1.92 Tbit/s, 64 QAM Coherent Nyquist Pulse Transmission over 150 km with a Spectral Efficiency of 7.5 bit/s/Hz

Otuya, David O.; Kasai, Keisuke; Hirooka, Toshihiko; Yoshida, Masato

doi:10.1364/ofc.2014.w1a.4

Cited by 4 publications

(4 citation statements)

References 7 publications

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“…This scheme is scalable to a higher symbol rate per channel of for example 1 Tbaud, 10) and simultaneously enables ultrahigh SE by employing coherent QAM. 11) 3. Second "M": Multi-core optical fiber for SDM One of the strongest motivations for developing new fiber technologies is the huge increase in optical power.…”

Section: First "M": Multi-level Coherent Transmission With An Ultrahi...mentioning

confidence: 99%

Exabit optical communication explored using 3M scheme

Nakazawa

2014

Jpn. J. Appl. Phys.

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The capacity of the optical communication infrastructure in backbone networks has increased 1000-fold over the last 20 years. Despite this rapid progress, internet traffic is continuing to grow at an annual rate of 40%. This means that in 20 years, we will need petabit/s or even exabit/s optical communication. In this paper, we present recent challenges and efforts toward achieving a hardware paradigm shift to overcome the capacity limitation imposed by the current optical communication infrastructure. We will overview the latest advances on the three “multi” technologies, i.e., multi-level transmission with ultrahigh spectral efficiency, space division multiplexing in multi-core fibers, and mode division multiplexing with multiple-input multiple-output (MIMO).

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Section: First "M": Multi-level Coherent Transmission With An Ultrahi...mentioning

confidence: 99%

Exabit optical communication explored using 3M scheme

Nakazawa

2014

Jpn. J. Appl. Phys.

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“…Since the raised cosine waveform causes interference between neighboring tributaries, CR for Nyquist OTDM is hardly possible even by the state-of-the-art ultrafast CR techniques. This issue, however, has not been addressed in the transmission demonstrations [5,6,12,13]. We have carried out a stable CR scheme for Nyquist OTDMs with baudrate up to 344 Gbaud [9] by using the optical null-header insertion [14].…”

Section: Transmission and Add-drop Operationsmentioning

confidence: 99%

“…Coherent Nyquist OTDM-QAM transmission has also been shown to achieve a higher spectral efficiency [6]. In addition, the use of Nyquist pulse to OTDM signals potentially further improves the spectral efficiency by eliminating guard-bands which are indispensable in conventional wavelength division multiplexing (WDM) approaches.…”

Section: Introductionmentioning

confidence: 99%

All-optical Nyquist Filtering for elastic OTDM signals and their spectral defragmentation through parametric processes

Tan

Inoue

Tanizawa

et al. 2014

2014 IEEE Photonics Society Summer Topical Meeting Series

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“…[1][2][3] Coherent optical receivers are required to recover the phase information included in such modulation schemes. [4][5][6] Instead of using dispersion compensation fiber or optical phase conjugation for fiber dispersion compensation, digital optical coherent receivers with digital channel equalizer have become the dominating choice due to its high flexibility and low cost.…”

Section: Introductionmentioning

confidence: 99%

Studies on effects of feedback delay on the convergence performance of adaptive time-domain equalizers for fiber dispersive channels

Guo

Qiu

2016

Opt. Eng

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Abstract. Adaptive time-domain equalizer (TDE) is an important module for digital optical coherent receivers. From an implementation perspective, we analyze and compare in detail the effects of error signal feedback delay on the convergence performance of TDE using either least-mean square (LMS) or constant modulus algorithm (CMA). For this purpose, a simplified theoretical model is proposed based on which iterative equations on the mean value and the variance of the tap coefficient are derived with or without error signal feedback delay for both LMS-and CMA-based methods for the first time. The analytical results show that decreased step size has to be used for TDE to converge and a slower convergence speed cannot be avoided as the feedback delay increases. Compared with the data-aided LMS-based method, the CMA-based method has a slower convergence speed and larger variation after convergence. Similar results are confirmed using numerical simulations for fiber dispersive channels. As the step size increases, a feedback delay of 20 clock cycles might cause the TDE to diverge. Compared with the CMA-based method, the LMS-based method has a higher tolerance on the feedback delay and allows a larger step size for a faster convergence speed.

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1.92 Tbit/s, 64 QAM Coherent Nyquist Pulse Transmission over 150 km with a Spectral Efficiency of 7.5 bit/s/Hz

Cited by 4 publications

References 7 publications

Exabit optical communication explored using 3M scheme

Exabit optical communication explored using 3M scheme

All-optical Nyquist Filtering for elastic OTDM signals and their spectral defragmentation through parametric processes

Studies on effects of feedback delay on the convergence performance of adaptive time-domain equalizers for fiber dispersive channels

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