REAM intensity modulator-enabled 10Gb/s colorless upstream transmission of real-time optical OFDM signals in a single-fiber-based bidirectional PON architecture

Abstract

Abstract:Reflective electro-absorption modulation-intensity modulators (REAM-IMs) are utilized, for the first time, to experimentally demonstrate colorless ONUs in single-fiber-based, bidirectional, intensity-modulation and direct-detection (IMDD), optical OFDM PONs (OOFDM-PONs) incorporating 25km SSMFs and OLT-side-seeded CW optical signals. The colorlessness of the REAM-IMs is characterized, based on which optimum REAM-IM operating conditions are identified. In the aforementioned PON architecture, 10Gb/s colorless upstream transmissions of end-to-end realtime OOFDM signals are successfully achieved for various wavelengths within the entire C-band. Over such a wavelength window, corresponding minimum received optical powers at the FEC limit vary in a range as small as <0.5dB. In addition, experimental measurements also indicate that Rayleigh backscattering imposes a 2.8dB optical power penalty on the 10Gb/s over 25km upstream OOFDM signal transmission. Furthermore, making use of on-line adaptive bit and power loading, a linear trade-off between aggregated signal line rate and optical power budget is observed, which shows that, for the present PON system, a 10% reduction in signal line rate can improve the optical power budget by 2.6dB.

Adaptability-Enabled Record-High and Robust Capacity-Versus-Reach Performance of Real-Time Dual-Band Optical OFDM Signals Over Various OM1/OM2 MMF Systems [Invited]

“…As seen in Table II, for some cases the aggregated signal transmission capacities achieved in long MMF transmission systems are slightly higher than those achieved in shorter transmission systems employing the same type of MMFs. This is mainly due to the transceiver adaptability-induced trade-off between signal transmission capacity and corresponding ROP [17], since all these "unusual" high signal transmission capacity cases correspond to relatively large ROPs, as shown in Table II. …”

Upstream WDM-PON transmission scheme based on PDM-OOK modulation and digital coherent detection with dual-modulus algorithm

“…On the other hand, deploying expenditure is always a critical concern in PON scenario. In upstream WDM-PON transmission, if complex modulation scheme such as orthogonal frequency-division-multiplexing (OFDM) is used [4,5], the overall cost of optical network units (ONUs) would be a great challenge due to the requirement of high-speed digital circuits and high-linearity electronic and/or optical devices. Alternative upstream schemes may rely on cost-effective and mature on-off keying (OOK) transceiving modules, in which the transmission impairments induced by chromatic dispersion (CD) pose a large limitation on achievable data rate and reach [6].…”

Colorless FDMA-PON With Flexible Bandwidth Allocation and Colorless, Low-Speed ONUs [Invited]

“…This approach reduces computational effort for the ONU digital hardware, and it allows the capacity per user to be upgraded by exchanging the respective OLT and ONU transceivers. However, the minimum optical bandwidth allotted to each user at a reasonable price cannot be smaller than approximately 25 GHz. This limits the opportunities for CO consolidation dramatically due to the excessively large optical bandwidth required in a WDM-PON [8].…”

“…OFDM in particular has attracted much attention in recent years, and many access networks based on OFDM have been demonstrated [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Most of these experiments incorporated high-performing but costly optical components in the ONUs, such as lasers as local oscillators (LOs) for optical coherent detection at the ONU [18], or they used separate fibers for uplink and downlink [17][18][19][20][21]28], or EDFAs [25][26][27][28].…”

“…Most of these experiments incorporated high-performing but costly optical components in the ONUs, such as lasers as local oscillators (LOs) for optical coherent detection at the ONU [18], or they used separate fibers for uplink and downlink [17][18][19][20][21]28], or EDFAs [25][26][27][28].…”