Optical transmission system
AssigneeFujitsu Limited
InventorsAkira Miyauchi, Kazuo Yamane, Yumiko Kawasaki, Satoru Okano
Life of this patent
Estimating the term…
Abstract
A chirping parameter .alpha. in a transmitter is set to a positive value with respect to an SMF that has a positive dispersion value with respect to signal light. A dispersion compensator is provided not only at the receiving end but also at the transmitting end. This achieves a reduction in the number of types of dispersion compensators that should be prepared in advance to optimize transmission characteristics despite the variety in the lengths of transmission fibers.
Claims62
An optical transmission system comprising:
- an optical fiber installed between a transmitting end and a receiving end, and having a positive dispersion value with respect to the wavelength of an optical signal to be transmitted from the transmitting end to the receiving end;
- a dispersion compensator connected in series with said optical fiber to at least one of the transmitting end and the receiving end, and having a negative dispersion value with respect to the wavelength of the optical signal to be transmitted;
- and
- a chirping device to apply a positive chirping to the optical signal at the transmitting end.
An optical transmission system comprising:
- an optical fiber installed between a transmitting end and a receiving end, and having a positive dispersion value with respect to the wavelength of an optical signal to be transmitted from the transmitting end to the receiving end;
- and
- a chirping device to apply a positive chirping to the optical signal at the transmitting end such that after transmission through the optical fiber, dispersion influence given to the optical signal is compensated.
An optical transmission system comprising:
- an optical fiber installed between a transmitting end and a receiving end, and having a positive dispersion value with respect to the wavelength of an optical signal to be transmitted from the transmitting end to the receiving end;
- and
- chirping means for applying a positive chirping to the optical signal at the transmitting end such that after transmission through the optical fiber, dispersion influence given to the optical signal is compensated.
An optical transmitter device for use with an optical fiber, comprising:
- an external modulator to modulate light from a light source to thereby produce an optical signal having a wavelength, the optical fiber having a positive dispersion value with respect to the wavelength of the optical signal;
- and
- a chirping device to apply a positive chirping to the optical signal.
A method of producing an optical signal, comprising the steps of:
- transmitting the optical signal over an optical fiber having a positive dispersion value with respect to a wavelength of the optical signal;
- and
- applying a positive chirping to the optical signal such that after transmission through the optical fiber, dispersion influence given to the optical signal is compensated.
An optical transmission system, operatively coupled to an optical fiber having a first dispersion value with respect to a wavelength of an optical signal to be transmitted therethrough, comprising:
- a dispersion compensator connected in series with said optical fiber, and having a second dispersion value with a sign opposite that of the first dispersion value with respect to the wavelength of the optical signal to be transmitted;
- and
- a chirping device to apply a chirping to the optical signal at a transmitting end of the optical fiber so that after transmission through the optical fiber, a pulse width of the optical signal is broadened.
An optical transmission system comprising:
- an optical fiber installed between a transmitting end and a receiving end, and having a dispersion value with respect to the wavelength of an optical signal to be transmitted from the transmitting end to the receiving end;
- and
- a chirping device to apply a chirping to the optical signal at the transmitting end so that after transmission through the optical fiber, a pulse width of the optical signal is broadened and dispersion influence given to the optical signal is compensated.
An optical transmission system, operatively coupled to an optical fiber having a dispersion value with respect to a wavelength of an optical signal to be transmitted therethrough, comprising:
- chirping means for applying a chirping to the optical signal at a transmitting end of the optical fiber so that after transmission through the optical fiber, a pulse width of the optical signal is broadened and dispersion influence given to the optical signal is compensated.
An optical transmitter device for use with an optical fiber, comprising:
- an external modulator to modulate light from a light source to thereby produce an optical signal having a wavelength, the optical fiber having a dispersion value with respect to the wavelength of the optical signal;
- and
- a chirping device to apply a chirping to the optical signal so that after transmission through the optical fiber, a pulse width of the optical signal is broadened.
A method of producing an optical signal, comprising the steps of:
- transmitting the optical signal over an optical fiber having a dispersion value with respect to a wavelength of the optical signal;
- and
- applying a chirping to the optical signal so that after transmission through the optical fiber, a pulse width of the optical signal is broadened and dispersion influence given to the optical signal is compensated.
A dispersion compensator operatively coupled to an optical fiber having a first dispersion value with respect to a wavelength of an optical signal to be transmitted therethrough, comprising:
- a dispersion compensating fiber having a second dispersion value with a sign opposite to that of the first dispersion value with respect to the wavelength of the optical signal to be transmitted,
- wherein a chirping is applied to the optical signal at a transmitting end of the optical fiber so that after transmission through the optical fiber, a pulse width of the optical signal is broadened.
A method of transmitting an optical signal through an optical fiber having a first dispersion value with respect to a wavelength of the optical signal, comprising the steps of:
- applying a chirping to the optical signal at a transmitting end of the optical fiber so that after transmission through the optical fiber, a pulse width of the optical signal is broadened;
- and
- compensating for dispersion in the optical signal with a dispersion compensating fiber having a second dispersion value with a sign opposite to that of the first dispersion value.
Dependencies are inferred from the claim text.