Multi-wavelength 40 GHz pulse source based on saturated

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Multi-wavelength 40 GHz pulse source based on saturated optical parametric amplifier David Dahan and Gadi Eisenstein Technion - Israel Institute of Technology Department of Electrical Engineering OAA - June 2004 - San Francisco

Outlines § Motivations § Multi-wavelength pulse source principle of operation § Experimental set up and results § Conclusion OAA - June 2004 - San Francisco

Motivations How can we cope with the increasing demand in information capacity? Development of multi-wavelength optical pulse sources at high repetition rate Super-continuum generation Optical parametric amplification OAA - June 2004 - San Francisco

Using the exponential dependence of the OPA on the Pump power, the pulsed pump can be replaced by a sinusoidally modulated pump * For G>>1 * J. Hansryd et al. “ Simple and robust 40 GHz RZ pulse source based on a fiber optical parametric amplifier “, OFC 2001, paper WA. 5 OAA - June 2004 - San Francisco

Multi-wavelength pulse source : principle of operation Pump CW MZ HNLF Signal CW λid 5 λid 3 λid 1 λp λs λid 2 λid 4 A high input CW signal saturates the OPA : high FWM orders are generated λp λs OAA - June 2004 - San Francisco

Multi-wavelength pulse source : Experimental set up EDFA 1 EDFA 3 Pump λp=1543 nm HNLF (4 km) Φ TL MZ BPF 1 20 GHz 50/50 AWG 223 -1 PRBS Signal 2. 5 Gb/s EDFA 4 OSC λs=1551. 5 nm BPF 2 TL PC EDFA 2 OSA / Auto BPF 3 Photo-detector VOA HLNF : λ 0=1536. 3 nm, S=0. 018 ps/nm 2, γ = 10. 6 W-1/km OAA - June 2004 - San Francisco

OPA spectrum 20 10 no signal Psin= -20 d. Bm Psin = -15 d. Bm Psin = -10 d. Bm Psin = - 5 d. Bm Psin = 0 d. Bm Psin =5 d. Bm Psin =10 d. Bm Power [d. Bm] 0 -10 -20 -30 -40 -50 Idler 3 1510 1520 1530 Idler 1 Pump Signal 1540 1550 Idler 2 1560 Idler 4 1570 1580 Wavelength [nm] OAA - June 2004 - San Francisco

Ps= -10 d. Bm Idler 1 Pump TFWHM = 6. 3 ps TFWHM = 6. 5 ps Signal TFWHM = 6. 5 ps Idler 2 TFWHM = 4. 9 ps Idler 4 TFWHM = 4. 2 ps OAA - June 2004 - San Francisco

Ps=5 d. Bm Idler 1 TFWHM = 7. 1 ps Pump TFWHM = 7. 75 ps Signal TFWHM = 7. 1 ps Idler 2 TFWHM = 5. 1 ps Idler 4 TFWHM = 4 ps OAA - June 2004 - San Francisco

Pump Spectrum 10 no signal in Psin= -10 d. Bm 0 Psin= 0 d. Bm Power [d. Bm] -10 Psin = 5 d. Bm -20 -30 -40 -50 -60 Pump in -70 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 Wavelength [nm] OAA - June 2004 - San Francisco

Idler 1 Spectrum Power [d. Bm] 0 -10 -20 -30 -40 Psin= 0 d. Bm Psin= 5 d. Bm Psin= 10 d. Bm -50 -60 1531 1532 1533 1534 Psin = -20 d. Bm Psin= -15 d. Bm Psin = -10 d. Bm Psin= -5 d. Bm 1535 Wavelength [nm] 1536 1537 1538 1553 1554 1555 Signal Spectrum 0 -10 -20 -30 -40 -50 -60 1548 1549 1550 1551 1552 Wavelength [nm] OAA - June 2004 - San Francisco

Idler 2 Spectrum Power [d. Bm] 0 -10 -20 -30 -40 -60 1555 Psin = -20 d. Bm Psin= -15 d. Bm Psin = -10 d. Bm Psin= -5 d. Bm Psin= 0 d. Bm Psin= 5 d. Bm Psin= 10 d. Bm -50 1556 1557 1558 1559 Wavelength [nm] 1560 1561 1562 1563 Idler 4 Spectrum Psin= -10 d. Bm Psin = -5 d. Bm Psin= 0 d. Bm Psin= 5 d. Bm Psin= 10 d. Bm 0 Power [d. Bm] -10 -20 -30 -40 -50 -60 1562 1563 1564 1565 1567 1566 Wavelength [nm] 1568 1569 1570 1571 OAA - June 2004 - San Francisco

Pulse width and TBP vs. Input signal Power 8. 5 2. 4 signal pump idler 1 idler 2 idler 4 8 7. 5 2. 2 2 1. 8 TBP FWHM [ps] 7 1. 6 6. 5 1. 4 6 1. 2 5. 5 1 5 0. 8 4. 5 4 -20 0. 6 -15 -10 -5 0 input signal power [d. Bm] 5 10 0. 4 -20 -15 -10 -5 0 Input signal power [d. B] 5 10 OAA - June 2004 - San Francisco

Conclusions We have demonstrated a 40 GHz multi-wavelength pulse source using the saturation effect in OPA: § An OPA pumped by a sinusoidally modulated pump controlled by a 20 GHz RF source can be saturated by a single CW input signal § Generation of several orders FWM products , each being a 40 GHz pulse source § Under optimized condition the pulse width reduces with the increasing FWM order OAA - June 2004 - San Francisco

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