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  • Demonstration of digital fronthaul over self-seeded WDM-PON in commercial LTE

    environment Yiran Ma,1,* Zhiguang Xu,2 Chengliang Zhang,1 Huafeng Lin,2 Qing Wang,3 Min Zhou,2

    Heng Wang,2 Jingwen Yu,1 and Xiaomu Wang1 1China Telecom Co. Ltd. Beijing Research Institute, 118 Xizhimenneidajie, Xicheng District, Beijing, 100035, China

    2 Advanced Technology Department, Huawei Technologies, Bantian, Longgang District, Shenzhen, 518129, China 3 Hubei P&T plan-design Co. LTD., 2 Changqing Third Road, Jianghan District, Wuhan, 430023, China

    *mayr@ctbri.com.cn

    Abstract: CPRI between BBU and RRU equipment is carried by self-seeded WDM-PON prototype system within commercial LTE end-to-end environment. Delay and jitter meets CPRI requirements while services demonstrated show the same performance as bare fiber. 2015 Optical Society of America OCIS codes: (060.4250) Networks; (060.2330) Fiber optics communications.

    References and links 1. F. Saliou, P. Chanclou, B. Charbonnier, B. Le Guyader, Q. Deniel, A. Pizzinat, N. Genay, Z. Xu, and H. Lin,

    Up to 15km cavity self seeded WDM-PON system with 90km maximum reach and up to 4.9Gbit/s CPRI links, presented at European Conference and Exhibition on Optical Communication, paper We.1.B.6, Amsterdam Netherlands, September 2012.

    2. F. Saliou, G. Simon, P. Chanclou, M. Brunero, L. Marazzi, P. Parolari, M. Martinelli, R. Brenot, A. Maho, S. Barbet, G. Gavioli, G. Parladori, S. Gebrewold, and J. Leuthold, Self-Seeded RSOAs WDM PON Field Trial for Business and Mobile Fronthaul Applications, presented at Optical Fiber Communication Conference, paper M2A.2, Los Angeles, USA, March 2015.

    3. Y. Ma, D. Liu, J. Yu, and X. Wang, System evaluation of economic 16/32chs 1.25Gbps WDM-PON with self-seeded RSOA, Opt. Express 20(20), 2252322530 (2012).

    4. A. Chiuchiarelli, M. Presi, and E. Ciaramella, Effective architecture for 10 Gb/s upstream WDM-PONs exploiting self-seeding and external modulation, presented at Optical Fiber Communication Conference, paper JTh2A, Los Angeles, USA, March 2012.

    5. F. Xiong, W. Zhong, M. Zhu, H. Kim, Z. Xu, and D. Liu, Characterization of Directly Modulated Self-Seeded Reflective Semiconductor Optical Amplifiers Utilized as Colorless Transmitters in WDM-PONs, J. Lightwave Technol. 31(11), 17271733 (2013).

    6. U. R. Duarte, R. S. Penze, F. R. Pereira, F. F. Padela, J. B. Rosolem, and M. A. Romero, Combined Self-Seeding and Carrier Remodulation Scheme for WDM-PON, J. Lightwave Technol. 31(8), 13231330 (2013).

    7. T. Komljenovic, D. Babic, and Z. Sipus, C and L band Self-seeded WDM-PON Links using Injection-locked Fabry-Prot Lasers and Modulation Averaging, presented at Optical Fiber Communication Conference, paper W3G.1, San Francisco, USA, March 2014.

    8. P. Parolari, L. Marazzi, M. Brunero, M. Martinelli, R. Brenot, A. Maho, S. Barbet, G. Gavioli, G. Simon, S. Le, F. Saliou, and P. Chanclou, C- and O-Band Operation of RSOA WDM PON Self-Seeded Transmitters up to 10Gb/s, J. Opt. Commun. Netw. 7(2), A249A255 (2015).

    9. J. Zhu, S. Pachnicke, M. Lawin, S. Mayne, A. Wonfor, R. V. Penty, R. Cush, R. Turner, P. Firth, M. Wale, I. H. White, and J. Elbers, First Demonstration of a WDM-PON System Using Full C-band Tunable SFP+ Transceiver Modules, J. Opt. Commun. Netw. 7(1), A28A36 (2015).

    10. S. Le, A. Lebreton, F. Saliou, Q. Deniel, B. Charbonnier, and P. Chanclou, Up to 60 km Bidirectional Transmission of a 16 Channels 10 Gb/s FDM-WDM PON Based on Self-Seeded Reflective Semiconductor Optical Amplifiers, presented at Optical Fiber Communication Conference, paper Th3G.8, San Francisco, USA, March 2014.

    11. Y. Ma, Z. Xu, H. Lin, M. Zhou, H. Wang, C. Zhang, J. Yu, and X. Wang, Demonstration of CPRI over Self-seeded WDM-PON in Commercial LTE Environment, presented at Optical Fiber Communication Conference, paper M2J.6, Los Angeles, USA, March 2015.

    12. P. Chanclou, F. Effenberger, R. Heron, D. Hood, D. Khotimsky, and A. Rafel, Next-generation 2 access network technology, Full-service access network white paper, 2012.

    #233852 - $15.00 USD Received 4 Feb 2015; revised 18 Apr 2015; accepted 19 Apr 2015; published 28 Apr 2015 2015 OSA 4 May 2015 | Vol. 23, No. 9 | DOI:10.1364/OE.23.011927 | OPTICS EXPRESS 11927

  • 1. Introduction

    Passive optical network (PON) such as Ethernet PON (EPON) and Gigabit PON (GPON) has been widely used in fiber-to-the-home (FTTH) deployment nowadays. Many advantages have been shown for PON system, such as passive infrastructure, no line interference, high bandwidth, and etc. Currently, PON is more and more used to carry multiple services such as fronthaul of Common Public Radio Interface (CPRI) protocol data of wireless distributed sites because it can take advantage of the rich installed fiber resource. EPON and GPON will be not sufficient to provide enough bandwidth and satisfied performance for fronthaul applications. Though EPON and GPON can be upgraded to 10G EPON and 10G GPON respectively, the nature problems of time division multiplexed PON (TDM-PON) such as security problem and bandwidth sharing problem still prevent it from being used for fronthaul. Recently, wavelength division multiplexed PON (WDM-PON) is frequently proposed to carry CPRI data between building base band unit (BBU) and remote radio unit (RRU) in long term evolution (LTE) scenarios due to its advantages on high and dedicated bandwidth, low jitter and latency [1,2]. However, only a small portion of CPRI performance parameters such as latency, bit error rate (BER) and sensitivity have been analyzed. Compared with the current solution where bare fiber is used to carry CPRI, WDM-PON could save trunk fiber, extend the transmission reach, provide protection schemes. Moreover, if BBUs are concentrated as a pool, many BBUs require tremendous connections to RRUs if using bare fiber. Many optical solutions have been raised to meet strict CPRI requirements using one trunk fiber with WDM technology, such as optical transport network (OTN) and dense WDM (DWDM). However, these technologies are not able to perform real colorless operation as manual adjustment of wavelengths is still required. There have been discussions in Full Service Access Network (FSAN) that one of the main scenarios of next generation PON (NG-PON2) especially WDM-PON would be fronthaul of CPRI data. The key technology for WDM-PON is colorless transceivers to achieve convenience of installation and low inventory. Self-seeded reflective semiconductor optical amplifier (RSOA) is proposed as a promising technique to achieve colorless transceivers [310].

    In this paper, a WDM-PON with self-seeded RSOAs both in downstream and upstream is demonstrated. Different from the previous reports by us [3], a novel WDM-POM integrated optical module is demonstrated for the first time and applied in our self-seeded system. The optical module has a high density integrated structure and the whole size is perfectly fabricated in Quad Small Form-factor Pluggable (QSFP) type. Due to an innovative design with both optical and electrical interfaces at the same side, the optical module can be flexibly pluggable and there are no complex connected fibers between modules except for only one main optical output port for launching to the feeder fiber, so as to make the whole WDM-PON mainframe look simple and efficient. More detailed descriptions and performance evaluation of the WDM-PON prototype system are provided based on our previous work [11]. Then a trial that uses the WDM-PON system to carry CPRI is conducted for the first time with commercial LTE equipments including LTE core network system architecture evolution (SAE), BBU, RRU, LTE antenna working in 1800 MHz band, LTE data card and LTE cell phone. It is shown WDM-PON could meet stringent CPRI requirements including latency, frequency error, error vector magnitude (EVM) and latency accuracy. Additional tests are performed in this paper including phase noise compared with our previous work [11]. Then real network services such as file transfer protocol (FTP) and high definition video are carried to show that WDM-PON will not introduce any performance degradation compared with bare fiber.

    2. Setup of self-seeded WDM-PON system

    The principle of self-seeded WDM-PON is to put a faraday rotator mirror (FRM) with partially reflectivity next to the arrayed waveguide grating (AWG) [12]. Figure 1 shows the schematic diagram of self-seeded WDM-PON system with the newly designed integrated optical module. The left square can be considered as an optical line terminal (OLT) board

    #233852 - $15.00 USD Received 4 Feb 2015; revised 18 Apr 2015; accepted 19 Apr 2015; published 28 Apr 2015 2015 OSA 4 May 2015 | Vol. 23, No. 9 | DOI:10.1364/OE.23.011927 | OPTICS EXPRESS 11928

  • with four integrated optical modules inserted into the board cages. Each module is connected with AWG 1 and AWG 2 through two 4 ch fiber arrays, respectively. One is for upstream and the other is for downstream. All the downstream fiber arrays are connected with the drop ports of AWG 1, while upstream fiber arrays are connected with drop ports of AWG 2. The common ports of AWG 1and AWG 2 are combined by Circulator 1 to the feeder fiber. FRM 1 with 70% light reflection and 30% pass is located between AWG 1 and Circulator 1. In detail, Port 1of Circulator 1 is connected with the FRM output, Port 2 is connected to the feeder fiber, and Port 3 is connected to AWG 2.

    Fig. 1. Schematic diagram of self-seeded WDM-PON system.

    The other integrated optical module at the right side of Fig. 1 can be considered as the optical network unit (ONU). FRM 2, Circulator 2, AWG 3 and AWG 4 form a remote node (RN) in WDM-PON ODN with 0 to 5 km drop fiber reaching the ONU modules. AS for symmetry, FRM 2 is also designed with 70% light reflection