SCIENCE CHINA Information Sciences Contents Vol. 61 No. 8 August 2018 Special Focus on Photonic Devices and Integration Hybrid-cavity semiconductor lasers with a whispering-gallery cavity for controlling Q factor ............................................................ 080401(13) Yongzhen HUANG, Xiuwen MA, Yuede YANG, Jinlong XIAO & Yun DU Silicon-based on-chip diplexing/triplexing technologies and devices .................................................................................................... 080402(15) Yaocheng SHI, Jingye CHEN & Hongnan XU Silicon chip-scale space-division multiplexing: from devices to system ............................................................................................... 080403(18) Yu YU, Chunlei SUN & Xinliang ZHANG Photonic integration technologies for indoor optical wireless communications .................................................................................... 080401(13) Yuqing JIAO & Zizheng CAO Fabrication of InP-based monolithically integrated laser transmitters ................................................................................................... 080405(19) Song LIANG, Dan LU, Lingjuan ZHAO, Hongliang ZHU, Baojun WANG, Daibing ZHOU & Wei WANG A 70 Gbps NRZ optical link based on 850 nm band-limited VCSEL for data-center intra-connects ................................................... 080406( 7 ) Zhongwei TAN, Chuanchuan YANG, Yixiao ZHU, Zhaopeng XU, Kaiheng ZOU, Fan ZHANG & Ziyu WANG Silicon-based on-chip hybrid (de)multiplexers ....................................................................................................................................... 080407(14) Chenlei LI, Hao WU, Ying TAN, Shipeng WANG & Daoxin DAI A real-time tunable arbitrary power ratios graphene based power divider ............................................................................................. 080408( 3 ) Haowen SHU, Yuansheng TAO, Ming JIN, Xingjun WANG & Zhiping ZHOU REVIEW Overview of 5G security technology ....................................................................................................................................................... 081301(25) Xinsheng JI, Kaizhi HUANG, Liang JIN, Hongbo TANG, Caixia LIU, Zhou ZHONG, Wei YOU, Xiaoming XU, Hua ZHAO, Jiangxing WU & Ming YI From octahedral structure motif to sub-nanosecond phase transitions in phase change materials for data storage .............................. 081302(15) Zhitang SONG, Sannian SONG, Min ZHU, Liangcai WU, Kun REN, Wenxiong SONG & Songling FENG RESEARCH PAPER BER analysis of STBC hybrid carrier system based on WFRFT with frequency domain equalization ................................................ 082301(13) Zhenduo WANG, Lin MEI, Xuejun SHA & Naitong ZHANG User scheduling for downlink FD-MIMO systems under Rician fading exploiting statistical CSI ....................................................... 082303(10) Xiao LI, Tingting SUN, Nana QIN, Shi JIN & Xiqi GAO A unified approach of energy and data cooperation in energy harvesting WSNs .................................................................................. 082303(13) Roomana YOUSAF, Rizwan AHMAD, Waqas AHMED & Fu-chun ZHENG A pseudo-random sequence generation scheme based on RNS and permutation polynomials ............................................................. 082304(12) Shang MA, Jianfeng LIU, Zeguo YANG, Yan ZHANG & Jianhao HU Uplink spectral efficiency analysis of multi-cell multi-user massive MIMO over correlated Ricean channel ..................................... 082305(14) Juan CAO, Dongming WANG, Jiamin LI, Qiang SUN & Ying HU Precoder design in downlink CoMP-JT MIMO network via WMMSE and asynchronous ADMM ..................................................... 082306(13) Zhikun WU & Zesong FEI MOOP Bowel sound recognition using SVM classification in a wearable health monitoring system ............................................................... 084301( 3 ) Yue YIN, Hanjun JIANG, Shulin FENG, Juzheng LIU, Ping CHEN, Binjie ZHU & Zhihua WANG LETTER Energy efficient power allocation for underlaying mobile D2D communications with peak/average interference constraints ........... 089301( 3 ) Rui ZHANG, Yongzhao LI, Cheng-Xiang WANG, Yuhan RUAN & Hailin ZHANG Novel spectrum sensing and access in cognitive radio networks ........................................................................................................... 089302( 3 ) Shibing ZHANG, Yingdong HU, Li ZHANG & Zhihua BAO Nonbinary LDPC cycle codes: efficient search, design, and code optimization .................................................................................... 089303( 3 ) Hengzhou XU, Chao CHEN, Min ZHU, Baoming BAI & Bo ZHANG Adaptive network-aware FeLAA LBT strategy for fair uplink FeLAA-WiFi coexistence ................................................................... 089304( 3 ) Wei WANG, Pingping XU, Yuan ZHANG & Hongyun CHU Multi-objective network optimization combining topology and routing algorithms in multi-layered satellite networks ..................... 089305( 3 ) Zhuoming LI, Huiyun XIA, Yu ZHANG, Junqing QI, Shaohua WU & Shushi GU Worst-case robust energy harvesting maximization in cellular networks .............................................................................................. 089306( 3 ) Donghua CHEN, Yucheng HE, Lin ZHOU & Rui ZHAO .