Adaptive Loading Algorithms for IMDD Optical OFDM PON Systems Using Directly Modulated Lasers

Giacoumidis, Elias; Kavatzikidis, A.; Tsokanos, Athanasios; Tang, J. M.; Tomkos, Ioannis

doi:10.1364/jocn.4.000769

Cited by 47 publications

(17 citation statements)

References 12 publications

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“…It is seen that fiber nonlinear effect is negligible for 10-dBm launch power (as used in Figs. [4][5][6] and becomes prominent when the power increases beyond 12 dBm. Estimation of the SNR profile for each power increases the complexity but significantly improves the performance.…”

Section: Resultsmentioning

confidence: 99%

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Adaptively loaded IM/DD optical OFDM based on set-partitioned QAM formats

Zhao¹,

Chen

2017

Opt. Express

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Type of publicationArticle (peer-reviewed) Abstract:We investigate the constellation design and symbol error rate (SER) of setpartitioned (SP) quadrature amplitude modulation (QAM) formats. Based on the SER analysis, we derive the adaptive bit and power loading algorithm for SP QAM based intensity-modulation direct-detection (IM/DD) orthogonal frequency division multiplexing (OFDM). We experimentally show that the proposed system significantly outperforms the conventional adaptively-loaded IM/DD OFDM and can increase the data rate from 36 Gbit/s to 42 Gbit/s in the presence of severe dispersion-induced spectral nulls after 40-km singlemode fiber. It is also shown that the adaptive algorithm greatly enhances the tolerance to fiber nonlinearity and allows for more power budget.

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Section: Resultsmentioning

confidence: 99%

“…technology in IM/DD OFDM [3][4][5][6][7]. By allocating different bits to each individual subcarrier according to the signal to noise ratio (SNR), this technology maximizes the system capacity and increases the flexibility via fine spectral efficiency (SE) granularities.…”

mentioning

confidence: 99%

Adaptively loaded IM/DD optical OFDM based on set-partitioned QAM formats

Zhao¹,

Chen

2017

Opt. Express

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“…Next, the electrical transmitting power of all subcarriers is compared between IHHA and a traditional power loading algorithm [19]. In this traditional power loading algorithm, all subcarriers have the same modulation format to meet the data rate demand and different power levels to guarantee the BER requirement.…”

Section: Simulation Results and Analysismentioning

confidence: 99%

“…The previous works achieved power savings for OFDM-PONs from the perspective of MAC-layer or hardware-level optimization, but they neglected designing appropriative algorithms, and the long-reach transmission performance cannot be guaranteed [13][14][15][16]. Though the adaptive modulation can improve the transmission performance of IM/DD OFDM-PONs by adjusting the bit/power allocation for each subcarrier [17][18][19][20], most of existing schemes focused on optimizing the transmission rate not power consumption. Furthermore, our preliminary work has shown that the power consumption of OFDM-PONs can be minimized by using the novel bit and power loading algorithm [16].…”

Section: Introductionmentioning

confidence: 99%

Power-efficient schemes using directly modulated lasers for intensity modulation and direct detection OFDM-PONs

2015

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The intensity modulation and direct detection (IM/DD) passive optical network (PON) has been demonstrated as a cost-effective solution for a long-reach (> 80 km) access system because it can be easily installed and maintained with low cost and complexity. Meanwhile, orthogonal frequency division multiplexing (OFDM) has been widely used in PONs due to its high spectral efficiency and strong resistance to dispersion impairments. So, the IM/DD OFDM-PON emerged. The power efficiency has attracted great research interests in IM/DD OFDM-PONs. The previous works achieved power savings from the perspective of MAClayer or hardware-level optimization, but they neglected designing appropriative algorithms, and the long-reach transmission performance cannot be guaranteed. In this paper, we propose an improved Hughes-Hartogs algorithm (IHHA) to adjust the number of bits and power level allocated for each subcarrier, with the objective to minimize the electrical transmitting power of all subcarriers. The OFDM signal is generated according to the bit/power allocation result of IHHA, and we conduct extensive simulations to verify the long-reach transmission performance of our system. Simulation results show that our system has high power efficiency by using IHHA, and bit error rate satisfies the forward error correction limitation after 100 km single-mode fiber transmission.

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“…Proposed solutions include Orthogonal Frequency-Division Multiplexing (OFDM), in where spatial and frequency bit allocation schemes can be implemented, adding a new layer of reconfigurability [1]. Carrierless Amplitude Phase (CAP) [2] provides high spectral efficiency with simplified transmitter and receivers based on electrical passband filters.…”

Section: Introductionmentioning

confidence: 99%