Microsoft PowerPoint - 山形大高野send ppt [互換モード]
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1 , SCOPE,
2 2 CDMA OFDMA OFDM SCOPE, OFDM 0-20 Relative Optical Power [db] Gbps NRZ BPSK-SSB 36dB Relative Frequency [GHz]
3 SSB SSB OFDM SSB SSB OFDM OFDM OFDM Ch1 BER km + 50km Electrical field amplitude [dbμv]
4 4 SSB 100km SSB OHT EHT OHT SSB OHT SSB SCOPE,
5 (SSB) 5 (1) SSB (2) LD LN-Mod LD LN-Mod ω SG c ω ω c ω SG (3) SSB (4) SSB LD LN-Mod-SSB LD LN-Mod π/2 π/2 HT SG HT ω c ω SG ω c ω HT: Hilbert Transformer () SCOPE,
6 SSB 6 f in f in (t) ( t) cos( ω t) = SCOPE, s f out cos(ω c t) π 2 = cos( ω π 2 s c ωs ) t f out (t) 0 ω ω c 0 ω c ( t) = cos( ω t)cos( ω t) + sin( ω t)sin( ω t) c DSB-SC () s 1/2 c SSB-SC ω π/2
7 SSB 7 CW light d(t) d(t) In-Phase Modulated light Optical waveguide Electrode (phase modulator) Baseband Signal Generator SCOPE, ± π/2 Hilbert Transformer d H (t) d H (t) E/O d(t) d H (t) H(ω) Quadrature-Phase S. Shimotsu et al., PTL, 13, 4, pp , (2001). Application: Advanced Modulation (FSK, DQPSK, SSB etc. ) H(ω) arg{h(ω)} 1 π 0 ω π 2 0 ω 2
8 8 Antenna 75 -> 50 Impedance Converter BPF MHz LD G: 40dB 90 o Hybrid I Q (Hilbert Trans.) P-Con Bias I : Quad. Q: Null D-Line: optical tunable delay line ATT: optical variable attenuator P-Con: polarization controller OSA: optical spectrum analyzer Scope: oscilloscope with optical interface SMF Impedance Converter 75 <- 50 Evaluation Equipment PD & TIA λ C :1552.5nm 10 db Coupler Monitor LN-Mod DC Δλ: 0.9nm ATT Tunable BPF Optical Attenuator Isolator Isolator 50 km EDFA G: 24dB NF: 5.0dB SMF 50 km SCOPE,
9 SSB 9 f S : 5 GHz LD 90 o Hybrid I Q (Hilbert Trans.) P-Con 600mVpp Bias I : Quad. Q: Null λ C :1552.5nm LN-Mod DC Isolator Scope OSA SCOPE, SSR: dB
10 10 NHK-E NHK-G YTS TUY YBC SAY Ch. No. TV ch. Freq. MHz Ch. No. TV ch. Freq. MHz 24 NHK-E YTS NHK-G TUY YBC SAY SCOPE,
11 11 BER B to B 24ch ch 32ch 34ch 37ch 40ch Electrical field amplitude [dbμv] BER BER km + 50km Electrical field amplitude [dbμv] Penalty [db] ch 28ch 32ch 34ch 37ch 40ch TV channel RF ch SCOPE,
12 OFDMEDFA 12 WDM EDF (1480 nm) [nm] α [db/m] g [db/m] P SAT [mw] ms 100mW EDF : 14m 14.3dB 14dBm NF 6dB Gain [db] BPF EDFA (-4.8dBm, 12.8dB) Input power [dbm] NF [db] SCOPE,
13 EDFA 13 EDFA gain [db] EDFA [db] SCOPE, Subcarrier: [Mbps] Time [μs] 13.2 B: 80kbps B: 8 Mbps EDFA gain [db] Time [μs]
14 FIR h hil (n) Mach-Zehnder (MZI) Input fiber M: mirror HM: half mirror CM: corner mirror M2 SCOPE, rd order R 1 HM1 n CM CM M1 R2 HM2 Z 1 + Z 1 h(0) h(1) h(2) Output fiber + c > B ΔL λ C ΔL = ( 2i 1) 2 h(1)=0 ΔL: path difference B: bit rate i: integer
15 SSB 15 LD LN-Mod EDFA BPF ATT D-Line I 1:1 1:1 λ C :1552.5nm V DRV : V π Bias: Null f S : 10 GHz SSB O-HT (MZI) 8.11 db FSR: 43 GHz OSA P-Con 10 db Coupler Q Isolator Scope Upper sideband Lower sideband nearly DC. SCOPE, t
16 OHT 3 7 (a) h(n) 2, n = odd h( n) = nπ 0, n = even τ n (b) 7 MZI_1 h(n) τ MZI_ n Input 1:1 2τ π Output Input 1 α : α DL_1 2τ 1:1 1:1 2τ 6τ π π MZI_1 MZI_2 Output SCOPE,
17 SSB 7 OHT LD LN-Mod EDFA BPF λ C :1552.5nm [db] V DRV : V π Bias: Null f S : 10 GHz SCOPE, :1 SSB db LSB USB ATT USB: LSB: D-Line P-Con LD: Laser diode LN-Mod: LiNbO 3 Intensity modulator EDFA: Er 3+ doped fiber amplifier BPF: Optical bandpass filter D-Line: optical tunable delay line 1:1 OSA I Q Isolator Scope ATT: optical variable attenuator P-Con: polarization controller OSA: optical spectrum analyzer Scope: oscilloscope with optical interface
18 3 7 (a) 3 (b) GHz 35 GHz 3 or 7 OSA SCOPE,
19 10 Gbps PN: 7-stage(NRZ) SCOPE, d(t) PPG d(t) Hilbert Transformer H(ω) LD λ s : 1550 nm d H (t) H I (ω) arg{h I (ω)} 1 ω 0 0 H I ( ω) Ideal H.T. = j sgn 0 π 2 π 2 ( ω) ( ω 0) ( ω = 0) d H (t) ω V B (t) V B (t) V H (t) V H (t) H H ω c LN - SSB modulator π/2 Mod. depth: 0.05 Bias point: null to transmission fiber PPG: Pulse Pattern Generator LD: Laser Diode LN: Lithium Niobate H H (ω) arg{h H (ω)} π 2 ω 0 ω c 0 π 2 j sgn ω ω > 2ωc ω = j sgn( ω) sin 2π ( ω 8ω c ) ω 2ωc ω c = 2πf c, f c : Cut-off frequency ( ) High-pass H.T. 19 ω ( ) ( ) { } ( )
20 HT SSB 20 理想 HT: 無 f c = 0.5 GHz HT f c = 3 GHz f c = 5 GHz [db] I-HT Optical SSB-SC f c [GHz] HP-HT Optical SSB (0.5) HP-HT Optical SSB (1.5) HP-HT Optical SSB (3.0) HP-HT Optical SSB (5.0) [dbm] SCOPE, (x: 0.05, P t,ave : 8 dbm) SPM (EOD = 1dB) 15.3 db SPM
160GHz
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