100 Gb/s Intensity Modulation and Direct Detection

Cartledge, J.C.; Karar, Abdullah S.

doi:10.1109/jlt.2014.2314611

Cited by 92 publications

(32 citation statements)

References 24 publications

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“…Subcarrier modulation (SCM) signal formats, in particular orthogonal frequency division multiplexing (OFDM) [5] and Nyquist-pulse shaped subcarrier modulation (Nyquist-SCM) [6][7][8], can be utilized to achieve high ISDs for DD systems. However, their performance is severely degraded because of a nonlinear effect introduced by the square-law detection, referred to as signal-signal beat interference (SSBI).…”

Section: Introductionmentioning

confidence: 99%

Comparison of digital signal-signal beat interference compensation techniques in direct-detection subcarrier modulation systems

Erkılınç

Galdino

et al. 2016

Opt. Express

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Single-polarization direct-detection transceivers may offer advantages compared to digital coherent technology for some metro, back-haul, access and inter-data center applications since they offer low-cost and complexity solutions. However, a direct-detection receiver introduces nonlinearity upon photodetection, since it is a square-law device, which results in signal distortion due to signal-signal beat interference (SSBI). Consequently, it is desirable to develop effective and low-cost SSBI compensation techniques to improve the performance of such transceivers. In this paper, we compare the performance of a number of recently proposed digital signal processing-based SSBI compensation schemes, including the use of single-and two-stage linearization filters, an iterative linearization filter and a SSBI estimation and cancellation technique. Their performance is assessed experimentally using a 7×25 Gb/s wavelength division multiplexed (WDM) single-sideband 16-QAM Nyquist-subcarrier modulation system operating at a net information spectral density of 2.3 (b/s)/Hz.

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Section: Introductionmentioning

confidence: 99%

Comparison of digital signal-signal beat interference compensation techniques in direct-detection subcarrier modulation systems

Erkılınç

Galdino

et al. 2016

Opt. Express

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“…To achieve high-capacity DM-DD transmission, various modulation formats have been proposed, including multi-level Pulse Amplitude Modulation (PAM) [8,11], half-cycle Quadrature Amplitude Modulation (QAM) [12], and Discrete Multi-Tone (DMT) [3][4][5][6][7]. In particular, the DMT modulation format is considered a promising technique because it offers high spectral efficiency and the capability to adapt to component imperfections (e.g., high-frequency modulation roll-off) and transmission impairments.…”

Section: Introductionmentioning

confidence: 99%

Discrete Multitone Format for Repeater-Less Direct-Modulation Direct-Detection Over 150 km

Liu

Kelly

O’Carroll

et al. 2016

J. Lightwave Technol.

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-High-capacity and low-cost repeater-less transmission beyond 50 km is of interest for the next-generation inter-data center communications. Transmission over such relatively long distance generally requires transmission in the 1550-nm low-loss telecom band that is, however, impaired by chromatic dispersion. Here, we study the performance of the direct modulation direct detection (DM-DD) system using the discrete multi-tone (DMT) format for repeater-less transmission through up to 150 km of a standard single mode fiber (SMF-28) using the 1550-nm band. The achievable capacity for two different types of directly modulated lasers is studied experimentally and compared with that achievable using chirp-free modulation using a push-pull LiNbO3 Mach-Zehnder external modulator (MZM). The benefit of using a larger bandwidth signal is found to diminish as the transmission distance increases. 28 and 25 Gbit/s signal transmission (Bit Error Ratio, BER < 3.8×10 -3 ) over 50 km and 75 km are achieved using just 8-GHz modulation-bandwidth.

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“…H IGH capacity short-reach optical communication systems are extensively studied to accommodate bit rate requirements for data centers [1], [2]. Implementation of optical systems with high capacity targets can be demanding in a cost-sensitive scenario.…”

Section: Introductionmentioning

confidence: 99%

“…In section II, we discuss the noise sources in short-reach DSB direct-detection DMT 2 and identify two channel noise models. In section III, we describe the methodology for finding symbol positions and a bit-to-symbol mapping in the two non-square M-QAM constellation sets, one for each channel model.…”

Section: Introductionmentioning

confidence: 99%

Discrete Multi-Tone Transmission With Optimized QAM Constellations for Short-Reach Optical Communications

Amiralizadeh

Yekani

Rusch

2016

J. Lightwave Technol.

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Abstract-We investigate performance of optimized M-ary quadrature amplitude modulation (M-QAM) constellations in short-reach single-polarization (SP) and dual-polarization (DP) discrete multi-tone (DMT) with direct detection. The constellations are obtained by using an iterative gradient-search algorithm. For the non-square constellations, we find bit-to-symbol mappings with a blind search method. Our experiments show that data rate can be improved in both SP and DP DMT systems by using optimized constellations instead of square M-QAM. Net data transmission rates of 165 Gb/s and 152 Gb/s are respectively achieved for back-to-back and 2.2 km in a direct-detection DP DMT system assuming forward error correction (FEC) threshold of 3.8 × 10 −3 .

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100 Gb/s Intensity Modulation and Direct Detection

Cited by 92 publications

References 24 publications

Comparison of digital signal-signal beat interference compensation techniques in direct-detection subcarrier modulation systems

Comparison of digital signal-signal beat interference compensation techniques in direct-detection subcarrier modulation systems

Discrete Multitone Format for Repeater-Less Direct-Modulation Direct-Detection Over 150 km

Discrete Multi-Tone Transmission With Optimized QAM Constellations for Short-Reach Optical Communications

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