P. M. Lane, K. A. Shore, "High-speed transmission of
adaptively modulated optical OFDM signals over multimode fibers using directly
modulated DFBs," J. Lightw. Technol. 24, 429-441 (2006).

X. Liu, S. Chandrasekhar, B. Zhu, P. Winzer, A. Gnauck, D. Peckham, "448-Gb/s reduced-guard-interval CO-OFDM
transmission over 2000 km of ultra-large-area fiber and five 80-GHz-Grid ROADMs," J. Lightw. Technol. 29, 483-490 (2010).

S. L. Jansen, I. Morita, T. C. W. Schenk, H. Tanaka, "121.9-Gb/s PDM-OFDM transmission
with 2-b/s/Hz spectral efficiency over 1000 km of SSMF," J. Lightw. Technol. 27, 177-188 (2009).

X. Yi, W. Shieh, Y. Ma, "Phase noise effects on high spectral efficiency coherent
optical OFDM transmission," J. Lightw. Technol. 26, 1309-1316 (2008).

E. IP, "Nonlinear compensation using
backpropagation for polarization-multiplexed transmission," J. Lightw. Technol. 28, 939-951 (2010).

J. Tang, "The channel capacity of a multispan
DWDM system employing dispersive nonlinear optical fibers and an ideal coherent
optical receiver," J. Lightw. Technol. 20, 1095-1101 (2002).

M. Mayrock, H. Haunstein, "Monitoring of linear and nonlinear
signal distortion in coherent optical OFDM transmission," J. Lightw. Technol. 27, 3560-3566 (2009).

X. Liu, F. Buchali, R. W. Tkach, "Improving the nonlinear tolerance
of polarization-division-multiplexed CO-OFDM in long-haul fiber transmission," J. Lightw. Technol. 27, 3632-3640 (2009).

Y. Tang, W. Shieh, "Coherent optical OFDM transmission up to
1 Tb/s per channel," J. Lightw. Technol. 27, 3511-3517 (2009).

S. C. J. Lee, F. Breyer, S. Randel, H. P. A. van den Boom, A. M. J. Koonen, "High-speed transmission over
multimode fiber using discrete multitone modulation [invited]," J. Opt. Netw. 7, 183-196 (2008).

X. Q. Jin, J. M. Tang, P. S. Spencer, K. A. Shore, "Optimization of adaptively
modulated optical OFDM modems for multimode fiber-based local area networks
[invited]," J. Opt. Netw. 7, 198-214 (2008).

P. P. Mitra, J. B. Stark, "Nonlinear limits to the information
capacity of optical fibre communications," Nauture 411, 1027-1030 (2001).

A. J. Lowery, S. Wang, M. Premaratne, "Calculation of power limit due to fiber
nonlinearity in optical OFDM systems," Opt.
Exp. 15, 13282-13287 (2007).

W. Shieh, Q. Yang, Y. Ma, "107 Gb/s coherent optical OFDM transmission over 1000-km
SSMF fiber using orthogonal band multiplexing," Opt.
Exp. 16, 6378-6386 (2008).

K. Lee, C. T. D. Thai, J. K. Rhee, "All optical discrete Fourier
transform processor for 100 Gbps OFDM transmission," Opt.
Exp. 16, 4023-4028 (2008).

Y. Benlachtar, G. Gavioli, V. Mikhailov, R. I. Killey, "Experimental investigation
of SPM in long-haul direct-detection OFDM systems," Opt.
Exp. 16, 15477-15482 (2008).

N. Gisin, B. Huttner, "Combined effects of polarization
mode dispersion and polarization dependent losses in optical fibers," Opt. Commun. 142, 119-125 (1997).

X. Liu, F. Buchali, "Intra-symbol frequency-domain
averaging based channel estimation for coherent optical OFDM," Opt. Exp. 16, 21944-21957 (2008).

M. Nazarathy, J. Khurgin, R. Weidenfeld, Y. Meiman, P. Cho, R. Noe, I. Shpantzer, V. Karagodsky, "Phased-array cancellation of nonlinear FWM in coherent OFDM
dispersive multi-span links," Opt. Exp. 16, 15777-15810 (2008).

W. Shieh, H. Bao, Y. Tang, "Coherent optical OFDM: Theory and design," Opt. Exp. 16, 841-859 (2008).

X. Chen, W. Shieh, "Closed-form expressions for nonlinear transmission
performance of densely spaced coherent optical OFDM systems," Opt. Exp. 18, 19039-19054 (2010).

A. J. Lowery, "Fiber nonlinearity pre- and
post-compensation for long-haul optical links using OFDM," Opt. Exp. 15, 12965-12970 (2007).

D. Hillerkuss, M. Winter, M. Teschke, A. Marculescu, J. Li, G. Sigurdsson, K. Worms, S. B. Ezra, N. Narkiss, W. Freude, J. Leuthold, "Simple all-optical FFT scheme enabling Tbit/s real-time
signal processing," Opt. Exp. 18, 9324-9340 (2010).

A. Lowery, J. Armstrong, "10 Gbit/s multimode fiber link
using power-efficient orthogonal-frequency-division multiplexing," Opt. Exp. 13, 10003-10009 (2005).

I. B. Djordjevic, B. Vasic, "Orthogonal frequency division multiplexing
for high-speed optical transmission," Opt. Exp. 14, 3767-3775 (2006).

H. Sun, K. Wu, K. Roberts, "Real-time measurements of a 40 Gb/s coherent
system," Opt. Exp. 16, 873-879 (2008).

Q. Yang, S. Chen, Y. Ma, W. Shieh, "Real-time reception of multi-gigabit coherent optical OFDM
signals," Opt. Exp. 17, 7985-7992 (2009).

X. Q. Jin, R. P. Giddings, E. Hugues-Salas, J. M. Tang, "Real-time demonstration of
128-QAM-encoded optical OFDM transmission with a 5.25 bit/s/Hz spectral efficiency
in simple IMDD systems utilizing directly modulated DFB lasers," Opt. Exp. 17, 20484-20493 (2009).

R. P. Giddings, X. Q. Jin, E. Hugues-Salas, E. Giacoumidis, J. L. Wei, J. M. Tang, "Experimental demonstration
of a record high 11.25 Gb/s real-time optical OFDM transceiver supporting
25 km SMF end-to-end transmission in simple IMDD systems," Opt. Exp. 18, 5541-5555 (2010).

W. Shieh, X. Yi, Y. Ma, Y. Tang, "Theoretical and experimental study on PMD-supported transmission
using polarization diversity in coherent optical OFDM systems," Opt. Exp. 15, 9936-9947 (2007).

S. L. Jansen, I. Morita, N. Takeda, H. Tanaka, "20-Gb/s OFDM transmission over
4 160-km SSMF enabled by RF-pilot tone phase noise compensation," Proc. Opt. Fiber Commun. Conf. (2007).

E. Yamada, A. Sano, H. Masuda, T. Kobayashi, E. Yoshida, Y. Miyamoto, Y. Hibino, K. Ishihara, Y. Takatori, K. Okada, K. Hagimoto, T. Yamada, H. Yamazaki, "Novel no-guardinterval PDM CO-OFDM transmission in 4.1 Tb/s
(50 88.8-Gb/s) DWDM link over 800 km SMF including 50-GHz spaced ROADM nodes," Proc. Opt. Fiber Commun. Conf. (2008).

D. Qian, T. Kwok, N. Cvijetic, J. Hu, T. Wang, "41.25 Gb/s real-time OFDM receiver for variable rate WDM-OFDMA-PON
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F. Buchali, R. Dischler, A. Klekamp, M. Bernhard, D. Efinger, "Realisation of a real-time
12.1 Gb/s optical OFDM transmitter and its application in a 109 Gb/s transmission
system with coherent reception," Proc. ECOC (2009).

N. E. Jolley, H. Kee, R. Rickard, J. M. Tang, K. Cordina, "Generation and propagation of a 1550 nm
10 Gb/s optical orthogonal frequency division multiplexed signal over 1000
m of multimode fibre using a directly modulated DFB," Proc.
OFC (2005).

Y. Ma, Q. Yang, Y. Tang, S. Chen, W. Shieh, "1-Tb/s per channel coherent
optical OFDM transmission with subwavelength bandwidth access," Proc. OFC (2009).

R. Dischler, F. Buchali, "Transmission of 1.2 Tb/s continuous
waveband PDM-OFDM-FDM signal with spectral efficiency of 3.3 bit/s/Hz over
400 km of SSMF," Proc. OFC (2009).

S. Chandrasekhar, X. Liu, B. Zhu, D. W. Peckham, "Transmission of a 1.2-Tb/s 24-carrier no-guard-interval
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