External cavity laser and WDM-PON (Wavelength Division Multiplex-Passive Optical Network) system

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0023] Embodiments of the present invention firstly provide an external cavity laser, such as figure 2 As shown, it includes a gain medium 1, a filter 2, a Faraday rotating mirror (FRM) 3 and optical fibers connecting the above devices. Wherein, the Faraday rotating reflector 3 can be a 45-degree rotating emitting mirror, which is coupled to the optical fiber between the filter 2 and the output end (not marked) of the outer wall laser, and at least A portion of t...