Iec 61290 1 1 2015

IEC 61 290 1 1 Edition 3 0 201 5 05 INTERNATIONAL STANDARD Optical amplifiers – Test methods – Part 1 1 Power and gain parameters – Optical spectrum analyzer method IE C 6 1 2 9 0 1 1 2 0 1 5 0 5 (e n[.]

IEC 61 290-1 -1

Editio 3.0 2 15-0

Optical ampl fier s – T est methods –

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IEC 61 290-1 -1

Editio 3.0 2 15-0

Optical ampl fier s – Test methods –

Part 1-1: Power and gain parameters – Optical spectrum analyzer method

INT ERNAT IONAL

ELECT ROT ECHNICAL

®

Warnin ! Mak e s re th t you obtain d this publ c tion from a a thorize distributor

FOREWORD 3

1 Sco e 5

2 Normative referen es 5

3 Terms, definition an a breviation 5

3.1 Terms an definition 5

3.2 Ab reviation 5

4 Ap aratu 6

5 Test sample 8

6 Proced re 8

7 Calc lation 9

8 Test res lts 1

Biblogra h 12 Fig re 1 – Typical ar an ement of the o tical sp ctrum analy er test a p ratu for gain an p wer me s rements 6

INTERNATIONAL ELECTROTECHNICAL COMMISSION

Part 1-1: Power and gain parameters –

Optical spectrum analyzer method

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International Stan ard IEC 612 0-1-1 has b en pre ared by s bcommite 8 C: Fibre o tic

s stems an active devices, of IEC tec nical commite 8 : Fibre o tic

This third edition can els an re laces the secon edition publs ed in 2 0 an con titutes a

tec nical revision

This edition in lu es the fol owin sig ificant tec nical c an es with resp ct to the previou

edition:

a) updates on the c aracteristic of me s rement a p ratu ;

The text of this stan ard is b sed on the fol owin doc ments:

Ful information on the votin for the a proval of this stan ard can b fou d in the re ort on

votin in icated in the a ove ta le

This publ cation has b en draf ed in ac ordan e with the ISO/IEC Directives, Part 2

This stan ard s al b u ed in conju ction with IEC 612 0-1 an IEC 612 1-1

A l st of al p rts of the IEC 612 0 series, publ s ed u der the general title Op tical amp lifie rs –

Te st meth ds

1

can b fou d on the IEC we site

The commit e has decided that the contents of this publ cation wi remain u c an ed u ti

the sta i ty date in icated on the IEC we site u der "ht p:/we store.iec.c " in the data

related to the sp cific publ cation At this date, the publ cation wi b

• reconfirmed,

• with rawn,

• re laced by a revised edition, or

A bi n ual version of this publcation may b is ued at a later date

—————————

1

Th first e itio s of s me of th s p rts were p bls e u d r th g n ral title O ptcal fibre am plfiers – B asic

OPTICAL AMPLIFIERS – TEST METHODS –

Part 1-1: Power and gain parameters –

Optical spectrum analyzer method

This p rt of IEC 612 0 a pl es to al commercial y avai a le o tical ampl fiers (OAs) an

o tical y ampl fied mod les It a ples to OAs u in o tical y pump d fibres (OFAs b sed on

either rare-e rth do ed fibres or on the Raman ef ect , semicon u tor OAs (SOAs) an planar

o tical waveg ide ampl fiers (POWAs)

The o ject of this stan ard is to esta l s u iform req irements for ac urate an rela le

me s rements, by me n of the o tical sp ctrum analy er test method, of the fol owin OA

p rameters, as defined in IEC 612 1-1:

a) nominal output sig al p wer;

b) gain;

c) p larization-de en ent gain;

d) maximum output sig al p wer;

e) maximum total output p wer

NOT Al n meric l v lu s folowe b (‡) are s g e te v lu s for whic th me s reme t is a s re

The o ject of this stan ard is sp cifical y directed to sin le-c an el amplfiers For

multic an el ampl fiers, one s ould refer to the IEC 612 0-10 series [1]

2

The fol owin doc ments, in whole or in p rt, are normatively referen ed in this doc ment an

are in isp n a le for its a pl cation For dated referen es, only the edition cited a pl es For

u dated referen es, the latest edition of the referen ed doc ment (in lu in an

amen ments) a pl es

IEC 612 0-1, Optc l amplfie rs - Te st me tho ds - Part 1: Po we r and gain paramete rs

IEC 612 1-1, Optc l amplfie rs - Part 1: Ge e ric sp e c ific to

3 Terms, definitions and abbreviations

3.1 Terms a d definitio s

For the purp ses of this doc ment, the terms an definition given in IEC 612 1-1 a ply

3.2 Abbre iations

DBR distributed Brag reflector (laser diode)

DFB distributed fe d-b c (laser diode)

—————————

ECL external cavity laser (diode)

LED lg t emitin diode

OFA o tical fibre ampl fier

POWA planar o tical waveg ide amplfier

SOA semicon u tor o tical ampl fier

4 Apparatus

A diagram of the me s rement set up is given in Fig re 1

Figure 1a – Cal bratio

Figure 1b – In ut signal p wer me surement

Figure 1c – Outp t p wer me surement

Figure 1 – Typic l ar a g me t of the optic l spe trum

a alyzer te t ap aratus for gain a d power me s reme ts

The test eq ipment l sted b low, with the req ired c aracteristic , is ne ded

a) o ptc l source:

The o tical source s al b either at fixed wavelen th or wavelen th- u e ble

– fix d-wav le gth op tic al sourc e : This o tical source s al generate a l g t with a

wavelen th an o tical p wer sp cified in the relevant detai sp cification Unles

otherwise sp cified, the o tical source s al emit a contin ou wave with the ful width

at half maximum of the sp ctrum nar ower than 1 nm (‡) A distributed fe d-b c (DFB)

laser, a distributed Brag reflector (DBR) laser, an external cavity laser (ECL) diode

an a lg t emitin diode (LED) with a nar ow-b n fi ter are a pl ca le, for example

IE

Optic l

p wer

meter

Va a le

o tic l

ate u tor

dB Optic l

s ur ce

J1

Pola z tio

c ntr oler

(o tio al)

IE

Optic l

s e tr um

a naly er

Va a le

o tic l

ate u tor

dB Optic l

s ur ce

J1

J2

Pola z tio

c ntr oler

(o tio al)

IE

OA

u d r te t

Optic l

s e tr um

a aly er

Va a le

o tic l

ate u tor

dB Optic l

s ur ce

J1

OA

J2

Pola z tio

c ntr oler

(o tio al)

s al b hig er than 30 dB (‡) The output p wer flu tuation s al b les than 0,0 dB

(‡), whic may b b ter at aina le with an o tical isolator at the output p rt of the

o tical source Sp ctral bro denin at the fo t of the lasin sp ctrum s al b minimal

for laser sources an the ratio of the source p wer to total sp ntane u emis ion

p wer of the laser s al b more than 3 dB;

– wav le gth-u ne ab le op tic l source: This o tical source s al b a le to generate a

wavelen th- u a le l g t within the ran e sp cified in the relevant detai sp cification

Its o tical p wer s al b sp cified in the relevant detai sp cification Unles

otherwise sp cified, the o tical source s al emit a continuou wave with the ful width

at half maximum of the sp ctrum nar ower than 1 nm (‡) An ECL or an LED with a

nar ow b n p s o tical fiter is a pl ca le, for example The s p res ion ratio of side

modes for the ECL s al b hig er than 3 dB (‡) The output p wer flu tuation s al

b les than 0,0 dB, whic may b more e si y ataina le with an o tical isolator at

the output p rt of the o tical source Sp ctral bro denin at the fo t of the lasin

sp ctrum s al b minimal for the ECL Sp ctral bro denin at the fo t of the lasin

sp ctrum s al b minimal for laser sources an the ratio of the source p wer to total

sp ntane u emis ion p wer of the laser s al b more than 3 dB

The u e of an LED s al b l mited to smal -sig al gain me s rements

b) o ptc l p we r meter:

It s al have a me s rement u certainty b ter than ± ,2 dB, ir esp ctive of the state of

p larization, within the o erational wavelen th b n width of the OA A d namic ran e

ex e din the me s red gain is req ired (e.g 4 dB);

c) o ptc l sp ctru m analyzer:

Within the o erational wavelen th b n width of the OA, the l ne rity of the sp ctral p wer

me s rement s al b b t er than the desired gain u certainty an at most ± ,5 dB, an

the ampl tu e sta i ty of the sp ctral p wer me s rement s al b b ter than the desired

p wer u certainty an at least b ter than ±0,2 dB over the d ration of the me s rement

Polarization de en en e of the sp ctral p wer me s rement s al b b t er than ± ,5 dB

The wavelen th me s rement u certainty s al b b t er than ± ,5 nm A d namic ran e

ex e din the me s red gain is req ired (e.g 4 dB) The sp ctral resolution s al b

eq al or b t er than 1 nm;

d) o tc l isolato r:

Optical isolators may b u ed to brac et the OA The p larization-de en ent los variation

of the isolator s al b b ter than 0,2 dB (‡) Optical isolation s al b bet er than

4 dB (‡) The reflectan e from this device s al b smal er than – 0 dB (‡) at e c p rt;

e ) variable o ptc l ate u ator:

The aten ation ran e an sta i ty s al b over 4 dB (‡) an b ter than ± ,1 dB (‡),

resp ctively The reflectan e from this device s al b smal er than – 0 dB (‡) at e c p rt;

f) p olariz to n co trole r:

This device s al b a le to provide as input sig al l g t al p s ible states of p larization

(e.g l ne r, el ptical an circ lar) For example, the p larization control er may con ist of

a l ne r p larizer fol owed by an al - ibre- yp p larization controler, or by a l ne r

p larizer fol owed by a q arter-wave plate rotata le by minimum of 9 °, an a half wave

plate rotata le by minimum of 18 ° The los variation of the p larization control er s al

b les than 0,2 dB (‡) The reflectan e from this device s al b smal er than – 0 dB (‡)

at e c p rt The u e of a p larization control er is con idered o tional, ex e t for the

me s rement of p larization de en ent gain, but may also b neces ary to ac ieve the

desired u certainty of other p wer an gain p rameters for OA devices ex ibitin

sig ificant p larization de en ent gain;

g) o ptc l fibre jump rs:

The mode field diameter of the o tical fibre jump rs u ed s al b as close as p s ible to

that of fibres u ed as input an output p rts of the OA The reflectan e from this device

s al b smal er than – 0 dB (‡) at e c p rt, an the len th of the jump r s al b s orter

Stan ard o tical fibres typ B1 as defined in IEC 6 7 3-2-5 [2] are recommen ed

However, other fibre typ s may b u ed as inputoutput fibre In this case, typ of fibre wi

b con idered

h ) o ptc l co ne c to rs, J1 and J :

The con ection los re e ta i ty s al b b ter than ± ,2 dB

5 Test sample

The OA u der test s al o erate at nominal o eratin con ition If the OA is l kely to cau e

laser os i ation d e to u wanted reflection , o tical isolators s al b u ed to brac et the

OA u der test This wi minimize the sig al in ta i ty an the me s rement u certainty

For me s rements of the p rameters of Clau e 1, care s al b taken in maintainin the state

of p larization of the input l g t d rin the me s rement Chan es in the p larization state of

the input l g t may res lt in input o tical p wer c an es b cau e of the slg t p larization

de en en y exp cted from al the o tical comp nents u ed, this le din to me s rement

er ors

The proced re is as fol ows:

a) G ain and nominal ou tp u t sig al po wer:

This method p rmits determination of the gain throu h the me s rements of the OA input

sig al p wer, P

in , the OA output p wer, P

o t

an the OA amplfied sp ntane u emis ion

AS

at the sig al wavelen th The me s rement proced res des rib d

b low s al b folowed:

1) set the o tical source at the test wavelen th sp cified in the relevant detai

sp cification Set the o tical source an the varia le o tical at en ator in a way to

provide, at the input p rt of the OA, the o tical p wer P

in

sp cified in the relevant

detai sp cification;

2) me s re P

in

with the o tical p wer meter, as s own in Fig re 1a, to cal brate the

o tical sp ctrum analy er;

3) me s re P

in

with the o tical sp ctrum analy er, as s own in Fig re 1b;

4) me s re P

o t

with the o tical sp ctrum analy er, as s own in Fig re 1c;

5) me s re P

AS

with the o tical sp ctrum analy er, as s own in Fig re 1c, ac ordin to

the tec niq e sp cified in the relevant detai sp cification;

In cases u in a p larization control er, the fol owin proced re s al b u ed:

6) me s re P

o t

by adju tin the p larization control er u ti a minimum P

o t

is ac ieved

an re e t ste 5)

Variou tec niq es for P

AS

me s rements are a pl ca le One tec niq e makes u e of

an interp lation proced re to evaluate the ASE level at the sig al wavelen th by

me s rin the ASE level at wavelen th of set to b th side of sig al wavelen th on the

o tical sp ctrum analy er display Another tec niq e employ a p larizer, placed b twe n

the varia le o tical aten ator an the OA u der test, to el minate the sig al comp nent

from the OA output to me s re the ASE level without b in af ected by the ampl fied

sig al sp ctrum In the lat er case, the input o tical sig al s al b l ne rly p larized with

an extin tion ratio b t er than 3 dB (‡), an P

o t

s al b calc lated as an averaged value

overal the p larization states If the p larizer tec niq e can ot s f iciently elminate the

sig al p wer, the interp lation tec niq e can b u ed in ad ition to the p larizer tec niq e

Optical con ectors J1 an J2 s al not b removed d rin the me s rement to avoid

me s rement er ors d e to re-con ection