7 results about "Zero-dispersion wavelength" patented technology

This optical fiber comprises a core that contains germanium, and a cladding that surrounds the core. The zero-dispersion wavelength of the optical fiber is 1307-1317 nm. The standard deviation of the zero-dispersion wavelength is 1.6 nm or less.

The discovery of a clear correlation between the Anderson localization length and the dispersion properties of highly localized TALOF modes allowed us to demonstrate that the zero dispersion wavelength can be tuned over more than 300 nm within the same fiber by selected excitation of specific modes. This enabled apparatus and methods for generating tunable, multi-octave-spanning supercontinuum (SC) spectra in a bandwidth from 460 nm to 1750 nm. Associated applications are also presented.

The present invention provides an optical fiber with improved optical properties such as zero dispersion wavelength by suppressing the volatilization of dopant materials such as germanium dioxide and optimizing the refractive index distribution by adjusting the setting position of the core portion burner for deposition in a larger optical fiber preform. An optical fiber preform includes a core portion with a relatively high refractive index and a clad portion with a relatively low refractive index, wherein a position having a value of 45% of a refractive index difference between a center of the core portion and the clad portion is a boundary rcore (mm) between the core portion and the clad portion; and when a radius position r at which a refractive index difference with the clad portion being a maximum value is rside (mm), rside / rcore is 0.745 to 1.

Provided is a communication device that performs wavelength division multiplexing communication with a counterpart device that is a communication partner. The communication device comprises: a wavelength arrangement determination unit that determines a plurality of wavelengths to be used for communication with the counterpart device on the basis of a wavelength arrangement determined so as not to overlap a frequency position of idler light generated by four-wave mixing and an estimate value of the zero dispersion wavelength of a communication path connected to the counterpart device; a plurality of transmitters that transmit the light of the plurality of wavelengths determined by the wavelength arrangement determination unit; and a multiplexing unit that wavelength-multiplexes and outputs the light of the plurality of wavelengths outputted from each of the plurality of transmitters.　

An optical fiber may include a core region and a cladding region surrounding the core region. The cladding region may include an inner cladding region surrounding the core region, a depressed-index cladding region surrounding the inner cladding region, and an outer cladding region surrounding the depressed-index cladding region. The inner cladding region may include a thickness greater than or equal to 1 μm. The depressed-index cladding region may include a first region and a second region, wherein a relative refractive index of the depressed-index cladding region may decrease monotonically with increasing radius in the first region, and wherein the relative refractive index of the depressed-index cladding region may be substantially constant in the second region. The optical fiber may achieve low microbend loss with large mode field diameter, while also maintaining low macrobend loss, low cable cutoff, and / or a zero dispersion wavelength between 1300 nm and 1324 nm.

Provided is an MCF or the like having a configuration that is excellent in mass productivity, and that can suppress an increase in connection cost and connection loss. The MCF has a core group including 12 or 16 cores, a common cladding layer, and a resin covering portion. The cores are arranged in a line-symmetrical position in a state in which cores in an adjacent relationship with respect to any core do not have an adjacent relationship with each other. The covering outer diameter is 235 μm or more and 265 μm or less, and the nominal value of the diameter CD with respect to the common cladding layer is 195 μm or less, converging to a value range of CD nominal ±1 μm, the MFD at a wavelength of 1310 nm converges to a value range of the prescribed MDF reference value ±0.4 μm with respect to a prescribed MDF reference value of 8.2 μm or more and 9.2 μm or less, and the cable cutoff wavelength λ cc is 1260 nm or less or 1360 nm or less. The zero-dispersion wavelength of each core converges to a value range of a wavelength reference value ±12 nm with respect to a wavelength reference value of 1312 nm or more and 1340 nm or less, and the dispersion slope at the zero-dispersion wavelength is 0.092 ps / (nm 2 ·km) or less. The shortest distance from the covering-cladding layer interface to the center of each core, the configuration, and the optical characteristics satisfy prescribed conditions.

To transmit a plurality of wavelength-multiplexed signal lights in a wavelength band including a wavelength at which wavelength dispersion becomes zero.SOLUTION: The control apparatus includes an acquisition unit configured to acquire a signal-to-noise ratio of each of the plurality of signal lights from the optical reception apparatus, and a calculation unit configured to calculate the signal-to-noise ratio of the signal light based on a level of the signal light and a zero dispersion wavelength of an optical transmission path. And control means for determining a target value of a level of each of the plurality of signal lights output to the optical transmission line by the optical transmission device, and controlling the optical transmission device such that the level of each of the plurality of signal lights output to the optical transmission line by the optical transmission device becomes the target value, wherein the control means sets a wavelength of a signal light at which a signal-to-noise ratio in the optical reception device is lowest in a state where the optical transmission device is controlled such that the level of each of the plurality of signal lights output to the optical transmission line by the optical transmission device is the same, as a zero dispersion wavelength in a closed form.SELECTED DRAWING: Figure 2