External cavity type single-wavelength tunable laser using FP (Fabry-Perot) laser as grain light source

Abstract

The invention discloses an external cavity type single-wavelength tunable laser using an FP (Fabry-Perot) laser as a grain light source. The external cavity type single-wavelength tunable laser comprises an FP laser chip; light waveguide is arranged in the FP laser chip; a partial transmission and reflection lens is arranged on the end face of a port for deriving an excitation light source in an optical waveguide port, and a high-reflection membrane is arranged on the end face of the other port; and an optical lens, an optical etalon for carrying out transmission filtering on a transmission light beam of the excitation light source, and a partial reflector for carrying out partial reflection and partial transmission on light beams transmitting the optical etalon are arranged at one side of the port for deriving the excitation light source in the optical waveguide port in sequence. One wavelength peak of the excitation light source is overlapped to one wavelength position of a transmission peak of the optical etalon by changing the distribution of a comb-shaped wavelength wave of the excitation light source, or changing the distribution of the comb-shaped wavelength peak of the excitation light source and the transmission peak of the optical etalon, so that maximum feedback is obtained by a wavelength of a photon at an overlapped position. With the adoption of the external cavity type single-wavelength tunable laser provided by the invention, single-wavelength laser can be output, and a wavelength of output laser can be continuously or selectively changed.

Description

technical field

[0001] The invention relates to a semiconductor laser, in particular to an external cavity single-wavelength tunable laser using an FP multimode laser as a gain light source. Background technique

[0002] Wavelength Division Multiplexing (WDM) has been widely used in optical fiber communication systems. A wavelength division multiplexed optoelectronic transponder consists of a laser, a modulator, a receiver and associated electronics. The operation of the WDM converter can be realized by a fixed-wavelength laser at the near-infrared wavelength of 1550nm. Due to the ease of operation and high reliability, distributed feedback (DFB) lasers are widely used in WDM transmission systems. In the DFB laser, the diffraction grating that provides optical feedback is located above the entire gain resonant cavity, so that the laser will obtain a stable single-mode oscillation at a fixed wavelength. Also, information transmission at low digital rates can also be achiev...

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