Laser beam wavelength stabilizing unit and module for stabilizing wavetength of signals in optical communication
A laser beam and wavelength technology, applied in semiconductor laser optics, structural details of semiconductor lasers, lasers, etc., can solve problems such as inability to provide stable wavelengths, increase in manufacturing cost of semiconductor lasers, and occupation.
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no. 1 example
[0049] Figure 7 is a top plan view of a unit 100 for stabilizing the wavelength of a laser beam according to a first embodiment of the present invention.
[0050] The unit 100 includes a substrate 11, a wavelength filter 12 mounted on the substrate 11, a photodetector 13 mounted on the substrate 11, and a housing mounted on the substrate 11 for accommodating the wavelength filter 12 and the photodetector 13 therebetween 14.
[0051] A semiconductor laser (not shown) which is a part of another module radiates a laser beam to the unit 100 through the optical fiber 15 . In particular, a laser beam is introduced into a radiation point 16 through an optical fiber 15 , and then the laser beam is irradiated to the unit 100 as a laser beam 17 .
[0052] The wavelength filter 12 has a transmittance defined as a ratio in which a laser beam that has entered the wavelength filter exits. The wavelength filter 12 directly receives a part of the laser beam 17 , and the transmittance of th...
no. 2 example
[0064] Figure 10 is a top plan view of a unit for stabilizing the wavelength of a laser beam according to a second embodiment of the present invention.
[0065] Compared with the unit 100 according to the first embodiment, the unit 200 according to the second embodiment additionally comprises a lens 20 for correcting the laser beam 17 into a parallel beam. The unit 200 has the same structure as the unit 100 except that the lens 20 is additionally included. Therefore, unless expressly stated, the corresponding Figure 7 Parts or elements of the unit 100 shown in FIG. 2 have been provided with the same reference numerals and operate in the same manner as corresponding parts or elements in the first embodiment.
[0066] The first light receiving surface 18 directly receives part of the parallel light radiated from the radiation point 16 through the lens 20 , and the remaining parallel light beams are directly introduced into the wavelength filter 12 . The second light receivin...
no. 3 example
[0070] Figure 11 It is a top plan view of a module 300 for stabilizing the wavelength of an optical signal in optical communication according to the third embodiment of the present invention.
[0071] Module 300 includes Figure 10 The unit 200, the semiconductor laser module, the thermistor thermometer 35 and the temperature controller 36 for detecting the temperature of the substrate 11 according to the second embodiment are shown in .
[0072] The semiconductor laser module is mounted on the substrate 11 as a part of the unit 200, and includes: a semiconductor laser 31; a first lens 32, which corrects the laser beam irradiated from the semiconductor laser 31 into a parallel beam; A lens 32 for a laser beam irradiated from a semiconductor laser 31; a second lens 34 for receiving a parallel beam that has passed through an optical isolator 33 and forwarding the signal to an optical fiber 15 for optical communication.
[0073] A thermistor thermometer 35 is installed on the ...
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