A 40-Gbps OFDM LR-PON System over 100-km Fiber Employing an Economical 10-GHz-based Transceiver

Hsu, Dar-Zu; Wei, Chia-Chien; Chen, Hsing-Yu; Lu, Yicheng; Chen, Jyehong

doi:10.1364/ofc.2012.ow4b.2

Cited by 14 publications

(7 citation statements)

References 8 publications

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“…Nevertheless, the line rate of VCSELs cannot support for the high speed SR-ON transmission. An EML is an electroabsorption modulator (EAM) monolithically integrated with a distributed feedback (DFB) laser, which are demonstrated in many potential applications in SR-ONs [13]. Compared with conventional LiNbO 3 Mach-Zehnder modulators (MZMs), the integrated optical modulators have a lot of advantages, such as low driven voltage, low energy consumption, cost-efficiency and compact sizes.…”

Section: Introductionsmentioning

confidence: 99%

Advanced modulation formats for 400-Gbps short-reach optical inter-connection

et al. 2015

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Besides the long-haul optical networks covering over thousands of kilometers for backbone transmission, short reach optical networks (SR-ONs) are widely deployed in metro-area for aggregation and accessing. The SR-ONs include the metro optical transport networks (Metro-OTN), optical access networks or other optical inter-connection systems with even shorter distance. As predicted, the growing bandwidth demanding from SR-ONs will be much more than that from the long-haul optical networks in the near future. Besides, there are tremendous amounts of optical terminals and end-users in SR-ONs compared with the long-haul transmission systems and thus will induce large cost and huge energy consumption. So, the power and cost efficiency should be the key consideration for SR-ONs besides the transmission performance. To improve the power and cost efficiency in SR-ONs, advanced modulations and detection techniques based on low power, low cost and integrated optical modulators should be utilized. In this paper, different advanced modulation formats have been discussed. 56Gbps PAM4, 112Gbps poly-binary and 100Gbps DMT that can be used to realize 400-Gbps SR-ONs for different applications have also been demonstrated respectively. In addition, low-cost and low-power opto-electronic components suitable for SR-ONs, the impairments induced by all kinds of defects and bandwidth limitation of opto-electronic components and the corresponding compensation techniques based on DSP algorithms have also been discussed in the experiments.

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Section: Introductionsmentioning

confidence: 99%

Advanced modulation formats for 400-Gbps short-reach optical inter-connection

et al. 2015

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“…However, optical OFDM signals employing DMLs or EMLs will be optical double-side band (DSB) and frequency-chirped, resulting in detrimental dispersion-and chirp-related power fading. Since the power fading is periodic, a dynamic multi-band optical OFDM scheme [7][8][9] is proposed to solve the problem. In this scheme, the OFDM subcarriers can be dynamically allocated with adaptive modulation formats to the secondary passbands to make the best of bandwidth utilization.…”

Section: Introductionmentioning

confidence: 99%

“…In this scheme, the OFDM subcarriers can be dynamically allocated with adaptive modulation formats to the secondary passbands to make the best of bandwidth utilization. For example, the experimental results in [7,8] show that available bandwidth of 100-km standard single-mode fiber (SSMF) transmission can be increased from 3 GHz to 6 GHz after allocating OFDM subcarriers in the secondary passbands. Thus, power fading is no longer the major bottleneck of dispersion uncompensated IMDD networks.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, power fading is no longer the major bottleneck of dispersion uncompensated IMDD networks. Nevertheless, in addition to power fading, optical IMDD transmission will suffer from dispersion-and chirp-related subcarrier-to-subcarrier intermixing interference (SSII), which has been theoretically and experimentally investigated in [7,8,10]. The investigated results show that most of SSII is overlapped with the OFDM subcarriers located in the secondary passbands to degrade the signal-to-noise ratio (SNR) of the subcarriers.…”

Section: Introductionmentioning

confidence: 99%

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SSII cancellation in an EAM-based OFDM-IMDD transmission system employing a novel dynamic chirp model

Hsu¹,

Wei²,

Chen³

et al. 2013

Opt. Express

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We develop a novel subcarrier-to-subcarrier intermixing interference (SSII) cancellation technique to estimate and eliminate SSII. For the first time, the SSII cancellation technique is experimentally demonstrated in an electro-absorption modulator- (EAM-) based intensity-modulation-direct-detection (IMDD) multi-band OFDM transmission system. Since the characteristics of SSII are seriously affected by the chirp parameter, a simple constant chirp model, we found, cannot effectively remove the SSII. Therefore, assuming that the chirp parameter linearly depends on the optical power, a novel dynamic chirp model is developed to obtain better estimation and cancellation of SSII. Compared with 23.6% SSII cancellation by the constant chirp model, our experimental results show that incorporating the dynamic chirp model into the SSII cancellation technique can achieve up to 74.4% SSII cancellation and 2.8-dB sensitivity improvement in a 32.25-Gbps OFDM system over 100-km uncompensated standard single-mode fiber.

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“…This chirp-induced dispersion introduces power fading as well as sub-carrier interaction [3,5], leading to SNR degradation on certain sub-carrier frequencies. Therefore, the degraded SNR is insufficient for using high modulation orders, considering that the available SNR at the optical receivers varies throughout a PON tree.…”

Section: Introductionmentioning

confidence: 99%

SNR Optimization through Digital Frequency-Domain Pre-Emphasis for Extending Transmission Distances in DML-Based OFDM-PON Systems

Kim

Tanida

Yoshimoto

2013

Optical Fiber Communication Conference/National Fiber Optic Engineers Conference 2013

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By optimizing the SNR of OFDM-PON systems through frequency-domain preemphasis to counter the transmission distortion caused by frequency-chirped lasers, we demonstrate 20-Gb/s fixed-16QAM transmission over 40 km with a 20-dB power-budget for a 5.2-GHz signal-bandwidth. OCIS codes: (060.2360) Fiber optics links and subsystems; (060.4080) Modulation IntroductionOrthogonal frequency division multiplexing (OFDM) technology has been widely researched and is one of the more promising approaches to future optical access systems. The higher modulation orders enable bit-rate enhancement through the efficient use of analog front-end bandwidth in optical transceivers. In addition, multi-carrier modulation provides fully flexible services due to its dedicated and shared access modes. These benefits can also be realized in the broadband mobile backhaul, by connecting many radio base stations to aggregation nodes [1]. Using direct modulation and detection, which yields simple optical transceivers, is the most attractive approach for the costeffective implementation of OFDM passive optical networks (PONs) [2,3].In order to increase the reach and the number of splits in PON tree architectures, optical transceivers are being designed to meet the high signal-to-noise ratio (SNR) requirements, to maximize the available optical power budget. As analog electronic and optoelectronic components are further researched and improved, better results continue to be achieved with PON transceivers including low-noise transimpedance amplifiers (TIAs) and high-sensitivity avalanche photodiodes (APDs) [4].However, due to the frequency chirp created by directly modulated laser (DML), OFDM signals suffer waveform distortion in the fiber link, which is influenced by the chirp amount and sign as well as characteristics of the fiber. This chirp-induced dispersion introduces power fading as well as sub-carrier interaction [3,5], leading to SNR degradation on certain sub-carrier frequencies. Therefore, the degraded SNR is insufficient for using high modulation orders, considering that the available SNR at the optical receivers varies throughout a PON tree. This limits the transmission distance as well as the available signal bandwidth of OFDM-PON systems. In this paper, we overcome these limitations through the SNR optimization in a PON system with the frequency-domain pre-emphasis and the OFDM formats of being able to control the power and modulation order for each sub-carrier.

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A 40-Gbps OFDM LR-PON System over 100-km Fiber Employing an Economical 10-GHz-based Transceiver

Abstract: We experimentally demonstrate a superior performance of at least 40-Gbps OFDMsignal transmission over 20~100-km long-reach PONs, which is achieved by using a 10-GHz EAM and direct detection, and adopting the bit-loading algorithm.

Cited by 14 publications

References 8 publications

Advanced modulation formats for 400-Gbps short-reach optical inter-connection

Advanced modulation formats for 400-Gbps short-reach optical inter-connection

SSII cancellation in an EAM-based OFDM-IMDD transmission system employing a novel dynamic chirp model

SNR Optimization through Digital Frequency-Domain Pre-Emphasis for Extending Transmission Distances in DML-Based OFDM-PON Systems

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