Optical waveguides – Optical fiber waveguide with cladding
Patent
1997-06-05
1999-03-02
Ullah, Akm E.
Optical waveguides
Optical fiber waveguide with cladding
G02B 602
Patent
active
058781820
ABSTRACT:
An optical fiber is disclosed that is suitable for use in wave-division-multiplex (WDM) systems served by Erbium-doped fiber amplifiers. The fiber has a chromatic dispersion whose absolute magnitude is at least 0.8 ps/(nm-km) over the wavelength region 1530-1565 nm, and has a dispersion slope that is less than 0.05 ps/(nm.sup.2 -km). This optical fiber exhibits a loss that is less than about 0.20 dB/km and is relatively insensitive to bending; moreover, its effective area exceeds 50 .mu.m.sup.2. The optical fiber includes a core of transparent material having a maximum refractive index n.sub.1, and a layer of transparent cladding material on the outer surface of said core having a refractive index n.sub.2. The core includes an annular region of transparent material whose minimum refractive index, n.sub.3, is depressed with respect to n.sub.2. These indexes are constrained by the following equations: 0.50<(n.sub.1 -n.sub.2)
.sub.2 <0.70; and -0.30<(n.sub.3 -n.sub.2)
.sub.2 <-0.05.
REFERENCES:
patent: 4372647 (1983-02-01), Okamoto et al.
patent: 4435040 (1984-03-01), Cohen et al.
patent: 4439007 (1984-03-01), Lazay et al.
patent: 4447127 (1984-05-01), Cohen et al.
patent: 4691991 (1987-09-01), Unger
patent: 4715679 (1987-12-01), Bhagavatula
patent: 4852968 (1989-08-01), Reed
patent: 4877304 (1989-10-01), Bhagavatula et al.
patent: 4889404 (1989-12-01), Bhagavatula et al.
patent: 5327516 (1994-07-01), Chraplyvy et al.
patent: 5361319 (1994-11-01), Antos et al.
patent: 5504829 (1996-04-01), Evans et al.
patent: 5579428 (1996-11-01), Evans et al.
patent: 5611016 (1997-03-01), Fangmann et al.
Ohashi, et al., "Disperion-Modified Single-Mode fiber By VAD Method," Transactions of The Institute of Electronics, vol. E73,. No. 4, 1 Apr. 1990.
Francois, P.L., "Propagation Mechanisms In Quadruple-Clad Fibres: Mode Coupling, Dispersion And Pure Bend Losses", Electronics Letters, 1983, vol. 19, No 21, pp. 8985-886.
Cohen, L.G., et al., "Tailoring The Shapes Of Dispersion Spectra To Control Bandwidths In Single-Mode Fibers", Optics Letters, Apr. 1982, vol. 7, No.4, pp. 183-185.
White, K. I., et al., "Zero Total Dispersion In Step-Index Monomode Fibres AT 1.cndot. 30 And 1.cndot.55 .mu.m", Electronics Letters, Jun. 1979, vol. 15, No. 13, pp 396-397.
Miya, T., et al., "Fabrication Of Low Dispersion Single-Mode Fibers Over A Wide Spectral Range", IEEE Journal Of Quantum Electronics, Jun. 1981, vol QE-17, No. 6, pp 858-861.
Cohen, L. G., et al., "Tailoring The Shapes Of Dispersion Spectra To Control Bandwidths In Single-Mode Fibers", Optics Letters, Apr. 1982, vol. 7, No. 4, pp 183-185.
Okamoto, K., et al., "Dispersion Minimisation In Single-Mode Fibres Over A Wire Spectral Range", Electronics Letters, Oct. 25, 1979, vol. 15, No. 22, pp 729-731.
Cohen, L. G., et al., "Radiating Leaky-Mode Losses In Single-Mode Lightguides With Depressed-Index Claddings," IEEE Journal Of Quantum Electronics, Oct. 1982, vol. QE-18, No. 10, pp 14667-1472.
Kawakami, S., et al., "Characteristics Of A Doubly Clad Optical Fiber With A Low-Index Inner Cladding", IEEE Journal Of Quantum Electronics, Dec. 1974, vol. QE-10, No. 12, pp 879-887.
Bhagavatula, V. A., et al., Dispersion-Shifted Single-Mode Fiber For High-Bit-Rate and Multiwavelength Systems, OFC '95 Technical Digest , Feb. 26-Mar. 3, 1995, vol 8, pp259-260.
Reed, W. A., et al., "Tailoring Optical Characteristics of Dispersion-Shifted Lightguides For Applications Near 1.55 .mu.m", AT&T Technical Journal, Sep./Oct. 1986, vol. 65-5, pp 105-121.
Lucent Technologies - Inc.
Morra Michael A.
Ullah Akm E.
LandOfFree
Optical fiber having a low-dispersion slope in the erbium amplif does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical fiber having a low-dispersion slope in the erbium amplif, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical fiber having a low-dispersion slope in the erbium amplif will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-430293