Mode-locking characteristics of TDM-PON upstream traffic optical power equalizers

In order to reduce the wavelength drift of the time division multiplexing passive optical network (TDM-PON) upstream traffic,based on a architecture with optical power equalization of the upstream traffic in a TDM-PON, using single mode laser injection locking Fabry-Perot laser diode (F-P LD) of optical network unit (ONU), the mode-locking characteristics of Fabry-Perot output laser wavelength was discussed, such as the range of injection-locking, the influence of driving current on mode-locking characteristics, the influence of temperature variation on the wavelength with or without injection-locking. The results show that, for such a laser, when the driving current is 9mA, the injection-locking wavelength range is 0.38nm which is larger than the 0.25nm upstream wavelength drift of the ONU caused by the 5℃ change of environmental temperature. The identical and stable wavelength of the ONU upstream traffic and the low noise after the optical power equalization were achieved by the injection-locking F-P LD.