Soliton Transmission in Fiber Optics

Hi all,
Thank you all for sharing and posting your links and your comments.
It is really helpful and important information about soliton-transmission-in-fiber-optics.
As far I know about soliton transmission and its advantage as :
1. Because of the unique features of optical solitons, soliton transmission can help to solve other problems of data transmission, like polarization mode dispersion.
2. Also, when used with frequency guiding filters (sliding guiding filters in particular), the soliton systems provide continuous all-optical regeneration of the signal suppressing the detrimental effects of the noise
3. Reduces the penalties associated with wavelength-division multiplexed (WDM) transmission.
4. Because the soliton data looks essentially the same at different distances along the transmission, the soliton type of transmission is especially attractive for all-optical data networking.
5. Moreover, because of the high quality of the pulses and return-to-zero (RZ) nature of the data, the soliton data is suitable for all-optical processing.

Please comment on above advantages of soliton transmission. are you agree with it not.

Thanks and regards,
Rajguru

Hi Fayiqa,
You have talked about frequency guiding filters; I have read about it.
Yeah, it is one of useful components in case of Soliton system.
It adds various advatages as compared to simple filters like:
Coupling between amplitude and frequency fluctuations that is due to filter sliding,
enhances timing jitter in soliton transmission controlled by in-line filters.
It gradually translates the peak frequency of guiding filters along its length,
we create a fiber transmission line that is substantially opaque to noise while remaining transparent to solitons.
This allows the use of stronger filters, and hence greater jitter reduction,
without incurring the usual penalty of exponentially rising noise from the excess gain required to overcome filter loss.
The sliding-frequency guiding filter causes an improved form of soliton jitter control.
These filters can guide the soliton pulses to slightly different wavelengths continuously,
although they are made to be identical.

These advatages all causes to use frequency guiding filters in solitons system.
Thanks
Rajguru

Hi Ranjeet,
I agree to your points that “The application of solitons in communication
systems opens the way to ultrahigh-speed information superhighways”. Soliton based optical
communication systems can be used over distances of several thousands
of kilometers with huge information carrying capacity by using optical
amplifiers.
The existence of solitons in optical fibers is the result of a balance between the chirps induced by fiber dispersion characterized by GVD (GroupVelocity Dispersion) coefficient β2and fiber nonlinearity characterized by SPM (self-phase modulation) coefficient γ.
Analytically soliton is a solution of nonlinear Schrodinger equation describing pulse propagation in optical fiber. Soliton based optical fiber communication systems are more suitable for long haul communication because of their
very high information carrying capacity and repeater less transmission. Soliton pulses does not affected(by dispersion)
after long distance communication.
Soliton communication systems require an optical source capable of
producing chirp free pico-second pulses at a high repetition rate with
a shape closest to the “sech” shape. The source should operate in the
wavelength region near 1.55 µm.
Early experiments on soliton transmission used the technique of
gain switching for generating optical pulses of 20–30 ps duration by
biasing the laser below threshold and pumping it high above threshold
periodically.

Thanks