| 1. |
- Hedekvist, Per Olof E, 1967, et al.
(författare)
-
Fiber four-wave mixing demultiplexing with inherent parametric amplification
- 1997
-
Ingår i: Journal of Lightwave Technology. - : Institute of Electrical and Electronics Engineers (IEEE). - 0733-8724 .- 1558-2213. ; 15:11, s. 2051-2058
-
Tidskriftsartikel (refereegranskat)abstract
- We present an all-optical time-division demultiplexer with 22 dB conversion efficiency, using four-wave mixing (FWM) at 1550 nm in a single-mode dispersion-shifted fiber. Error-free demultiplexing of 20 Gb/s data to 10 Gb/s is obtained, with 1.4 dB power penalty at BER = 10-9. We also derive theoretical expressions for the conversion efficiency, the maximum bit rate that is possible to demux and the shape of the switching window. In particular we emphasize the importance of phase-matching in order to achieve a flat switching window. Furthermore the pump must remain undepleted to avoid a detrimental reduction of the extinction ratio due to instantaneous parametric gain saturation.
|
|
| 2. |
- Kallstenius, T, et al.
(författare)
-
On the degradation of InGaAsP/InP-based bulk lasers
- 1999
-
Ingår i: JOURNAL OF LIGHTWAVE TECHNOLOGY. - : IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC. - 0733-8724. ; 17:12, s. 2584-2594
-
Tidskriftsartikel (refereegranskat)abstract
- Degradation of InGaAsP/InP-based buried-heterostructure bulk (BH-bulk) lasers has been studied by means of electroluminescence (EL), photoluminescence (PL), electron-beam-induced current (EBIC) and transmission electron microscopy (TEM). Lasers with p/n a
|
|
| 3. |
- Nilsson, S., et al.
(författare)
-
Improved spectral characteristics of MQW-DFB lasers by incorporation of multiple phase-shifts
- 1995
-
Ingår i: Journal of Lightwave Technology. - : Institute of Electrical and Electronics Engineers (IEEE). - 0733-8724 .- 1558-2213. ; 13, s. 434-441
-
Tidskriftsartikel (refereegranskat)abstract
- The single-mode stability of strained-layer MQW-DFB lasers with electron-beam written gratings containing zero, one and three phase-shifts, and with a relatively large coupling strength, has been investigated theoretically and experimentally. The fabricated lasers with the multiple phase-shifted (MPS) structure exhibited a higher degree of stability than the lambda;/4-shifted lasers, and a considerably improved stability for both categories with phase-shifts compared to the nonshifted lasers was obtained. These results were in good agreement with our simulations. An investigation of the linewidths of the phase-shifted lasers is also presented. The MPS lasers had a significantly lower linewidth floor (down to 600 kHz) than those with one phase-shift. There was no degradation of the side-mode suppression-ratio correlated to the linewidth floor or rebroadening. A possible explanation for the lower linewidth floors obtained for the MPS lasers is that this structure is less sensitive to inhomogeneous carrier fluctuations. Longitudinal fluctuations in the shape of the photon density distribution will thereby be suppressed
|
|
| 4. |
- Petermann, Ingemar, et al.
(författare)
-
Characterization of Fiber Bragg Gratings by Use of Optical Coherence-Domain Reflectometry
- 1999
-
Ingår i: Journal of Lightwave Technology. - : Institute of Electrical and Electronics Engineers (IEEE). - 0733-8724 .- 1558-2213. ; 17:11, s. 2371-2378
-
Tidskriftsartikel (refereegranskat)abstract
- A method based on optical low coherence reflectometry for complete characterization of fiber Bragg gratings (FBG's) is presented. It is shown that the measured signal corresponds to the impulse response of the grating filter, and the measurement therefore. yields all information about the device, Experiments have been carried out with a novel dual-channel interferometer, The results are in excellent agreement with the theory, demonstrating the versatility of the method for characterization of fiber gratings.
|
|
