Method and system are disclosed for stable, multi-wavelength continuous wave (CW) generation using fiber-based supercontinuum and spectrum-slicing of its longitudinal modes The continuum generated is coherent and stable, making it an attractive alternative as a spectrally-sliced source for continuous, multiple wavelength channels A 140 nm wide supercontinuum with a 10 GHz repetition rate is generated in <30 meters of fiber To obtain CW channels with 40 GHz spacing, time-domain multiplexing and longitudinal mode slicing are utilized To obtain stable, continuous wave operation, short-fiber supercontinuum generation and a pulse interleaving method are utilized The invention may be utilized as a broadband wavelength-division multiplexed source

Method and system for generating a broadband spectral continuum and continuous wave-generating system utilizing same

A system, method and computer program product for positioning pulses, including positioning pulses within a specified time layout according to one or more codes to produce a pulse train having one or more predefined spectral characteristics where a difference in time position between adjacent pulses positioned to produce a spectral characteristic differs from another difference in time position between other adjacent pulses positioned to produce the spectral characteristic. The present invention may include shaping a code spectrum according to a spectral template in order to preserve a pre-defined code characteristic. A pre-defined code characteristic can include desirable correlation, or spectral properties. A transmitter incorporating the present invention can avoid transmitting at a particular frequency. Similarly, a receiver can avoid interference with a signal transmitting at a particular frequency. A radar system, can avoid a radar jammer attempting to jam a particular frequency.

System and method for positioning pulses in time using a code that provides spectral shaping

An optical transmission line which is so constructed as to reduce a dispersion for a signal light with a wavelength band of 1.55νm and realize excellent transmission characteristics and suitable for WDM transmission, comprising one or more transmission units provided between a transmitter - a receiver, a transmitter - a repeater, a repeater - a repeater and a repeater - receiver. Each transmission unit has a dispersion shift optical fiber which is a transmission medium and a mode elimination device which reduces the optical power of the higher order modes other than the basic mode of a signal light propagated through the dispersion shift optical fiber. Particularly, the dispersion shift optical fiber has an incident end to which the signal light is incident and an emission end from which the signal light is emitted, has a dispersion whose absolute value is not larger than 5 ps/nm/km for a light with a wavelength of 1550 nm and a cut-off wavelength longer than the wavelength of the signal light at a fiber length of 2m. The mode elimination device is so constructed as to suppress the optical power of a higher order mode to 1/10 or smaller, more preferably to 1/40 or smaller, of the basic mode optical power in order to satisfy single mode condition in relation to the fiber length.

Optical transmission line

Collisions between solitons in different frequency channels are one of the major sources of errors in transmission systems that utilize wavelength division multiplexing (WDM). Moreover, because standard transmission lines have lumped amplification, the four-wave mixing fields from soliton collisions grow uncontrollably, adding amplitude and timing jitter to the jitter due to ideal soliton collisions. These problems are addressed by using specific dispersion map (100) to implement dispersion management, by which it is possible to significantly reduce the collision-induced timing jitter and to improve system performance even in comparison with that provided by an ideal, exponentially decreasing dispersion fiber (40).

Reduction of collision induced timing jitter by periodic dispersion management in soliton wdm transmission

The invention provides a stimulated Brillouin scattering suppressed optical fiber which is easy to be produced, has an almost zero chromatic dispersion over the entirety of an optical fiber in the lengthwise direction, and has a low light loss. That is, in an optical fiber having a property, by which the chromatic dispersion with respect to optical communication signals becomes zero, obtained by changing the relative refractive index difference of the optical fiber and core diameter in the same increase or decrease direction, the relative refractive index difference of the core and the core diameter R are changed in the lengthwise direction of the optical fiber, and the core diameter R is made smaller in line a decrease the relative refractive index difference of the core while the core diameter R is made larger in line with an increase of the refractive index difference, whereby the chromatic dispersion the designated wavelength band is made nearly equal to zero in the entirety of the optical fiber in the lengthwise direction.

Stimulated brillouin scattering suppressed optical fiber

A method for launching a high-power signal into anomalous-dispersion fiber without suffering excess spectral broadening and waveform distortion. A high-power signal is launched as very short optical solitons, typically with a pulse width of approximately 1 to 10 ps. The pulse width of the solitons will broaden adiabatically (or nearly adiabatically) as they propagate down the anomalous-dispersion fiber as the average power of the soliton decreases. At the same time, the optical spectrum will narrow. After some distance of travel, when the width of the pulses have broadened to a suitable duration and the average power has decreased to a point where penalties from nonlinearities are insignificant, the pulses enter a significantly linear propagation regime with first order dispersion near zero. A dispersion-shifted fiber may be used or any additional dispersion can be compensated at the receiver. Consequently, no further significant broadening of the spectrum occurs when the signal is received at the receiver. Additionally, the initial wide spectrum of the solitons will result in a high stimulated Brillouin scattering (SBS) threshold reducing the need for artificial broadening of the spectrum.

Theodoor Charlouis Damen

Papers

Applications of solitons in transmission systems employing high launch powers