10-Gb/s operation of RSOA for WDM PON

Dept. of Electr. Eng., KAIST, Daejeon
IEEE Photonics Technology Letters (Impact Factor: 2.11). 10/2008; 20(18):1533 - 1535. DOI: 10.1109/LPT.2008.928834
Source: IEEE Xplore


We report on the 1O-Gb/s operation of the reflective semiconductor optical amplifier (RSOA) for the next-generation wavelength-division-multiplexed passive optical network (WDM PON). The bandwidth of the RSOA used in this experiment is merely 2.2 GHz. Nevertheless, a clear eye opening is obtained at 10 Gb/s by using the electronic equalizer processed offline. We investigate the impacts of the network's operating conditions (such as the injection power to the RSOA and the fiber length) on the performances of these equalizers. The results show that the RSOA-based WDM PON is operable at 10 Gb/s and the maximum reach can be extended to >20 km with the help of the forward error correction codes.

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    • "Recently, there have been several attempts to operate these low-bandwidth devices at 10-Gb/s and beyond, including advanced modulation formats [12]–[15], post detection electrical signal processing [16]–[18], and offset optical filtering together with electrical equalization [19]. Recently, H. Kim has proposed and demonstrated 10-Gb/s operation of a transistor-outlook (TO) can packaged RSOA using an optical delay interferometer (DI) [20]. "
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    ABSTRACT: This paper presents long reach wavelength division multiplexing passive optical network (WDM-PON) system capable of delivering downstream 20 Gbit/s data and upstream 10 Gbit/s data on a single wavelength. The optical source for downstream data and upstream data is mode locked laser at central office and reflective semiconductor optical amplifier (RSOA) at each optical network unit. We use two RSOAs at each optical network unit for the 10-Gb/s upstream transmission. The operating wavelengths of these RSOAs are separated by the free-spectral range of the cyclic arrayed waveguide gratings used at the central office and remote node (RN) for (de)multiplexing the WDM channels. We extend the maximum reach of this WDM PON to be 45 km by using Erbium-doped fiber amplifiers at the RN.The hybrid amplifier is designed to enhance the signal power and compensated the fiber dispersion over a wide wavelength range. Optical Equalization technique is used before the receiver to improve modulation bandwidth of an RSOA based colorless optical network unit. Optical Equalization technique helps to improve downlink and uplink performance. Author also investigates analysis of backscattered optical signal for upstream data and downstream data simultaneously. Bit error rate, backscattered optical signal power were measured to demonstrate the proposed scheme. In this paper Long reach and large data service aspects of a WDM-PON is presented.
    Optical and Quantum Electronics 08/2014; 46(368):1969 - 2014. DOI:10.1007/s11082-014-9952-9 · 0.99 Impact Factor
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    • "UWB signal from first-order to forth-order is generated from the scheme. RSOA is a colorless and cost-effective device that is commonly used in optical access networks [17], [18]. RSOA has been used to generate low-order UWB signals. "
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    ABSTRACT: We propose and experimentally demonstrate a reflective semiconductor optical amplifier (RSOA)-based Mach–Zehnder interferometer structure for generating high-order ultrawideband (UWB) signals. First, low-order UWB signals are generated by controlling the bias current of the RSOA. To convert the generated low-order UWB signals to high-order UWB signals, the polarization overlaying technique is used in an interferometer structure. The generated high-order UWB signals well satisfy Federal Communications Commission spectral regulations, and the interference with GPS band at 1.57542 GHz is suppressed.
    IEEE Photonics Journal 04/2014; 6(2):1-7. DOI:10.1109/JPHOT.2014.2306832 · 2.21 Impact Factor
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    • "In literature several techniques were studied and reported to compensate for the R-SOA limited bandwidth. A simple approach is the electrical equalization, which can be applied either as a passive pre-emphasis at the transmitter side [1], or at the receiver side [2]–[4]. Optical equalization, based on the interplay between R-SOA nonlinear chirp and proper offset optical filtering [5], [6] provides the same functionality but in a much simpler way, as common in-line components may provide for the effective bandwidth enhancement without requiring modification to the transmitter or the receiver (i.e. it works with commercial transceivers) [7]. "
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    ABSTRACT: We report the first demonstration of a 40 Gb/s orthogonal frequency division multiplexing (OFDM) optical system exploiting a common 1 GHz bandwidth R-SOA and direct detection. To this aim, we combined the use of two techniques, i.e., the adaptive OFDM signaling and the optical equalization. Adaptive OFDM (with optimized bit- and power-loading) allowed us to increase the spectral efficiency and the resilience to chromatic dispersion. Optical equalization was obtained by the interplay between the chirped signal produced by the reflective semiconductor optical amplifiers (R-SOA) and a detuned WDM demultiplexer. This allowed us to increase the useful channel bandwidth to > 10 GHz. By this combination and using state of the art A/D and D/A converters, a 40 Gb/s signal is successfully transmitted over a 26 km SMF optical ring.
    IEEE Photonics Technology Letters 11/2013; 25(21):2119-2122. DOI:10.1109/LPT.2013.2282001 · 2.11 Impact Factor
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