Stig Nissen Knudsen

Design and manufacture of dispersion compensating fibre for simultaneous compensation of dispersion and dispersion slope

The negative dispersion slope of dispersion-compensating fibers has been optimized by increasing the width of the depressed cladding. Simultaneous compensation and dispersion slope has been demonstrated on an actual link.

Large effective area dispersion compensating fiber for cabled compensation of standard single mode fiber

Production of wideband dispersion and dispersion slope compensating fiber with 35 /spl mu/m/sup 2/ effective area and low attenuation is demonstrated. This fiber is optimized for cable deployment in a 1:1 length ratio with standard single mode fiber.

1.6 Tb/s (40 /spl times/ 42.7 Gb/s) transmission over 2000 km of fiber with 100-km dispersion-managed spans

We demonstrate 1.6 Tb/s (40 /spl times/ 42.7 Gb/s) WDM transmission over 2000 km of fiber with 100-km amplifier spacing and 100-GHZ channel spacing. Error free transmission of all 40 C-band channels is achieved. We employ dispersion-managed fiber spans, hybrid Raman/Er-doped fiber inline amplifiers. and forward error correction to achieve this record 40 Gb/s WDM transmission distance with terrestrial span lengths.

New dispersion compensating fibres for simultaneous compensation of dispersion and dispersion slope of non-zero dispersion shifted fibres in the C or L band

A new dispersion compensating fiber with extremely high negative dispersion slope is reported. Low insertion loss between 1530 and 1610 nm is demonstrated using a new splice technique.

Broad-band and pulsewidth-maintained wavelength conversion based on a high-nonlinearity DSF nonlinear optical loop mirror

Broad-band and pulsewidth maintained wavelength conversion based on a nonlinear optical loop mirror (NOLM) consisting of 1-km high-nonlinearity dispersion-shifted fiber (HNL-DSF) is realized in the whole C-band. Because only 1-km HNL-DSF fiber issued, the walkoff and dispersion effects are reduced. After 160-km standard single-mode fiber return-to-zero (RZ) transmission at 10 Gb/s and full-dispersion compensation, the converted signal has a small penalty and the pulsewidth of the converted pulses is almost maintained; these results indicate that the converted pulses have very good performance in the whole C-band.

Transparent wavelength conversion in fiber with 24 nm pump tuning range

We demonstrate a transparent CW-pumped highly nonlinear fiber wavelength converter with a conversion bandwidth of 61 nm and a pump wavelength tuning range of 24 nm. The conversion quality is confirmed by bit-error rate measurements showing less than 1.4 dB power penalty at 10 Gbit/s data transmission.

Reducing pulsewidth broadening in L-band EDFAs by use of a new L-band EDF

Due to a small effective area of erbium-doped fiber (EDF), a short pulse will be broadened because of self-phase modulation when it is amplified in an L-band EDF amplifier (EDFA); hence, it is necessary to develop a new EDF with large Er/sup 3+/ concentration to reduce the EDF length and a large effective area to reduce the nonlinear effect in the L-band EDFA. In this letter, it will be demonstrated that the pulsewidth can be maintained when a short pulse is amplified in an L-band EDFA consisting of a new L-band EDF.

Construction of a single/multiple wavelength RZ optical pulse source at 40 GHz by use of wavelength conversion in a high-nonlinearity DSF-NOLM

A single or multiple wavelength RZ optical pulse source at 40 GHz is successfully obtained by using wavelength conversion in a nonlinear optical loop mirror consisting of high nonlinearity-dispersion shifted fiber.

New fibers for future telecommunication systems

Dispersion compensating fiber (DCF) is a mature and widely used technology for dispersion compensation. For future ultra-high-capacity systems where dispersion slope compensation is inevitable, DCFs based on standard single-mode operation has been developed for slope compensation of both non-shifted and non-zero dispersion fibers. For cabled applications, special DCFs has been developed, which are foreseen to be used future in submarine applications.