Cost effective OLT designed from optical frequency comb generator based EML for1.22 Tbps wavelength division multiplexed passive optical network

Ullah, Rahat; Liu, Bo; Ullah, Sibghat; Mao, Yaya; Tian, Feng; Xin, Xiangjun

doi:10.1016/j.yofte.2018.01.025

Cited by 16 publications

(11 citation statements)

References 42 publications

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“…Wavelength Division Multiplexing (WDM) is a promising technology in which the huge bandwidth of an optical fiber is divided in to many non-overlapping high speed channels, each one is called a wavelength (w) channel. [1][2][3][4][5] The emerging technologies in the field of optical communications include optical frequency comb generation, [6][7][8] network security, 9,10 advance modulation techniques, 11 and advance iterative modeling for good quality of service (QoS). [12][13][14][15][16] In optical networking, a connection request arriving to a network from the source node s to the destination node d is called a lightpath.…”

Section: Introductionmentioning

confidence: 99%

An advanced iterative model for computing approximated blocking probabilities and measuring the quality of service in optical communication networks

Khan

Ali

Imtiaz

et al. 2021

Micro & Optical Tech Letters

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Existing analytical models (EAMs) are used to find the quality of service of optical networks with wavelength division multiplexing (WDM). However, the convergence of EAMs decreases with an increase in traffic load and the numbers of wavelength (w) channels. EAMs are used to compute approximated numerical values of blocking probabilities (BPs) which are based on an iterative approach. There are cases in EAMs when numerical BP values do not converge to a single point after numerous iterations. In this paper, the converge issues of EAMs have been addressed by considering a recursive approximation based on iterative approach with the convergence criteria which is called an advance approximated BP model (AABPM). The accuracy of the AABPM for WDM optical networks is examined by comparing with an EAM as well as simulation results which shows that AABPM converges to give similar approximated numerical values with less convergence time.

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Section: Introductionmentioning

confidence: 99%

An advanced iterative model for computing approximated blocking probabilities and measuring the quality of service in optical communication networks

Khan

Ali

Imtiaz

et al. 2021

Micro & Optical Tech Letters

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“…Optical frequency comb (OFC) generation have attracted many researchers due to its diverse characteristics of transmitting higher data rates at lower cost. It has been widely used as a multi wavelength source at the OLT side of an optical communication system in optical orthogonal frequency division multiplexing, optical time division multiplexing, quadrature amplitude modulation, and dense wavelength division multiplexing [1]- [8]. It has been a hotspot for researchers due to its importance and applications in the area of optical…”

Section: Introductionmentioning

confidence: 99%

“…Generation of OFC using optical modulation is another interesting technique and has already been widely studied. This technique can be explained in two parts: (i) the first one is based on the utilization of either intensity modulators (IMs) [19], [20], cascaded or parallel IMs [1], [21]- [23], phase modulators (PMs) [24]- [26], or polarization modulators [27]. (ii) the second one is based on the hybrid utilization of different modulators such as cascaded configuration of PM and IMs [28].…”

Section: Introductionmentioning

confidence: 99%

Ultra-Wide and Flattened Optical Frequency Comb Generation Based on Cascaded Phase Modulator and LiNbO3-MZM Offering Terahertz Bandwidth

Ullah

Zhang

et al. 2020

IEEE Access

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In this paper, a new technique for generation of ultra-wide and flattened optical frequency comb (OFC) based on serial cascading of a phase modulator and dual-driven Lithium-Niobate Mach Zehnder modulator (DD-LiNbO 3-MZM) is proposed. Over 60 carriers were generated by carefully adjusting the RF switching voltage (RFSV) of the DD-LiNbO 3-MZM and the signal frequency of the sinusoidal wave (RF) source. A low power amplified RF source with a signal driving power of 16.9dBm is applied, and the power of CW laser is kept at 3dBm. The frequency spacing (FS) is kept at 20GHz for generating the maximum number of carriers. Nonetheless, the scheme is also tested for the FSs of 64GHz, and 32GHz. Each scenario is examined in simulation environment and the main outcomes are highlighted. The proposed scheme is comparatively simple and the FS varies with the applied RF source on the modulators. The achieved OFC lines have a tone-to-noise ratio (TNR) of over 45dB with an undesired side mode suppression ratio of approximately 20dB. The comb lines are almost flat with a varying power deviation of around 0dB-6dB which is optimized to nearly 0.12dB. Furthermore, the impact of the RFSV on the generated number of carriers is studied in detail. The scheme is analyzed in terms of cost efficiency, power deviations, TNR, optical signal to noise ratio, and number of achieved comb lines.

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“…Above all, the sensitivity of the direct detection-based receiver side is limited, so it is not adequate for long-reach transmission or high-order modulation-based systems. To overcome the low receiver sensitivity, several wavelength resources-based transmission techniques have been proposed to remarkably expand the total data-rate [4], [5]. However, these wavelength division multiplexing techniques can give us the burden of both system complexity and stabilization.…”

Section: Introductionmentioning

confidence: 99%

Multiple Access Noise Compensation in CO-OFDMA-PON Uplink Transmission Using Digital Phase Conjugated-Pilot Tones

2020

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In coherent orthogonal frequency division multiple accessing technique-based passive optical network (CO-OFDMA-PON) uplink transmission, two main multiple-access noises (MNs), which are multiple-state-of-polarization leakages (SOPLs) and phase noises (PNs) inevitably occur by various optical network units (ONUs) and interfere with the uplink signal in this system. These MNs are different by optical devices and paths of each ONU. In this regard, parallel MNs handling per ONU is necessary to provide uplink service. We propose digital phase conjugated pilot-tones (DPC-PTs) based MNs compensation technique. This can deal with MNs by using superposition of two adjacent pilot subcarriers. In the experiments conducted, we applied a pair of DPC-PTs per ONU to handle two MNs and performed parallel processing for each ONU. The transmission performance in terms of root-mean-square error, error-vector magnitude, bit-error-rate (BER), and the overhead of redundant PTs was improved by using the proposed technique in 20-km CO-OFDMA-PON uplink transmission. Both MNs were effectively compensated by comparing transmitted and received DPC-PTs. Minimum overhead of 0.39 % OFDMA symbol duration was verified to meet BER target in the given transmission condition. It guarantees more accurate tracking of SOPL than single-PT-based one due to the doubled number of estimator samples. Besides, more accurate tracking of PNs is demonstrated due to lower noise level between DPC-PTs. As a result, applicability to the phase and polarization diversities-based coherent multiple access is demonstrated through the proposed MNs tracking technique. INDEX TERMS Coherent optical communications, phase noise, polarization, multiple access, passive optical network.

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Cost effective OLT designed from optical frequency comb generator based EML for1.22 Tbps wavelength division multiplexed passive optical network

Cited by 16 publications

References 42 publications

An advanced iterative model for computing approximated blocking probabilities and measuring the quality of service in optical communication networks

An advanced iterative model for computing approximated blocking probabilities and measuring the quality of service in optical communication networks

Ultra-Wide and Flattened Optical Frequency Comb Generation Based on Cascaded Phase Modulator and LiNbO3-MZM Offering Terahertz Bandwidth

Multiple Access Noise Compensation in CO-OFDMA-PON Uplink Transmission Using Digital Phase Conjugated-Pilot Tones

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Cost effective OLT designed from optical frequency comb generator based EML for1.22 Tbps wavelength division multiplexed passive optical network

Cited by 16 publications

References 42 publications

An advanced iterative model for computing approximated blocking probabilities and measuring the quality of service in optical communication networks

An advanced iterative model for computing approximated blocking probabilities and measuring the quality of service in optical communication networks

Ultra-Wide and Flattened Optical Frequency Comb Generation Based on Cascaded Phase Modulator and LiNbO3-MZM Offering Terahertz Bandwidth

Multiple Access Noise Compensation in CO-OFDMA-PON Uplink Transmission Using Digital Phase Conjugated-Pilot Tones

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Cost effective OLT designed from optical frequency comb generator based EML for1.22 Tbps wavelength division multiplexed passive optical network