Fiber-fed wireless systems based on remote up-conversion techniques
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2 2008 Radio and Wireless Symposium incorporating WAMICON January 2008, Orlando, FL. Fiber-fed wireless systems based on remote up-conversion techniques Jae-Young Kim and Woo-Young Choi Dept. of Electrical and Electronic Engineering, Yonsei University, Seoul, Korea Slide 1
3 Outline 1. Radio over Fiber for 60GHz WLAN 2. Remote up-conversion techniques 3. Optoelectronic mixer based on InP HBT 4. Optically injection-locked self-oscillating optoelectronic mixer (OIL-SOM) based on InP HBT 5. Summary Slide 2
4 60GHz for Wireless Networks Broadband Wireless Access High-speed Wireless LAN Wireless HD video transmission Wireless Personal Area Network (WPAN) Growing interest in 60GHz - 60GHz as unlicensed band - IEEE C explores 60GHz band for WPAN Slide 3
5 Fiber-Fed Fed wireless system for wireless networks Building Satellite communication Radio-over-Fiber (RoF) systems - Ultra-wide bandwidth - Low transmission loss - Effective linkage with optical networks Antenna base station Antenna base station Household Central Office Outdoor service Optical fiber Underground shopping mall Slide 4
6 Fiber-Fed Fed wireless system for wireless networks Optical fiber PCs PDA Notebook Antenna base station HDTV High transmission loss in air - Pico cell topology - Many antenna base stations Key issue - Simple antenna base stations Slide 5
7 Architectures for Fiber-Fed Fed Wireless Systems Baseband Central station Base station Complex base station Data E O O E MOD IF RF LO IF feeder (Remote up-conversion) Data MOD E O O E IF RF LO Optical MMW Data MOD IF RF E O O E Simple base station LO High-speed photo-detector Slide 6
8 IF feeder with optical LO distribution Data MOD E O O/E mixer LO Why InP HBT? - Optoelectronic mixing - High optical responsivity - High-speed operation - MMIC-compatibility SOA + EAM - J. S. Seo, etc, IEEE MTT, Feb 2006 InP HEMT O/E mixer - C. S. Choi, etc, IEEE MTT, Nov 2004 InP HBT O/E mixer HBT: Heterojunction Bipolar Transistor Slide 7
9 InP Heterojunction Bipolar Transistor Optical illumination InP emitter 50nm InGaAs base Absorption region 300nm InGaAs collector Semi-insulating InP substrate Phototransistor internal gain [db] Tr-mode PD-mode G int Optical f T = 63GHz -5 -Optical BW 3dB = 1.7GHz -f T = 153GHz, f max = 94GHz 1E8 1E9 1E10 Optical modulation frequency [Hz] Fabricated in NTT Photonics Laboratories, Japan Slide 8
10 Operation Principles and Characteristics of HBT O/E mixers Slide 9
11 HBT Optoelectronic Mixer with optical LO λ IF ƒ IF = 500MHz Optical IF ƒ LO = 60GHz InP HBT RF ƒ LO ± ƒ IF 60GHz Amp. λ LO Optical LO Photo-detector + mixer O/E mixer - Optical LO distribution - Elimination of LO in many ABSs - But, low conversion efficiency Slide 10
12 HBT Self-oscillating optoelectronic Mixer λ IF ƒ IF = 400MHz Optical IF ƒ LO = 30GHz RF ƒ LO ± ƒ IF HBT Oscillator 30GHz 60GHz Amp. f IF λ LO Optical LO - High power LO generation - Improved conversion efficiency - Integrated Oscillator also possible Optical injection-locking and Self-oscillating mixing (OIL-SOM) f LO Slide 11
13 HBT Self-oscillating optoelectronic Mixer λ IF λ LO ƒ IF = 400MHz Optical IF ƒ LO = 30GHz Optical LO - High power LO generation - Improved conversion efficiency - Integrated Oscillator also possible Detected signal [dbm] ƒ LO - ƒ IF 2ƒ LO Frequency [GHz] 2ƒ LO + ƒ IF (Used 2 nd harmonic for 60GHz applications) Slide 12
14 HBT MMIC self-oscillating mixer Optical LO 10GHz V C HBT HBT V B V cont1 V cont2 -Low Q value - Wide locking range 10GHz MMIC oscillator Fabricated in NTT Photonics Laboratories, Japan Slide 13
15 Phase noise reduction by optical injection-locking SSB Phase noise [dbc/hz] GHz Free-running 30GHz Injection-locked 10GHz optical LO k 100k 1M 10M Presented in IMS 2007 Frequency offset [Hz] Slide 14
16 Thermal variation of oscillation frequency Central Station Antenna Base Station Free-running Oscillation frequency [GHz] ~ 191 KHz/degree 18 MHz Temperature [ K ] - The self-oscillating frequency varies with temperature IEEE MTT, Dec, 2007 Slide 15
17 Wide optical injection-locking range Central Station 1k For 10GHz fundamental LO Antenna Base Station Free-running Locking Range [MHz] ~ 1.5GHz Locking range at 6dBm optical LO Optical LO power [dbm] - Wide locking range for maintaining injection-locking in ABS Slide 16
18 Link demonstrations using O/E mixers Central station Base station Optical IF 60GHz Optical LO HBT O/E mixer 60GHz Bi-directional link Optical IF 30GHz Optical LO 30GHz Hybrid Self-oscillating mixer (2 nd harmonic operation) 60GHz Downlink Optical IF 10GHz Optical LO 10GHz MMIC Self-oscillating mixer (3 rd harmonic operation) 30GHz Bi-directional link Slide 17
19 60GHz Bi-directional link using HBT O/E Mixer Central station Base station Optical IF 60GHz Optical LO HBT O/E mixer 60GHz Bi-directional link Slide 18
20 60GHz bi-directional links based on HBT Central Station Antenna Base Station PD Uplink DFB LD 2GHz Optical IF/Data ƒ IF =1.25GHz IF Amp GHz λ IF Diplexer PA 62GHz Optical LO λ LO Downlink LNA InP HBT O/E up/down mixer 60GHz IEEE PTL, Dec, 2005 Slide 19
21 Downlink transmission (Up-conversion) Central Station Antenna Base Station Optical IF/Data (16QAM 20Mbps) ƒ IF =1.25GHz λ IF 63.5GHz PA 63.25GHz 62GHz Optical LO λ LO Downlink InP HBT O/E mixer Slide 20
22 Downlink transmission results Frequency up-converted spectrum Eye-diagram and constellation 16QAM constellation Eye diagram Frequency down-conversion LPF Vector Signal Analyzer EVM =4.53% Slide 21
23 Uplink transmission (Down-conversion) Central Station Antenna Base Station 2GHz IF Amp. Diplexer Optical LO 62GHz λ LO Downlink LNA InP HBT O/E up/down mixer 60GHz (16QAM 20Mbps) Slide 22
24 Uplink transmission results Frequency down-converted spectrum Eye-diagram and constellation 16QAM constellation Eye diagram LPF Vector Signal Analyzer EVM =4.67% Slide 23
25 Resulting EVM VS optical LO power Downlink Uplink Error Vector Magnitude (EVM), [%] EVM Optical IF power = -2dBm Error Vector Magnitude (EVM), [%] EVM Optical LO power [dbm] Optical LO power [dbm] Slide 24
26 60GHz Downlink using HBT Self-oscillating Mixer Central station Base station Optical IF 30GHz Optical LO 30GHz Hybrid Self-oscillating mixer (2 nd harmonic operation) 60GHz Downlink Slide 25
27 Hybrid OIL-SOM for 60GHz downlink Central Station Antenna Base Station Optical IF/Data ƒ IF =0.42GHz 60GHz 60GHz (16QAM 20Mbps) Optical LO λ IF 30.21GHz λ LO Downlink 10dB coupler 30.21GHz OIL-SOM 30GHz (2 nd harmonic for 60GHz applications) Presented in OFC 2006 Slide 26
28 Frequency up-converted spectrum Downlink transmission results Frequency down-conversion LPF Slide 27
29 Resulting constellation and EVMs 16QAM constellation Eye diagram EVM =4.74% Optical LO power = -3dBm Error Vector Magnitude (EVM) [%] dB Optical LO power [dbm] - Insensitive link performance on optical LO power Slide 28
30 30GHz Bi-directional link using HBT Self-oscillating Mixer Central station Base station Optical IF 10GHz Optical LO 10GHz MMIC Self-oscillating mixer (3 rd harmonic operation) 30GHz Bi-directional link Slide 29
31 MMIC OIL-SOM for 30GHz bi-directional link Central Station Antenna Base Station PD Uplink DFB LD 2.2GHz Optical IF/Data ƒ IF =1.4GHz Bias-T IF Amp. 31GHz Diplexer PA λ IF HBT 10.8GHz Optical LO Downlink HBT V cont1 V cont2 30.2GHz λ LO 10GHz MMIC oscillator Slide 30
32 Resulting constellation and eye-diagram Downlink Uplink 32QAM constellation 32QAM constellation Eye diagram Eye diagram EVM =4.34% Optical LO power = 0dBm Optical IF power = 0dBm EVM =5.47% Optical LO power = 0dBm Slide 31
33 Resulting EVM VS optical LO power Downlink Uplink Error Vector Magnitude (EVM), [%] Optical IF power = 0dBm Optical LO power [dbm] Error Vector Magnitude (EVM), [%] Uplink RF power = -10dBm Optical LO power [dbm] Slide 32
34 Summary InP HBT/oscillator-based optoelectronic mixers - For effective fiber-fed wireless systems - Support simple base station architecture - Possibility of integrated antenna base station with RF circuits - Effective frequency conversion with low power optical LO Acknowledgement - Dr. Kamitsuna at NTT Photonics Laboratory, Japan - Dr. Chang-Soon Choi (Presently at IHP, Germany) Q & A Slide 33
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