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High performance laser linewidth broadening for stimulated Brillouin suppression with zero parasitic amplitude modulation

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3 Author(s)
Mitchell, P. ; Bookham Technology, Paignton, Devon TQ47AU, United Kingdom ; Janssen, A. ; Luo, J.K.

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To enable optimum network transmission, the ideal is to launch as high laser power as possible into the optical fiber, to overcome the effects of fiber attenuation and maintain an acceptable signal to noise ratio. Launching high powers into a fiber however, results in unwanted nonlinear effects. Stimulated Brillouin scattering (SBS) is one of the nonlinear effects which reflects a significant proportion of the transmitted optical power back to the transmitter, degrading the system severely. This paper reports the development of a digitally selected supermode distributed Bragg reflector monolithic laser chip which can provide significant linewidth broadening using a pure frequency modulation technique by application of a dither current. By modifying a small segment of the laser chip material refractive index, it produces a modulation of the longitudinal mode and hence laser frequency; the monolithic laser chip has reduced the effects of SBS significantly with very little parasitic amplitude modulation.

Published in:

Journal of Applied Physics  (Volume:105 ,  Issue: 9 )

Date of Publication:

May 2009

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