10-Gb/s transmission over 20-km single fiber link using 1-GHz RSOA by discrete multitone with multiple access

Abstract

We demonstrate a novel 10.5-Gbit/s transmission scheme over 20-km single fiber link by using a remotely fed 1-GHz reflective semiconductor optical amplifier (RSOA). Discrete multitone (DMT) modulation with adaptive bit-/power-loading is applied to overcome the bandwidth limitation of the RSOA. Transmission performance of the proposed scheme is analyzed in terms of various system parameters, such as the nonlinearity of the RSOA, optical signal-to-noise ratio of the optical seed carrier, the overhead size impact on dispersion, the number of DMT subcarriers, and the reflection noise from the single fiber link. We also report flexible-bandwidth-allocated multiple access operation based on the proposed scheme. The throughput for all cases is approximately 10 Gbit/s with BER < 10(-3).

Inter-band interference suppression in multi-band OFDM-PON uplink transmission using window shaping

“…Also intensity modulation with direct detection (IM/DD) based OFDM transmission provides system simplicity and cost effectiveness [4,5].…”

“…However, time synchronization is essentially required among multiple access signals to maintain the OFDM orthogonality in the OFDMA-PON system [1,2,4]. In practical, multiple access signals are generated at different time in each optical network unit (ONU), and the fiber lengths from optical line terminal (OLT) to each ONU are also different.…”

RSOA Intensity Modulator Frequency Chirp-Enhanced Optical OFDM PON Performance

“…Since reflective semiconductor optical amplifier-based intensity modulators (RSOA-IMs) have a large number of salient advantages including colorlessness, cost-effectiveness, compactness, low power dissipation, large-scale monolithic integration capability, as well as highly desirable functionalities of simultaneous signal modulation and amplification [1]- [4], RSOA-IMs are widely considered as cost-effective intensity modulator candidates for cost-sensitive application scenarios such as optical network units (ONUs) in next-generation passive optical networks (PONs) [5]- [7]. Commercially available, low-cost RSOAs have, however, very limited 3-dB small-signal modulation bandwidths, and the RSOA-IMs also suffer from the intensity modulation-induced strong frequency chirp effect [8]- [10], which may cause deep system frequency response nulls to occur over the useful signal spectral regions in representative standard single-mode fiber (SSMF) PON systems based on intensity-modulation and direct-detection (IMDD) [10].…”

Throughput enhancement of slow adaptive orthogonal frequency division multiple access based passive optical network uplink transmission in 20‐km single fibre loopback link employing channel stabilisation

“…However, this condition dramatically varies because of the Rayleigh backscattering (RB) effect which is a common network topology in optical access which transmits up/down stream through a single fibre loopback link, especially in uplink transmission [10][11][12][13][14][15][16][17]. Consequently, the OFDMA-PON transmitters should estimate their CSI frequently with respect to catch up with fast-changing channel responses [18] and as a result it generates too much redundancy.…”