Negative dispersion-flattened fibre suitable for 10 Gbit∕s directly-modulated signal transmission in whole telecommunication band

Okuno, Toshiaki; Hatayama, H.; Soma, Kentaro; Sasaki, Takashi; Onishi, M.; Shigematsu, Masayuki

doi:10.1049/el:20040521

Cited by 8 publications

(4 citation statements)

References 2 publications

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“…Different types of optical transmitters like directly modulated distributed feedback lasers (DMLs), electro-absorption modulated distributed feedback lasers (EA-DFBs) or externally modulated lasers using MachZehnder LiNbO 3 modulators (MZ) are considered depending on per wavelength bit rate. Recently, low-cost DMLs have attained much attention [17]. Negative dispersion fibers can balance the positive chirp characteristic of directly modulated laser (DML) transmitters and can enhance transmission distance.…”

Section: Introductionmentioning

confidence: 99%

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Segmented-Core Single Mode Optical Fiber With Ultra-Large-Effective-Area, Low Dispersion Slope and Flattened Dispersion for DWDM Optical Communication Systems

Hooda¹,

Rastogi²

2013

PIER B

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Abstract-In this paper we present designs of fibers having non-zero positive, non-zero negative and near-zero ultra-flattened dispersion with small dispersion slope and ultra-large effective area over a wide spectral range. The designs consist of a concentric multilayer segmented core followed by a trench assisted cladding and a thin secondary core. The central segmented core helps in maintaining desired dispersion over a wide range of wavelength. The second core of the fiber helps in achieving ultra-large effective area and trench assisted cladding reduces the bending loss. The designs of the fiber have been analyzed by using the transfer matrix method. For positive non-zero dispersion flattened fiber we have optimized dispersion near +4.5 ps/km/nm in the wavelength range 1.46-1.65 µm. Maximum value of dispersion slope of the fiber in above mentioned wavelength range is 0.026 ps/km/nm 2 . In the design of negative non-zero dispersion flattened fiber, dispersion has been achieved near −6 ps/km/nm in the spectral range of 1.33-1.56 µm and maximum value of dispersion slope is 0.048 ps/km/nm 2 . Dispersion and dispersion slope of near zero dispersion flattened fiber lie in the range [0.0039-0.520] ps/km/nm and [(0.0004)-(0.0365)] ps/km/nm 2 respectively in the spectral range of 1.460-1.625 µm. The near zero dispersion flattened fiber has an ultra-high effective area ranging from 114 µm 2 to 325.95 µm 2 in the aforementioned wavelength range, which covers the entire S+C+L-band. These values of mode area are noticeably higher than those reported in literature for flattened dispersion fibers with large mode area. Designed fiber shows very small bending loss. We report breakthrough in the mode area of the single mode optical fiber with ultra flattened dispersion and low dispersion slope.

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Section: Introductionmentioning

confidence: 99%

“…The wavelength range reported by them also does not cover the entire S+C+L band. Okuno et al have reported a fiber having negative dispersion of about −8 ps/km/nm over the entire telecommunication band [17]. However, the reported mode area is small.…”

Section: Introductionmentioning

confidence: 99%

Segmented-Core Single Mode Optical Fiber With Ultra-Large-Effective-Area, Low Dispersion Slope and Flattened Dispersion for DWDM Optical Communication Systems

Hooda¹,

Rastogi²

2013

PIER B

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“…There are currently no commercial DML lasers at all of the wavelengths and speeds proposed in this work. There are commercial LD optimized to be modulated at speeds of up to 2,5 Gbit/s and 10 Gbits/s directly modulated LD has recently been demonstrated with high performance over a negative dispersion-flattened fiber [4] and 10 Gbits/s CWDM transmission with WPS-NZDSF has also been reported [5] . It is possible to expect that in the near future there will be commercial LDs available which can be directly modulated to higher speed and which are able to emit at any wavelength.…”

Section: Bit Rate/line Coding Of Optical Tributary Signalsmentioning

confidence: 99%

<title>Design and evaluation of a high-performance broadband fiber access based on coarse wavelength division multiplexing</title>

Horche

Campos

2004

SPIE Proceedings

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The proliferation of high-bandwidth applications has created a growing interest in upgrading networks to deliver broadband services to homes and small businesses between network providers. There has to be a great efficiency between the total cost of the infrastructures and the services that can be offered to the end users. Coarse Wavelength Division Multiplexing (CWDM) is an ideal solution to the tradeoff between cost and capacity. This technology uses all or part of the 1270 to 1610 nm wavelength fiber range with optical channel separation about 20 nm. The problem in CWDM systems is that for a given reach the performance is not equal for all of transmitted channels because of the very different fiber attenuation and dispersion characteristics for each channel. In this work, by means of an Optical Communication System Design Software, we study a CWDM network configuration, for lengths of up to 100 km, in order to achieve low Bit Error Rate (BER) performance for all optical channels. We show that the type of fiber used will have an impact on both the performance of the systems and on the bit rate of each optical channel. In the study, we use both on the already laid and widely deployed singlemode ITU-T G.652 optical fibers and on the latest "water-peak-suppressed" versions of the same fiber as well as G.655 fibers. We have used two types of DML. One is strongly adiabatic chirp dominated and another is strongly transient chirp dominated. The analysis has demonstrated that all the studied fibers have a similar performance when laser strongly adiabatic chirp dominated is used for lengths of up to 40 Km and that fibers with negative sign of dispersion has a higher performance for long distance, at high bit rates and throughout the spectral range analyzed. An important contribution of this work is that it has demonstrated that when DML are used it produces a dispersion accommodation that is function of the fiber length, wavelength and bit rate. This could put in danger the quality of a system CWDM if it is not designed carefully.

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“…Controllability of chromatic dispersion in PCFs is very important for realistic applications. In particular, ultraflattened dispersion PCFs are indispensable for optical data transmission systems over a broadband wavelength range [5] , because of the reduction of the accumulated dispersion difference in telecommunication bands without any zero-dispersion wavelength. To achieve ultraflattened dispersion in PCFs, several intriguing designs have been proposed.…”

mentioning

confidence: 99%

Study of ultraflattened dispersion square-lattice photonic crystal fiber with low confinement loss

Tan

Geng

Tian

et al. 2009

Optoelectron. Lett.

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A new type ultraflattened dispersion square-lattice photonic crystal fiber with two different air-hole diameters in cladding region is proposed and the dispersion is investigated using a compact 2-D finite difference frequency domain method with the anisotropic perfectly matched layers (PML) absorbing boundary conditions. Through numerical simulation and optimizing the geometrical parameters, we find that the photonic crystal fibers proposed can realize ultraflattened dispersion of 0±0.06 ps/(km·nm) in wavelength range of 1.375 m to 1.605 m, which is more flat than that of triangular PCF, and the confinement loss is as low as about 0.01 dB/km at wavelength of 1.55 m.Photonic crystal fibers (PCFs) present greater advantages, such as endlessly single-mode at all wavelengths [1] , tailorable effective modal areas [2] , anomalous dispersion at visible and near infrared band [3] and highly birefringent effect [4] . Controllability of chromatic dispersion in PCFs is very important for realistic applications. In particular, ultraflattened dispersion PCFs are indispensable for optical data transmission systems over a broadband wavelength range [5] , because of the reduction of the accumulated dispersion difference in telecommunication bands without any zero-dispersion wavelength. To achieve ultraflattened dispersion in PCFs, several intriguing designs have been proposed. In conventional PCFs with all the same air-hole diameter in the cladding region, the dispersion slope can be significantly reduced by lowering the ratio between hole-size d and pitch [6] , but it has a high confinement loss of about 0.57 dB/m at a wavelength of 1.55 m [7] . New designs for ultraflattened dispersion PCFs with low confinement loss by varying the hole-size radial have been reported [8][9][10] . However, these approaches bring significant fabrication challenges because several geometrical parameters are needed to simultaneously optimize the dispersion behavior of PCFs. Recently PCFs with two kinds of airhole diameters which can reduce the confinement loss of ultraflattened dispersion with 4 rings were proposed in Ref.[11]. Ref.[12] has demonstrated the technological feasibility of square-lattice PCFs, which can be drawn with the standard stack-and-draw fabrication process. However, previous designs are all based on triangular PCFs, and the report on ultraflattened dispersion properties of square-lattice PCFs is very few. So it is very necessary to investigate ultraflattened dispersion in square-lattice PCFs.In this paper, we propose a new kind of square-lattice PCF with five rings air-holes whose structure is similar to that in Ref [11]. Only two different air-hole diameters are used to avoid extensive complications of the fabrication process. A compact two-dimensional (2-D) finite difference frequency domain approach described in Ref.[13] with anisotropic perfectly matched layers (PML) absorbing boundary conditions is used. The calculated results show that our proposed PCF can simultaneously realize ultra-flattened dispersion and low confin...

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Negative dispersion-flattened fibre suitable for 10 Gbit∕s directly-modulated signal transmission in whole telecommunication band

Cited by 8 publications

References 2 publications

Segmented-Core Single Mode Optical Fiber With Ultra-Large-Effective-Area, Low Dispersion Slope and Flattened Dispersion for DWDM Optical Communication Systems

Segmented-Core Single Mode Optical Fiber With Ultra-Large-Effective-Area, Low Dispersion Slope and Flattened Dispersion for DWDM Optical Communication Systems

<title>Design and evaluation of a high-performance broadband fiber access based on coarse wavelength division multiplexing</title>

Study of ultraflattened dispersion square-lattice photonic crystal fiber with low confinement loss

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