Simulation of Derivative Characteristics of Broadband Quantum Dot Lasers

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1 USOD 007 wark D Simuation of Drivativ Charactristics of Broadband Quantum Dot Lasrs C. L. an Y. Wan H. S. Di* B. S. Ooi Cntr for Optica chnoois and Dpartmnt of ctrica and Computr ninrin Lhih Univrsity Bthhm Pnnsyvania *prsnty with JDS Uniphas Corporation San Jos Caifornia Corrspondin author: Wbsit: Acknowdmnt: ationa Scinc Foundation (Grant o.: CCS )

2 Outin Introduction hortica Mod Simuation Rsuts Concusions

3 Introduction Appications of Broad Gain Matria & Broadband Lasr Optica communications Utra-broadband componnts tunab asr SOA A moduator dtctor tc Utra-short pus nration Optica cockin ODM tc Spctroscopy & Snsin Mocuar spctroscopy ( nm) Stron ovrton spctra of CO C H and H 3 Atmosphric and pantary as snsors CH 4 CO CO H S HC H 3 C H 4 C H C H 6 C 6 H 6 tc Gnra Spctroscopy Matria absorption transmission uminscnc tc Mtrooy Optica tst and masurmnts tc Optica tim domain rfctromtry (ODR) Imain Bio-imain (Optica Cohrnc omoraphy) Utra-short pus imain tc Othrs Hih snsitiv fibr yroscop Instrumntation tc

4 Introduction (con t) Broadband Liht Sourc chnooy xistin tchnoois: Photonic crysta fibr (PCF) Incandscnt amp Ampifid spontanous mission (AS) sourc Smiconductor broadband mittr: - Liht-mittin Diod (LD) & Supruminscnt Diods (SLD) - Broadband intrsub-band Quantum Cascad Lasr (QCL)

5 Introduction (con t) 1550nm Quantum-W Supruminscnt Diod (SLD): Prformanc: Bandwidth 60nm output powr >0mW chnooy transfr: Dnsiht Smiconductor Ltd. Sinapor I J. S. opics Quantum ctron. vo.8 p US Patnt rantd : 9 Sptmbr nm Quantum-W SLD Prformanc: Bandwidth: 65nm ripp:<0.1db chnooy transfr: Car Ziss Mditc Inc. I J. Quantum ctronics submittd 007 USA Patnt Appication submittd Octobr nm & 1600nm Quantum-Dot/Dash SLDs: 100nm SLD: Bandwidth: 135nm ripp: 0.3dB 10s μw 1600nm SLD: Bandwidth: 110 nm ripp: 0.3 db powr: mw I Photon.ch. Ltt. vo. 18 p J. of Crysta Growth vo.88 pp I Snsor Journa007

6 Introduction (con t) Intrsub-band cascad mid-ir Quantum band ninrin: - 36 diffrnt activ rions Covrin 6-8 µm mission Low wa-pu fficincy at R (<0.1%) Sid-mod-suprssion-ratio : ~0 db Matria chan for nar-ir rion! Gmach t a. atur (00).

7 Introduction (con t) Inhomonous QD Lar nry spacin DISCR-transition band Dua-stat asin action Markus t a. App. Phys. Ltt (003). Suawara t a. J. App. Phys (005). Hihy inhomonous QD arrow nry sparation QUASI-transition band Broadband intrband asr Di t a. Optics Lttrs 3 (007).

8 Introduction (con t) h cacuatd output powr shows siht variation with xprimnta masurmnt that may du to th cavin prcision of th dvic. h cacuatd inwidth match w with masurd data du to th optica ain broadnin. H. S. Di t a. Opt. Ltt (007). C. L. an t a. App. Phys. Ltt (007). C. L. an t a. (submittd to Computationa Matrias Sci.)

9 Introduction (con t) C. L. an t a. App. Phys. Ltt (007).

10 hortica Mod uw u wu w wr w i w q I dt d + = η Γ + + = m mn r u r u uw u u u u u u u wu n w u Sm n c G dt d. Γ + = Γ + = m m mn r r u u u m m mn r r u u u S n c dt d S n c dt d..

11 hortica Mod (con t) ) ( 1) ( 0 0 k m n n k r D mn B G P P m cn D q = σ ε π h n D G D P = ) ( ) ( / ) ( k m k m B Γ + Γ = h h π Γ = Δ D QD P D c k n [ ) ( σ h ] ) ( ) ( ) / ( 1) ( n G P Γ + h π Optica ain moda: Homonous Broadnin function: Kramrs-Kroni ration to Δn in QD nsmb: M. Suawara t a. Phys. Rv. B (000). M. Suawara t a. J. App. Phys (005). M. Gioannini t a. Opt. and Quantum ctron (006).

12 hortica Mod (con t) Contribution of fr carrirs in th wttin ayr to Δn: Δn WL = Γ WL K n Δ Linwidth nhancmnt Factor bow thrshod: WL 4π ( Δn α = λ + Δn G + Δn UC Δ / Δ + Δn WL ) / Δ Linwidth nhancmnt Factor abov thrshod: α = α QD + α QD G + ( α UC + α WL ) ρ th 1+ ρ ρ th th 1 J J th Y. oda t a. Phys. Rv. Ltt. 8 0 (1999). M. Gioannini t a. Opt. and Quantum c (006). S. Mnik t a. Opt. xp (006). Z. Mi t a. I J. Quan. c (007).

13 Simuation Rsuts h cacuatd apha of typica QD asrs (yp I) at bow and abov thrshod shows simiar trnd as rportd from itratur rviws. QD asrs with broadband natur (yp III) shows arr chan of apha abov thrshod in accordanc to inction as compard to typica QD asrs. his is du to th arr apha contribution from continuum stats in ar inhomonous systm as can b found from foowin fiurs. S. Mnik t a. Opt. xp (006). Z. Mi t a. I J. Quantum. ctron (007).

14 Simuation Rsuts (con t) Broadband QD asrs (yp III) shows a smar dr of chan ovr nry span as compard to typica QD asrs (yp I) from fiur. h arrows show th asin nry of ach systm. h up-arrow rfrs to yp I whi down-arrow rfrs to yp II and III. h LF of typica QD asrs shows vau bow nar thrshod. yp I J. Oksann t a. J. App. Phys (003). M. Gioannini t a. Opt. and Quantum c (006) S. Mnik t a. Opt. xp (006).

15 Simuation Rsuts (con t) yp I yp II ypica QD asrs show that apha contribution from continuum stats incras rapidy with inction as compard to apha contribution from xcitd and round stats. Hnc continuum stats show simiar bhavior of wttin ayr in th cacuation mod without continuum stats. Howvr broadband QD asrs show that apha contribution from continuum stats is th arst and affct th apha vau of th systm. yp III Z. Mi t a. I J. Quantum. ctron (007).

16 Simuation Rsuts (con t) h vau of diffrntia ain of typica QD asrs (yp I) shows simiar manitud of ordr as rportd so far. As inhomonity of th systm incras diffrntia ain at thrshod dcras as compard to typica QD asrs. Howvr th dcras of diffrntia ain is ss than 1x10-16 cm. Hnc th dr of moduation bandwidth of broadband asrs wi not b dradd too much from typica QD asrs. A. A. UKhanov t a. App. Phys. Ltt (004).

17 Concusions Drivativ charactristics of broadband QD asrs ar compard with typica QD asrs. A siht incras of inwidth nhancmnt factor at round stat of 0.8 is obsrvd in broadband QD asrs. A siht dcras of diffrntia ain of s than 1x10-16 cm at thrshod is obsrvd in broadband QD asrs. h comparab vaus of GS s LF in broadband QD asrs shows its comptncy in providin ow frquncy chirpin as w as a patform of monoithic intration for th GS opration.

18 hank You

19 Simuation paramtrs GS = 1050mV S = 1090mV D G = 1 D = 3 D U = 10 L ca = 800μm 0wu = 1ps 0u = 0 = 0u = 3.4ps n r = 3.5 r = 1ns D = 1.67*10 3 V A = 9.6*10-16 R 1 = R = 0.3 α i = 4.5cm -1 ß= 10-4 Γ QD = 0.03 wr = 0.4ns = 0.38ns 0uw = 10ps Γ WL = 0.01 Γ inhomo = 3mV 76mV Δ = 0.mV

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