Abstract
Since the storage of the amplified spontaneous emission (ASE) noise of an amplifier is a cause for the degradation of the transmission characteristics in a long distance soliton transmission using an optical amplifier, the reduction of the ASE is a key issue to be solved for a soliton transmission. A new method to remove the ASE noise using the threshold characteristics (self switching) of a nonlinear amplification loop mirror (NALM) which utilizes the difference in intensity between the soliton signal and the ASE noise is presented in this paper and its application to a transmission experiment is discussed. First, the transmission characteristics of the NALM for a pulse signal are examined. It is demonstrated that the ASE noise can be successfully removed from the pulse signal of high level. The present method is applied to a soliton signal transmitted over 500 km at 10 Gbit/s. The ratio in intensity between the soliton signal and the ASE noise is improved when the NALM is used as compared to the case without it. Finally, it is shown that the switching of pulse close to the transform limit is possible when the phase difference of a pulse peak propagating in a nonlinear loop with a high gain optical amplifier is less than 0.3 π.
| Original language | English |
|---|---|
| Pages (from-to) | 21-29 |
| Number of pages | 9 |
| Journal | Electronics and Communications in Japan (Part II: Electronics) |
| Volume | 76 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - 1993 |
| Externally published | Yes |
Keywords
- Optical soliton
- erbium‐doped fiber amplifier
- frequency chirp
- nonlinear amplifying optical loop mirror
- spontaneous emission
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Computer Networks and Communications
- Electrical and Electronic Engineering