Hybrid Gain Medium used in Multiwavelength Ring Laser for Noise Reduction

Abstract

Multiwavelength ring laser based on hybrid gain medium with semiconductor optical amplifier and erbium doped fiber amplifier plays a vital role in noise reduction. The proposed scheme is evaluated with output power, long term stability and side mode suppression using hybrid gain medium. More than 40 lines with high output power is achieved in this set up. The wavelength interval between the channels is 0.29nm. The laser can be tuned from 1545nm to 1555nm. The multiwavelength ring laser with 0dB noise power is used for broad band transmission and various applications.

Seamless Channel Spacing in Multiple Wavelength Fiber based Lasers

“…It should be noted that at double transmission trip (time delay) which is equivalent to two cascaded delay interferometer, the channel spacing between two adjacent lasing lines reduces. Therefore, multiple transmission trips (time delay) through delay interferometer will further reduce the wavelength spacing and increase the number of output channels [13]. The variation of time delay of interferometer filter with the Channel spacing produced (wavelength spacing between two adjacent lasing lines at different time delay of the interferometer) is given in Figure 2.…”