QWI-based ICs for EDFA pump lasers

News Update

Latest developments in Raman amplification F u r u k a w a s }TILL T e c h n o l o g k ~

A g e r e S y s t e m s (Breinigsvitle,

(Clinton, ~l, USA) has o p e n e d it

PA. 1 SA) - lormerlv t h e

->

12,000 ft- 1 ) e v e l o p m e n t C e n t e r

Microelectronics (;rotlp of

QWI-based ICs for EDFA pump lasers

in Warwick, RI, USA ( e m p h ) y i n g

I,tlcent T e c h n o l o g i e s - h a s

a b o n t I11 staff) for tile R&D of

l a u n c h e d an L-band l{anlan

n e x t - g e n e r a t i o n EI)FAs and

pun~p n]odule. It is i n t e n d e d R)r

R a m a n amplifiers (in c o n j u n c -

use w i t h EI)FAs (either cxter-

up I n t e n s e P h o t o n i c s

tion w i t h its affiliate Opt{gain

nalh' or physic'till integrated ,Is

((;lasgm~, Scotland. t K ) is to

part of t h e pre-amplifier section

d e m o n s t r a t e its q u a n t t u n well

l n c of Peace Dale, R1, { !SA). "By focusing (Ill Ranlan technologies, w e ' r e p r o v i d i n g o u r c u s t o m e r s with a flexible solution to e x p a n d existing networks", says Raja Parvcz, presid e n t of Opt{gain and tile n e w d e v e l o p m e n t lhcility.

of an EI)FA) to il'nprove signal perlormancc and lengthen

Monolithic p h o t o n i c s IC s t a r t

intermixing process (developed ()xer

n l o r e t h a n a d e c a d e at t h e

t r a n s m i s s i o n dist:mces of ter-

llniversity of Glasgow) with

abits of data betx~een

Q W l - b a s e d ICs R~r existing

repeaters. P r o d u c t i o n quantities

I)WDM applicati(ms, starting

are e x p e c t e d in (,)3/2OO1,

with 980 nnl H)FA p u m p lasers

C-band m o d u l e s will also be

(to be h m n c h e d in late 2001 ).

available. Agere is also oflk~ring

T h e QWI p r o c e s s allows multi-

Fitel has l a u n c h e d a flfll suite of

,t n e w COlnpatible, dynan]ic

l~unctiotl d e v i c e s to bc labricat-

t e c h n o l o g i e s to s u p p o r t R a m a n

gain equalization filter.

cd w i t h o u t using statldard

"['he m o d u l e c o m b i n e s nlultiple

l e c h n i q n e s t e c h n i q u e s and

lnP-based I t x x n m p u m p lasers

i m p r o v e s p c r f o r n l a n e e and

( l l l a d c ill VOlL|ll/e u s i n g a c c , nl-

viekl.

i l i o n a t l t o m a t e d l a s e r [ll,nltlJ~lc-

By i n c o r p o r a t i n g n o n - a b s o r b -

amplification, including 14xx n m p u m p lasers w h i c h s u p p l y t h e qOt) m W optical o u t p u t p o w e r n e e d e d R)r signal amplification within tile fibre, Samples mod-

turing platfl)rm) integrated in

ing m i r r o r s t r u c t u r e s o n

tile s,unc p a c k a g e as a range o f

d e v i c e l ) c e t s (to b o o s t optical

R a m a n :mll)lification requires

passive optical c o m p o n e n t s

p o w e r a n d reliabilit} by min-

t h e use of p o w e r f u l p u m p

( i n c l u d i n g taps, isolators and

inlising c a t a s t r o p h i c optical

m o d u l e s to create amplification

c o m b i n e r s , w h i c h arc m a d e

m i r r o r danlJ.ge), I n t e n s e

a l o n g tile core of tile tntnsnlis-

u s i n g in-house thin-fihn filter

P h o t o n i c s h a s l,lbricatcd F,DFA

sion fibre, with t h e p u m p emis-

t e c h n o l o g y acquired last ~ear

p u n l p lasers in t h e lab w h i c h

sion f u s e d v d t h tile laser-

from H e r r n l a n n ] k c h n o l o g } ).

o f l ) r p o w e r s of u p to ~()O m W

ules will be available in J u n e .

l a u n c h e d line signal.The Ram;m dispersion p r o c e s s links the two different w a v d e n g t h s within the fibre core, transferring t h e e n e p gy from t h e Iower-vvavelength p h o t o n to tile longer-wavelength

p h o t o n . T h i s p h e n o m e n o n h.'ts a non-linear effect p r o p o r t i o n a l to t h e p o w e r density in the fibre. C o m p a r e d to e r b i u m * d o p e d

A i e a t d O p t r o n i c s ( Paris. Fnmce) has launched

a

- a h n o s t dotlble c u r r e n t conln]ercial p r o d u c t s . T h e novel

complete

R a m a n anq~lification p r o d u c t line k)r all t y p e s o f c u r r e n t single-mode fibre o f h i g h - s p e e d (Tb/s) terrestrial m e t r o p o l i t a n . long-haul a n d ultraqong-haul I)WI)M t r a n s m i s s i o n systcnts.

d e s i g n is e x p e c t e d to redtlce t h e cost <)f n l a n t l ( a c t t l r i n g H)FA gain m o d u l e s , a n d supp o r t tile e x t e n s i o n of optical n e t w o r k i n g into metro markets. QWI t e c h n o l o g y h a s already

T h e line includes:

becll u s e d to c r e a t e n l t l n y discrete a n d n l u l t i p l e - f u n c t i o n

fibre amplifiers (EI)FAs), R a m a n

• tile 3t)1t m\V 1943 RAP Raman

,'tmplification r e d u c e s tile n o i s e

amplification p u m p ntodulc (li)r

inonolithic conlponcnts

figure, offering a flexible gain

1390-1S 10 n m S. C and I. bands):

( i n c l u d i n g lasers, SOAs,

profile a n d e n h a n c i n g gain flatn e s s . T h i s enables higher chantie] coutltS, taster t r a n s m i s s i o n

s p e e d s and h m g e r d i s t a n c e s b e t w e e n r e g e n e r a t i o n sites for

filters a n d s w i t c h e s ) . • tile C-band 1922 ()FA and tile

p r o v i d i n g a p l a t f o r m for

b b a n d 1932 ()FA Ran]an optical

I)~'I)M t r a n s m i s s i o n s y s t e m s .

amplifier s u b s y s t e m s : w h i c h

routers and switches.

can be u s e d x~ittl the I n t e n s e P h o t o n i c s is s u p p o r t e d

system manufacturers,This cuts

• 8t)(t m\V 19{8 MPM Raman

ovenllI s y s t e m c o s t s d u e to t h e

n m l t i - p u m p Tnodul¢ ( w h i c h

p e n d e n t c o m p o u n d semic()n-

r e d u c t i o n in in-line e q u i p m e n t ,

c o n t a i n s all electronic ftlnction

d u c t o r fimndry.

especially R~r high-speed ( 1 0

to

and 40 Gb/s) m m s m i s s i o n ,

bility),

by an alliance w i t h an inde-

control its len]perature sta-

tlI-Vs REVIEW

VOL 14 - NO 3 "April 2oo~