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ABSTRACT: This Letter demonstrates a polarization-maintaining higher-order mode fiber module that has anomalous dispersion at 1 μm. The group velocity dispersion of the module is measured, showing a split of the two polarization axes. The excellent polarization-maintaining properties of the relevant fiber modes for the higher-order mode fiber are likewise demonstrated employing a new simple method for the measurement of the beat length of higher-order modes at a single wavelength. The higher-order fiber module is intended for group velocity dispersion compensation.
Optics Letters 10/2012; 37(20):4170-2. · 3.40 Impact Factor
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ABSTRACT: A cladding pumped multicore erbium-doped fiber amplifier for simultaneous amplification of 6 channels is demonstrated. Peak gain over 32 dB has been obtained at a wavelength of 1560 nm and the bandwidth measured at 20-dB gain was about 35 nm. Numerical modeling of cladding pumped multicore erbium-doped amplifier was also performed to study the properties of the amplifier. The results of experiment and simulation are found to be in good agreement.
Optics Express 08/2012; 20(18):20191-200. · 3.59 Impact Factor
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S Chandrasekhar,
A H Gnauck,
Xiang Liu,
P J Winzer,
Y Pan,
E C Burrows,
T F Taunay,
B Zhu,
M Fishteyn, M F Yan,
J M Fini,
E M Monberg,
F V Dimarcello
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ABSTRACT: We demonstrate 2688-km multi-span transmission using wavelength-division multiplexing (WDM) of ten 50-GHz spaced 128-Gb/s PDM-QPSK signals, space-division multiplexed (SDM) in a low-crosstalk 76.8-km seven-core fiber, achieving a record net aggregate per-fiber-spectral-efficiency-distance product of 40,320 km·b/s/Hz. The demonstration was enabled by a novel core-to-core signal rotation scheme implemented in a 7-fold, synchronized recirculating loop apparatus.
Optics Express 01/2012; 20(2):706-11. · 3.59 Impact Factor
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Xiang Liu,
S Chandrasekhar,
X Chen,
P J Winzer,
Y Pan,
T F Taunay,
B Zhu,
M Fishteyn, M F Yan,
J M Fini,
E M Monberg,
F V Dimarcello
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ABSTRACT: We demonstrate the generation of a 1.12-Tb/s superchannel based on coherent optical orthogonal frequency-division multiplexing with polarization-division multiplexed 32-QAM subcarriers, achieving a net intrachannel-spectral-efficiency (ISE) of 8.6 b/s/Hz. Using space-division multiplexing (SDM), we transmit this superchannel over a 76.8-km low-crosstalk multi-core-fiber (MCF) with a record aggregate ISE of 60 b/s/Hz per fiber. We also discuss the impact of core-to-core crosstalk on transmission performance, as well as future perspectives of MCF-based SDM transmission.
Optics Express 12/2011; 19(26):B958-64. · 3.59 Impact Factor
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ABSTRACT: A record capacity of 112 Tb/s with 14-b/s/Hz aggregate spectral efficiency is transmitted over a 76.8-km seven-core-fiber using space-division multiplexing. Each core carries 160 107-Gb/s PDM-QPSK channels on a 50-GHz grid in the C and L bands.
Optical Communication (ECOC), 2011 37th European Conference and Exhibition on; 10/2011
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ABSTRACT: We describe a new multicore fiber (MCF) having seven single-mode cores arranged in a hexagonal array, exhibiting low crosstalk among the cores and low loss across the C and L bands. We experimentally demonstrate a record transmission capacity of 112 Tb/s over a 76.8-km MCF using space-division multiplexing and dense wavelength-division multiplexing (DWDM). Each core carries 160 107-Gb/s polarization-division multiplexed quadrature phase-shift keying (PDM-QPSK) channels on a 50-GHz grid in the C and L bands, resulting in an aggregate spectral efficiency of 14 b/s/Hz. We further investigate the impact of the inter-core crosstalk on a 107-Gb/s PDM-QPSK signal after transmitting through the center core of the MCF when all the 6 outer cores carry same-wavelength 107-Gb/s signals with equal powers, and discuss the system implications of core-to-core crosstalk on ultra-long-haul transmission.
Optics Express 08/2011; 19(17):16665-71. · 3.59 Impact Factor
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ABSTRACT: A multicore erbium-doped fiber (MC-EDF) amplifier for simultaneous amplification in the 7-cores has been developed, and the gain and noise properties of individual cores have been studied. The pump and signal radiation were coupled to individual cores of MC-EDF using two tapered fiber bundled (TFB) couplers with low insertion loss. For a pump power of 146 mW, the average gain achieved in the MC-EDF fiber was 30 dB, and noise figure was less than 4 dB. The net useful gain from the multicore-amplifier, after taking into consideration of all the passive losses, was about 23-27 dB. Pump induced ASE noise transfer between the neighboring channel was negligible.
Optics Express 08/2011; 19(17):16715-21. · 3.59 Impact Factor
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ABSTRACT: This letter describes a novel structure and crosstalk characteristics of a graded-index multicore fiber with seven cores arranged in a hexagonal array. A total of 70 Gb/s (7 × 10 Gb/s) is transmitted over a single 100-m seven-core multimode fiber (MMF) using tapered multicore fiber connectors and 850-nm vertical-cavity surface-emitting lasers, demonstrating high-speed multicore MMF transmissions for parallel optical data links.
IEEE Photonics Technology Letters 12/2010; · 2.19 Impact Factor
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ABSTRACT: This paper describes a novel structure of a graded-index multicore fiber with seven cores arranged in a hexagonal array. Total 70-Gb/s (7×10-Gb/s) is transmitted over a single 100-meter seven-core multimode fiber using tapered multicore fiber connectors and 850nm VCSELs.
Optical Communication (ECOC), 2010 36th European Conference and Exhibition on; 10/2010
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ABSTRACT: We demonstrate a Raman fiber laser with an operating wavelength of 1480 nm and record output power of 81 W. High-power operation is enabled by a long-period grating used to frustrate backward lasing at the Stokes wavelength in the Yb-doped fiber amplifier. A cascaded Raman fiber with a long-wavelength fundamental mode cutoff enables efficient multiple Stokes scattering from 1117 to 1480 nm while preventing further unwanted scattering to 1590 nm.
Optics Letters 09/2010; 35(18):3069-71. · 3.40 Impact Factor
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ABSTRACT: Low-crosstalk multicore fibers are modeled including crucial impacts of bends and core variation. We propose spinning of multicore fiber and demonstrate that this can provide a large additional reduction in crosstalk.
OptoeElectronics and Communications Conference (OECC), 2010 15th; 08/2010
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ABSTRACT: We design and fabricate a novel multicore fiber (MCF), with seven cores arranged in a hexagonal array. The fiber properties of MCF including low crosstalk, attenuation and splice loss are described. A new tapered MCF connector (TMC), showing ultra-low crosstalk and losses, is also designed and fabricated for coupling the individual signals in-and-out of the MCF. We further propose a novel network configuration using parallel transmissions with the MCF and TMC for passive optical network (PON). To the best of our knowledge, we demonstrate the first bi-directional parallel transmissions of 1310 nm and 1490 nm signals over 11.3-km of seven-core MCF with 64-way splitter for PON.
Optics Express 05/2010; 18(11):11117-22. · 3.59 Impact Factor
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C. Headley,
S. Ramachandran,
J. Phillips,
K. Brar,
S. Ghalmi, M.F. Yan,
J.W. Nicholson,
P.W. Wisk,
D. Trevor,
J. Fleming,
E. Monberg,
F. Dimarcello,
R.S. Windeler,
J.M. Fini,
D.J. DiGiovanni
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ABSTRACT: Fiber devices that amplify light propagating in a single fundamental mode face several challenges in extracting ever-increasing powers. Here we explore the advantages and present results showing amplification of light in a single higher order mode.
IEEE Lasers and Electro-Optics Society, 2008. LEOS 2008. 21st Annual Meeting of the; 12/2008
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J.M. Fini,
P.I. Borel, M.F. Yan,
S. Ramachandran,
A.D. Yablon,
P.W. Wisk,
D. Trevor,
D.J. DiGiovanni,
J. Bjerregaard,
P. Kristensen,
K. Carlson,
P.A. Weimann,
C.J. Martin,
A. McCurdy
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ABSTRACT: Ring-assisted fibers suppress unwanted modes, improving the tradeoff that limits bend loss. Fabricated fibers achieve low bend loss and compatibility with standard fibers required for fiber to the home.
Optical Communication, 2008. ECOC 2008. 34th European Conference on; 10/2008
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J W Nicholson,
A D Yablon, M F Yan,
P Wisk,
R Bise,
D J Trevor,
J Alonzo,
T Stockert,
J Fleming,
E Monberg,
F Dimarcello,
J Fini
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ABSTRACT: Femtosecond fiber lasers together with nonlinear fibers are compact, reliable, all-fiber supercontinuum sources. Maintaining an all-fiber configuration, however, necessitates pulse compression in an optical fiber, which can lead to nonlinearities for subhundred femtosecond, nanojoule pulses. In this work we show that using large-mode-area fibers for pulse compression mitigates the nonlinearity, resulting in compressed pulses with significantly reduced satellite pulses. Consequently, supercontinua generated with these pulses are shown to have as much as a 10 dB increase in coherence fringe contrast. By using a hybrid highly nonlinear fiber-photonic crystal fiber, the continuum can be extended to visible wavelengths while still maintaining high coherence.
Optics Letters 10/2008; 33(18):2038-40. · 3.40 Impact Factor
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Laser & Photonics Review 09/2008; 2(6):429 - 448. · 7.39 Impact Factor
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J.M. Fini,
P.I. Borel, M.F. Yan,
S. Ramachandran,
A.D. Yablon,
P.W. Wisk,
D. Trevor,
D.J. DiGiovanni,
J. Bjerregaard,
P. Kristensen,
K. Carlson,
P.A. Weimann,
C.J. Martin,
A. McCurdy
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ABSTRACT: Solid fibers with greatly reduced bend loss are presented. Ring-assisted fibers provide enhanced cutoff, allowing .01dB / turn cable losses around a 9.5 mm mandrel while meeting cutoff and MFD standards and avoiding potential problems with holes.
Opto-Electronics and Communications Conference, 2008 and the 2008 Australian Conference on Optical Fibre Technology. OECC/ACOFT 2008. Joint conference of the; 08/2008
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ABSTRACT: We demonstrate propagation of 14 nJ femtosecond pulses through a large-mode-area, higher-order-mode (HOM) fiber with an effective area of 2100 microm2. The pulses propagate stably in the LP07 mode of the fiber through lengths as long as 12 m. The strongly chirped pulses exiting the amplifier fiber are dechirped by the high-order-mode fiber, resulting in pulses with a peak power of 61 kW after propagation in 5 m of the positive-dispersion fiber. A small amount of self-phase modulation is observed in the compressed pulses and is described well by a nonlinear Schrödinger equation model that takes into account the measured effective area and dispersion of the HOM fiber.
Optics Letters 12/2006; 31(21):3191-3. · 3.40 Impact Factor
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ABSTRACT: Suppression of stimulated Raman scattering (SRS) is demonstrated in a cladding-pumped fiber amplifier. The Yb-doped amplifier fiber design incorporates a high-index ring that resonantly couples SRS wavelengths out of the gain material, thus filtering the gain. Modeling shows that fiber asymmetry plays an important role in the filtering spectrum.
Optics Letters 10/2006; 31(17):2550-2. · 3.40 Impact Factor
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ABSTRACT: We demonstrate an all-solid (nonholey), silica-based fiber with anomalous dispersion at wavelengths where silica material dispersion is negative. This is achieved by exploiting the enhanced dispersion engineering capabilities of higher-order modes in a fiber, yielding + 60 ps/nm km dispersion at 1080 nm. By coupling to the desired higher-order mode with low-loss in-fiber gratings, we realize a 5 m long fiber module with a 300 fs/nm dispersion that yields a 1 dB bandwidth of 51 nm with an insertion loss of approximately 0.1 dB at the center wavelength of 1080 nm. We demonstrate its functionality as a critical enabler for an all-fiber, Yb-based, mode-locked femtosecond ring laser.
Optics Letters 10/2006; 31(17):2532-4. · 3.40 Impact Factor
