Light receiving module having built-in wavelength-tunable wavelength-selective filter

摘要

A light receiving module having a built-in wavelength-tunable wavelength-selective filter that can selectively receive light with a specific wavelength from laser light with various wavelengths emitted from an optical fiber and tune the specific wavelength. In the light receiving module including a light receiving element having a built-in wavelength-tunable wavelength-selective filter that receives laser light from an optical fiber according to the present invention, a flat plate-shaped window (240) transmitting laser light from an optical fiber (600) is formed in the light receiving element (22), a wavelength-tunable wavelength-selective filter for separating wavelengths of laser light traveling as parallel light is disposed in the light receiving element (22), and a lens (400) converting laser light from the optical fiber (600) into parallel light is disposed between the optical fiber (600) and the light receiving element (22).

主权项

1. A light receiving module including a light receiving element having a built-in wavelength-tunable wavelength-selective filter receiving laser light from an optical fiber, wherein a flat plate-shaped window (240) transmitting laser light from an optical fiber (600) is formed in a light receiving element (22), and a wavelength-tunable wavelength-selective filter (230) for separating wavelengths of laser light traveling as parallel light is disposed in the light receiving element (22);
a lens (400) configured to convert laser light which is received from the optical fiber (600) into parallel light is disposed between the optical fiber (600) and the light receiving element (22); a lens (220) configured to convert parallel light passing through the wavelength-tunable wavelength-selective filter (230) into converging light is disposed between the wavelength-tunable wavelength-selective filter (230) and a photodiode (210) in the light receiving element (22) thereby converging the parallel light into a narrow light receiving area of the photodiode (210); and a heater or a thermoelectric cooler is provided to change the temperature of the wavelength-tunable wavelength-selective filter (230) that transmits different wavelengths in accordance with temperature.