ȓǤǦǓɓɭʀȴɱɁ♠ಐӟɝȩȬɘ⢡Ј⾷1⾸গ૓⦖Ό⢌ȿɁɎɨ᧸ӟɝȩȬɘǽᗢ⫧ոᄃǷǬǽ֝൧ጋ೙Ή᰷ɝɀȷɱӟ⯍੿ཪ⒈ᮾ᳣ཀ

ࣦ ❟⮤ ‫ٺ‬

Optical ˆber communications [I]Control of chromatic dispersion of optical ˆber for high capacitytransmission system
Masahiro Horikoshi
Fujikura Ltd. Optics and Electronics Laboratory㑭.

ǾǧȐǺǽ֝൧⾻іᗢոᄃǽཱ֝⾻ӟકⰞἠബ‫׼‬እǽཱ֝ǛᣀǺᕷȐȘțǵǓȚƹǢǢǶǾগ૓⦖Ό⢌Ȭɻɇʀɕɋɐǽᇃ‫ڽ‬ǷံϜǤțȚȽʀɛɁȿɁɎɨ᧸ӟɝȩȬɘǺǙǠȚ⦔┶ǹ┶ᕷᣀමǽɞɵʀɑɘɻɑ‫ك‬ǽ⢳ୠǺȗș⾻ሬ⡨ǶǾӟǽʶǳǶǑȚӟɝȩȬɘǽᗢ⫧ոᄃǷǬǽ֝൧ɝȩȬɘȡ᧸ǓǮ 100 Mbps ౺ేࣕȽʀɛɁǽǺǳǓǵ⡻ȈȚƹံϜǛ⫳਀ǤțȚǹǸ⾻ӟɝȩȬɘ⢡ЈǾȍǤǺ⟘⡨ǹȑǽǺǹǲǵǓȚƹǬǦǵ⾻ǢțǺଓඅǨȚɕɋɐɷʀȷȇǽগ૓⦖‫ك‬ǽ┶ᕷȑⶲȍșȡ╀ǪǵǓȚƹǬǽʶᅀǶӟ⢡ЈȿɁɎɨ㑮.

ȿɻȸɳɪʀɑӟɝȩȬɘǽᗢ⫧ոᄃǾ⾻Ǣǽᄋ౫⫻ǺǙǓǵ⾻ᗢ⫧ոׂএ⦔ӟɝȩȬɘ⢡ЈǺǙǓǵ⾻ӟɝȩȬɘǺӱଙ

⾷WDM: Wavelength Division Multiplexing⾸ᅀǤțǮӟЈ‫ۥ‬əɳɁǾ⾻ӟᛠǽɁɢȷɐɳౙ⾻೙ȡ˛ൺǷǦǮগ૓⦖‫ك‬Ǻ⬄ǨȚ⫳᫘ǷଣӱǛɝȩȬɘቦᄦǽ୓ླྀ᤹ոᄃ⾻ӟɝȩȬɘǽ୓ླྀᘍ᫘Ǻ⒅ȞțǵǜǮƹǢǽᐯǹগ૓⦖Ό⢌ȿɁ᤹ոళǹǸǺȗǲǵᖑȍȚȁǩȎȡ‫ۅ‬Ǡ⾻ӟЈɎɨǺΌ⢌➇ǷǦǵ᧸ǓȘțȚӟɝȩȬɘǶ‫ۥ‬ᗢബǽౙǛ౺ǛǲǵǦȍǓ⾻Ǣǽ‫׼‬እǺȗǲǾ⾻ᗢ⫧এ⦔‫ك‬ǺȗȚΌ⢌ᗢ⫧ࣕǽ౺ǛșǙȗǵ⢡Јἠ➇ǷǦǵǽሬⶲΌ⢌⢦ಏǛᖑ઻ǤțȂӱ‫מ‬ӟəɷʀǽऻগᵱǺǷȑǹǓ⾻ᗢ⫧ոᄃȚƹǢǽӟЈ‫ۥ‬ᗢബǽ౺ǛșȡȑǮȘǨ‫׼‬እȡ

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E-mail: hori⿏lab.fujikura.co.jp48ἕᲠǦǵոᄃǷܵȢǶǓȚ1)ƹȿɻȸɳɪʀɑӟɝȩȬɘǺǙǠȚոᄃǾ⾻ቦᄦոᄃ⾻ଣᗢ➇ոᄃ⾻іᗢոᄃǽ 3 ┶ࡍǛ‬ǗȘțȚƹǢǽԑ⾻ቦᄦոᄃǷଣᗢ➇ոᄃǾᗢ⫧ϞઇමȡᰳǨ

NEW GLASS Vol. 17 No. 2 2002ǢǷǚȘ⾻˓‫‮‬ȡ۰ȞǪǵᗢ⫧ոᄃ s ǷȑܵǜǮƹǢǽᐯǹȿɁɎɨǶǾΌ⢌⢦ಏǛⶲ⢦ǺǿțǵǙș⾻ᓎ೙2)ǶᰳǤțȚƹǹȚǺǳțǵӟɝȩȬɘǽոᄃǛުⲤǷǹȚǮs⿌sm⾺sw⿌

l d 2nl
1
⾺c d 2l 2 p 2c n( )d l( 1)
21 dl w

ǢǢǶ⾻ sm Ǿቦᄦոᄃ⾻ sw Ǿଣᗢ➇ոᄃȐ⾻Ό⢌᧸ӟɝȩȬɘǾ⾻π᧸ᗢ⫧Ƕǽᗢ⫧ոᄃǛȊȋ⯈ǷǨȚǢǷǛർ┶ǶǑȚƹ 1.3 mm
ే ȿ ɻ ȸ ɳ ɪ ʀ ɑ ɝ ȩ Ȭ ɘ ⾷ SMF: Single-

ȡ⒙Ǧ⾻l Ǿᗢ⫧⾻c Ǿӟ⢦⾻n1 ǾӟɝȩȬɘ

Mode Fiber⾸Ǿ⾻‫ٸ‬ẗǹ⭵ᔲࢪ୓ླྀ᤹ոళǶ⾻ǽȻȪǽ୓ླྀ᤹⾻ w Ǿɪʀɑɝȫʀɳɑ٪ൎࡖ 1a)ǺᰳǤțȚᐯǺᗢ⫧ոᄃǛ⯈ǺǹȚᗢ⫧ǶǑȚƹ⾷⯈ոᄃᗢ⫧⾸Ǜ⾻ȊȋቦᄦոᄃǛ⯈ǷǹȚቦᄦոᄃǾ⾻ӟǽᗢ⫧ং‫ك‬ǺȗȚӟɝȩȬɘ

1.3 mm ͛⡨ǺǹǲǵǓȚƹǬǽൖ⾻ӟɝȩȬቦᄦǽ୓ླྀ᤹ং‫ك‬ǺǷȑǹǲǵЈ‫ۥ‬ӟǽ῭⢦ಏɘǽሬ΢၏ডᗢ⫧ࣕǶǑȚ 1.5 mm ేȡ֐᧸ǨǛং‫ك‬Ǧ⾻ǬțǷӟᛠǽɁɢȷɐɳǽ౺ǛșǛȚ Ǯ Ȑ Ǻ 1.5 mm ే ⯈ ո ᄃ ȿ ɝ ɐ ӟ ɝ ȩ Ȭ ɘǑǓȍǲǵ᧯ǧȚոᄃǶǑș⾻ቦᄦǶǑȚȴɱ

⾷DSF: Dispersion Shift ˆber⾸Ǜ⫳᫘ǤțǮƹɁǽ୓ླྀ᤹ոᄃǚȘᕷȐȚǢǷǛլቻȚƹ୓ླྀ

1.5 mm ేȇ⯈ոᄃᗢ⫧ȡȿɝɐǤǪȚǺǾ⾻᤹ոᄃȡ⒙ǨȑǽǷǦǵ Sellmeier ǽএⱼ೙ǛόǗǿࡖ 1b)ǽᐯǺ⭵ᔲࢪ୓ླྀ᤹ոళǶȑȻȪ᮪ȘțǵǙș⾻ᥰࢀ⢡Ј᧸ӟɝȩȬɘǽቦᄦǷൎȡତǤǞǦǵȻȪǷȷɱɋɑǽ୓ླྀ᤹ఞ⾷ᕉǦǵ˩Ǻ᧸ǓȘțǵǓȚ᮸⇠‫ڽ‬ȂȺɳɦɓȪ୓ླྀ᤹ఞ⾸ȡগǜǞǨȚǢǷǶȑ‫⃆۝‬ǶǾǑȚɑʀɟ᮸⇠ǺǳǓǵ۬ϭᄋǛᕷȐȘțǵǓǛ⾻ɪʀɑɝȫʀɳɑൎǛତǤǞӟɝȩȬɘǽȚ3),4)ƹǹǙ⾻᮸⇠ṾӟȿɻȸɳɪʀɑӟɝȩယỮᵱǺ⬄Ǧǵી᧸᫢ǶǹǓƹǢǽᣀමȡȑᛙȬɘǽቦᄦոᄃǾ⾻ᗢ⫧ǽ‫ٸ‬Ρȡ mm ǷǦǮǙ❣ǨȚȗǕǹ୓ླྀ᤹ոళബᣞǛᎰ╿Ǥț⾻ɏɭǙȍǚǹ⡨ΚǶǾ⾻Ȋȋӽ⢡ǺͨˁǽȗǕǺ⒙ȪɳȿȯȬɟࢪȓɃȸɩɻɐȻȪࢪ୓ླྀ᤹ոళǪȚ5)ƹ

ǽ DSF Ǜી᧸‫ك‬ǤțǵǓȚƹ

(l⾼l1.3)j120 ps/km/nm (2)sm⿌ଣᗢ➇ոᄃǾ⾻ӟɝȩȬɘ˛ȡΌၡǨȚɪʀɑǽ౺ǛșǛᗢ⫧ǽং‫ك‬Ǻȗǲǵং‫ك‬Ǧ⾻ǢțǛӟɝȩȬɘǽ୓ླྀ᤹ոళ⾷ଣᗢ➇ᐦ⢧⾸ǺϞઇǦǵ᧯ǧȚոᄃǶǑȚƹ㑯.

ᗢ⫧এ⦔Ό⢌ȿɁɎɨ᧸ӟɝȩȬɘǷ⓹۰Ό⢌➇ӟ⢡ЈȿɁɎɨǽগ૓⦖‫ك‬ǺଓඅǨȚȑǕʶᅀǽཆᗕǷǦǵ⓹ᄋᗢ⫧ǽӟЈ‫ۥ‬ȡΌ⢌ǨȚȍǮіᗢոᄃǾ⾻ȿɻȸɳɪʀɑӟɝȩȬɘ

WDM ᅀ೙ǛǑș⾻ǢǢᄋ౫⫻ǺȿɁɎɨǽǽȻȪǽཁ౪⾻ɝȩȬɘǺᔞ᨞ǨȚȞǩǚǹᔁ⫳᫘‫ڽ‬ȂଣӱǛᘍ᫘Ǻ⒅ȞțǵǜǮƹ WDMȎȓঋ‫מ‬ȗǲǵ᧯ǧǮᨵᅀමǺȗș⾻ᥴ็᫢ǺȿɁɎɨǺǙǓǵΌ⢌ᣀමȡ‫كצ‬ǤǪȚ┶ࡍǽǾὗ⢋ǦǵǓȚᬼ̰̘іᗢǛ⾻ǑǮǚȑ 2ʶǳǺ⾻ӟɝȩȬɘǺӱଙǤțȚӟəɷʀǽऻɪʀɑǷǦǵ࿑ȚⅵǕǢǷǺȗǲǵ᧯ǧȚոᄃগǺǷȑǹǕӟɝȩȬɘ˛ǶǽӟકⰞἠബ‫׼‬እǶǑȚƹǹǙіᗢոᄃǾ⾻⢡౐ˀ▉̘ǳǽոᄃǛǑș⾻ӟɝȩȬɘǽ⯈ոᄃᗢ⫧͛⡨ǶǾ⾻ࡈǷᕉ⟿ǨȚǷତǤǓǮȐ⾻ȿɻȸɳɪʀɑӟӟᗢᚆ۰⾷FWM: Four Wave Mixing⾸Ǜⲩ⊣ɝȩȬɘǽéոᄃêǷǓǕई۰Ǿ⾻ᗢ⫧ոᄃȡǷǹȚƹǢǽ FWM Ǿ⾻Ό⢌Ј‫ۥ‬ӟǽəɷʀǤǨǢǷǛএǓƹ૛ಏǺᕉόǦǵӟɝȩȬɘȴɱɁǽⰞἠബ୓ླྀ൝ቻǽӟ⢡ЈȿɁɎɨǾ⾻‫ٸ‬ʶᗢ⫧ǽЈ‫ۥ‬ȡ᤹ǛȞǩǚǺং‫ك‬ǨȚǢǷǺ❙ࡍǦ⾻ᗢ⫧ǽᨵΌ⢌ǨȚȿɁɎɨǛ˩ǶǑș⾻Ј‫ۥ‬ӟǽⶲ⢦‫ك‬ǹȚЈ‫ۥ‬ӟ⫻Ƕᭀ̞ΰ᧸Ǜ᧯ǧ⾻Ј‫ۥ‬ӟᗢബǺǶǑȚᆣոׂএ⦔⾷TDM: Time Division Mul-ȁǩȎȓ⮰Ɱȡ᫘᧯ǤǪȚᥰ⛅ǶǑȚ6)ƹ൝ǲtiplexing⾸ᅀ೙Ǻȗǲǵগ૓⦖‫ك‬Ǜ⢳ȐȘțǵǵ FWM ȡཱ֝ǨȚǺǾ⾻Ό⢌ᗢ⫧ేǺǙǠ49

NEW GLASS Vol. 17 No. 2 2002ࡖ㑭 ȿɻȸɳɪʀɑɝȩȬɘǽᗢ⫧ոᄃȚӟɝȩȬɘǽᗢ⫧ոᄃȡ⯈ǶǾǹǞ⾻ǑȚᲦǶ WDM Ό⢌Ǜ‫⃆۝‬ǷǹȚȗǕǺ▚╹ǤțǵಏǽոᄃоȡሱǨȚӟɝȩȬɘǷǦǵ⾻FWMǓȚ7)ƹ

ǽ᫘᧯‫᤹׼‬ȡ΢᚛ǤǪȚᅀᗕǛሱ‫׼‬ǷǹȚƹǢ൝ ቻ ǽ SMF ȑ 1550 nm ే Ǻ ⯈ ո ᄃ ᗢ ⫧ ǛǽᐯǹӟɝȩȬɘǛ⾻ɖɻɄɵոᄃȿɝɐɝȩǹǞ⾻ી‫׼‬ȻȪᄺⰢ᳒ AeŠ Ǜẇ 80 mm2 ǷগǜȬɘ⾷NZDSF: Non-Zero Dispersion ShiftedǓǢǷǚȘ WDM Ό⢌Ǻ᧸ǓȚǢǷǛ‫⃆۝‬Ƕ

Fiber ⾸ǷܵǿțǵǓȚӟɝȩȬɘǶǑȚƹǢ

ǑȚƹᣀǺ 1260 」 1625 nm ǺȞǮȚ౺Ǔᗢ⫧ǽոᄃоǾ⾻Ό⢌⢦ಏ⾻ᗢ⫧⫻⭷ᵱǽ WDM

ࣕǶ⾻20 nm ᲦಏǽéḮǓêᗢ⫧⫻⭷Ƕᗢ⫧এȿɁɎɨǽቷͲǺϞઇǦǵং‫ك‬ǨȚǮȐ⾻ᲷƼ⦔ ȡ ⒅ Ǖ WDM ȿ Ɂ Ɏ ɨ ⾷ CWDM:ǽɇȬɟǽӟɝȩȬɘǛ⫳᫘ǤțǵǓȚƹ

Wavelength Division Multiplexing)8)ȡ‫⃆۝‬ǷCoarseɩɐɵṾǷȑܵǿțȚ 200 km ᲦಏȍǶǽ˛ǨȚǮȐǺ⾻൝ቻ OH ࣠‫ہ܋‬၏ডǛᕉ⟿᫢গ❹ ⮼ WDM ȿ Ɂ Ɏ ɨ ᧸ Ƿ Ǧ ǵ ⫳ ᫘ Ǥ ț ǮǜǞπ᧸˃‫⃆۝‬ǶǑǲǮ 1.38 mm ేǽ၏ডȡ

NZDSF ǽᗢ⫧ոᄃǽʶόȡࡖ 2 ǺᰳǨƹǢǽ΢᚛ǦǮ SMF ǛံጣǤțǵǓȚ9) ƹȍǮ⾻ǢӟɝȩȬɘǾ⾻ǢțȍǶǽ WDM ȿɁɎɨǺǽӟɝȩȬɘǾ⾻ᕮảǺȗȚ 1.38 mm ేǽ၏ǙǓǵ˩Ǻ᧸ǓȘțǵǜǮᗢ⫧ⲏࣕǶǑȚ Cডऻ‫ף‬ȑ൝ቻǽȑǽǷ⟿Ȉǵ΢᚛ǤțǵǓȚǢ

ɘɻɑ⾷1530」1565 nm⾸ǽȎǹȘǩ⾻S ɘɻǷ ȑᣀ ൰ ǶǑ Ț ƹ ǹǙ SMF ǽ 1550 nm Ǻ Ǚɑ⾷1460」1530 nm⾸ȡȑ‫܅‬ȐǮ౺Ǔᗢ⫧ⲏࣕǠȚᗢ⫧ոᄃоǾ⾻ẇ 17 ps /km /nm ǶǑș⾻50

NEW GLASS Vol. 17 No. 2 2002ࡖ㑮 ˛❹⮼ WDM ȿɁɎɨ᧸ӟɝȩȬɘ

NZDSF ǷᕉȈȚǷগǜǓƹǢǽǮȐ⾻ WDM⣕༔ǨȚǮȐǺ⾻ոᄃᣀමǛ⢡౐ǽ SMF ǷȊȿɁɎɨǺ᧸ǓȚई۰Ǿ⾻ǢǽոᄃоȡⓝӈǨȋ۴ᵱǶ⾻ɁɎɋɟࢪȓɏɟɴɁɐȷɱɋɑࢪȚոᄃⓝӈɝȩȬɘ⾷DCF: Dispersion Com-Ƕ୓ླྀ᤹ոళǽሬ⣪‫ك‬ȡ⒅Ǔ⾻ી‫׼‬ᄺⰢ᳒ȡǤ

pensation Fiber⾸ǷẻȎ۰ȞǪǵΌ⢌ἠ➇ȡᐦȘǺྮগǦǮӟɝȩȬɘ⾷EEPDF:Enlarged༔ǨȚǢǷǺȗș⾻ӟકⰞἠബ‫׼‬እȡཱࡿǦ⾻

EŠective erea Positive Dispersion Fiber⾸ǷոǚǳΌ⢌ἠ➇ӴΧǽᗢ⫧ոᄃȡତǤǞǦǮΌ⢌ᄃɁɵʀɟⓝӈࢪոᄃⓝӈɝȩȬɘ⾷SCDCF:➇ȡીᥰǨȚǢǷǛ‫⃆۝‬ǷǹȚƹ DCF Ǿ⾻গSlope Compensating and Dispersion Compen-ǜǹ⛤ǽᗢ⫧ոᄃȡ྾ǲǮӟɝȩȬɘǶ⾻⯈ոsationFiber ⾸ȡẻȎ۰ȞǪǮ⓹۰Ό⢌ἠ➇Ǜᄃᗢ⫧ȡ 1550 nm ͨˀǺǨȚǮȐǺȻȪൎȡံጣǤț⾻⫳᫘ǽ˩ᘓǷǹǲǵǓȚ10)」12) ƹତǤǞ⾻ᕉ୓ླྀ᤹ఞȡগǜǞǨȚǢǷǶીᥰǦSCDCF Ǿ⾻গǜǹ⛤ǽᗢ⫧ոᄃǷ⛤ǽոᄃɁǵǓȚƹɵʀɟȡ྾ǲǮɝȩȬɘǶǑȚƹǢǽᐯǹ⓹۰ӟᘬಃȿɁɎɨǽȗǕǹ⫧❹⮼ WDM ȿɁΌ⢌ἠ➇ǽόȡࡖ 3 ǺᰳǨƹἠ➇ǽ֭٪Ǻ AeŠɎɨ᧸ǽΌ⢌ἠ➇ǶǾ⾻ӟકⰞἠബ‫׼‬እǽ΢᚛ǽগǜǹ EEPDF ȡ᧸ǓǵӟકⰞἠബ‫׼‬እȡ΢ǷǷȑǺЈ‫كצۥ‬ǺǳǹǛȚᔞ᨞ոᄃȡ΢᚛Ǩ᚛Ǧ⾻ൖ٪Ƕ֭٪ǽɝȩȬɘǽᗢ⫧ոᄃǷոᄃȚǢǷǛ‫ڴ‬ǦǞ┶ᕷǤțȚƹӟકⰞἠബ‫׼‬እȡɁɵʀɟȡⓝӈǨȚǢǷǺȗǲǵ⾻౺Ǔᗢ⫧ే΢᚛ǨȚǮȐǺ AeŠ ȡগǜǞǦǮ NZDSF Ǜ⫳Ǻᚡǲǵᗢ⫧ոᄃǛ⯈Ǻ⡨ǓоǷǹȚἠ➇ȡી᫘ǤțǵǙș⾻⫧❹⮼Ό⢌ȿɁɎɨǷǦǵ⾻֭ᥰǨȚǢǷǛ‫⃆۝‬ǷǹȚƹ٪ǺǢǽ AeŠ ྮগ NZDSF ȡ᧸Ǔ⾻ൖ٪ǺոᄃɁɵʀɟȡ΢ǞཱǗǮ NZDSF ȡ᧸ǓǮ⓹۰ἠ➇Ǜ˩ᘓǷǹǲǵǓȚƹǦǚǦ⾻ǢǽᐯǹẻȎ㑰.

ȍǷȐ۰ȞǪǶȑΌ⢌ᗢ⫧ࣕǽᴻ⤴ǶǾ⾻⫧❹⮼Ό⢌গ૓⦖ӟ⢡ЈȿɁɎɨǺΌ⢌᧸ӟɝȩȬɘǺǦǮ⭾ǺոᄃɁɵʀɟǺȗǲǵẪ᳒ǤțȚᔞ᨞ǙǠȚ⦔┶ǹ┶ᕷᣀමǽʶǳǶǑȚᗢ⫧ոᄃǷոᄃǛগǜǞǹș⾻Ј‫كצۥ‬Ǜ⤀ǠȘțǹǓƹǬǽ֝൧ǺǳǓǵ⡻ȈǵǜǮǛ⾻ሬ⡨ǶǾ⾻1ǢǽᐯǹުⲤȡ╫ᖑǦǵ⾻ǤȘǹȚগ૓⦖‫ك‬ȡᗢ⫧ഝǮș 40 Gbit/s ͨˀǽᆣոׂⶲ⢦Ό⢌ཪ51

NEW GLASS Vol. 17 No. 2 2002

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