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이한협,Hee Yeal Rhy,이상수,이종현,정환석 한국전자통신연구원 2016 ETRI Journal Vol.38 No.1
A large incoherent crosstalk (IC) caused by amplified spontaneous emission (ASE) noise power from Tx-disabled optical network units and a differential path loss has been shown to degrade upstream transmission performance in time-division multiplexing passive optical networks. This paper considers the IC-induced power penalty of an upstream signal both in an XG-PON and in a TWDM-PON. We investigate the degradation of the extinction ratio and relative intensity noise through a simulation and experiments. For the XG-PON case, we observe a 9.6 dB difference in the level of ASE noise power from Tx-disabled ONUs (hereafter known simply as ASE noise) between our result and the ITU-T XG-PON PMD recommendation. We propose an optical filtering method to mitigate an IC-induced power penalty. In the TWDM-PON case, the IC-induced power penalty is naturally negligible because the ASE noise is filtered by a wavelength multiplexer at the optical line terminal. The results provide design guidelines for the level of ASE noise in both XG-PONs and TWDM-PONs.
TWDM-PON 응용을 위한 4×10 Gb/s Transimpedance Amplifier 어레이 설계 및 구현
양충열(Choong-reol Yang),이강윤(Kang-yoon Lee),이상수(Sang-soo Lee) 한국통신학회 2014 韓國通信學會論文誌 Vol.39 No.7(네트워크)
TWDM-PON 시스템 수신부에 사용될 4×10 Gb/s Transimpedance Amplifier (TIA) 어레이가 0.13 μm CMOS 기술로 구현하였다. TIA의 대역폭 향상을 위하여 인덕터 피킹 기술과 1.2 V 기반의 저전압 설계기술을 제안한다. 0.5 pF PD 용량에서 7 GHz 3 dB 대역폭을 구현한다. 1.2V 공급에서 채널당 31 mW를 소모하는 동안 Trans-resistance gain 은 71.81 dBΩ이다. TIA의 입력 감도는 -33.62 dBm를 갖는다. 4 채널을 포함하는 전체 칩 크기는 1.9 mm × 2.2 mm 이다. A 4×10 Gb/s Transimpedance Amplifier (TIA) array is implemented in 0.13 μm CMOS process technology, which will be used in the receiver of TWDM-PON system. A technology for bandwidth enhancement of a given 4×10 Gb/s TIA presented under inductor peaking technology and a single 1.2V power supply based low voltage design technology. It achieves 3 dB bandwidth of 7 GHz in the presence of a 0.5 pF photodiode capacitance. The trans-resistance gain is 50 dBΩ, while 48 mW/ 1channel from a 1.2 V supply. The input sensitivity of the TIA is -27 dBm. The chip size is 1.9 mm × 2.2 mm.
문실구,이은구,이지현,박혁,강세경,이한협,김광옥,두경환,이현재,정환석,이종현,이상수,이정찬 한국전자통신연구원 2016 ETRI Journal Vol.38 No.1
We demonstrate a time- and wavelength-division multiplexed passive optical network system employing a vertical-cavity surface-emitting laser array–based optical line terminal transceiver and a tunable bidirectional optical subassembly–based optical network terminal transceiver. A packet error–free operation is achieved after a 40 km single-mode fiber bidirectional transmission. We also discuss an arrayed waveguide grating, a photo detector array based on complementary metal–oxide–semiconductor photonics technologies, and low-cost key devices for deployment in access networks.
Performance Analysis of Dynamic Wavelength Allocation Algorithm for TWDM PON with Inexpensive ONUs
Man Soo Han 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.11
In this paper, we introduce a new dynamic wavelength allocation algorithm for a TWDM PON (time and wavelength division multiplexed passive optical network) having inexpensive ONUs (optical network units). The inexpensive ONU has a cheap and low-speed wavelength tuner. The cheap tuner takes from few milliseconds to few seconds to change its wavelength. Most dynamic wavelength allocation algorithms assume that an ONU has a perfect tuner whose tuning time is zero. Unlike most existing algorithms, the proposed algorithm does not ignore the tuning time of an ONU tuner. In the proposed algorithm, an OLT (optical line termination) uses an average grant amount to predict the average packet arrival rates of all ONUs. The OLT decreases the number of active upstream wavelengths if the average grant amount is less than the bandwidth amount of the upstream wavelengths. Otherwise, the OLT increases the number of active upstream wavelengths. Using computer simulations, we show performance of the proposed algorithm and the average number of active upstream wavelengths.
Energy-Efficient Virtual Base Station Formation in Optical-Access-Enabled Cloud-RAN
Xinbo Wang,Thota, Saigopal,Tornatore, Massimo,Hwan Seok Chung,Han Hyub Lee,Soomyung Park,Mukherjee, Biswanath IEEE 2016 IEEE journal on selected areas in communications Vol.34 No.5
<P>In recent years, the increasing traffic demand in radio access networks (RANs) has led to considerable growth in the number of base stations (BSs), posing a serious scalability issue, including the energy consumption of BSs. Optical-access-enabled Cloud-RAN (CRAN) has been recently proposed as a next-generation access network. In CRAN, the digital unit (DU) of a conventional cell site is separated from the radio unit (RU) and moved to the 'cloud' (DU cloud) for centralized signal processing and management. Each DU/RU pair exchanges bandwidth-intensive digitized baseband signals through an optical access network (fronthaul). Time-wavelength division multiplexing (TWDM) passive optical network (PON) is a promising fronthaul solution due to its low energy consumption and high capacity. In this paper, we propose and leverage the concept of a virtual base station (VBS), which is dynamically formed for each cell by assigning virtualized network resources, i.e., a virtualized fronthaul link connecting the DU and RU, and virtualized functional entities performing baseband processing in DU cloud. We formulate and solve the VBS formation (VF) optimization problem using an integer linear program (ILP). We propose novel energy-saving schemes exploiting VF for both the network planning stage and traffic engineering stage. Extensive simulations show that CRAN with our proposed VF schemes achieves significant energy savings compared to traditional RAN and CRAN without VF.</P>