All-optical phase modulation in a traveling wave semiconductor laser amplifier

Abstract

Abstract-A novel all-optical phase modulation and wavelength conversion has been demonstrated in a traveling wave semiconductor laser amplifier. Even though the optical gain modulation caused by the saturation effect in a traveling wave semiconductor laser amplifier is sensitive to the signal wavelength, the optically controlled phase modulation is relatively independent of the signal wavelength.

Optical Fiber Code Division Multiple Access Networks: A Review

“…Gold codes were employed and theoretical predictions regarding the performance of the system were drawn although no comments on the representation changes of the bipolar codes due to the positive optical channel (the +1, −1 pulses become +1, 0). Such analysis is given by Kourtis and co-workers in [114,115], where the authors provide the very useful transformation expression Y (t) = 2X (t) − N , linking the unipolar version of transmitted sum of N CDMA signals, X (t), with its original bipolar form, Y (t). This is of fundamental importance for baseband CDMA optical transmission, but can also be exploited in schemes such as Sequence Inverse Keying described above.…”