Adjustable optical attenuator and adjustable optical attenuation wavelength division multiplexer
A technology of wavelength division multiplexer and dimming attenuation, which is applied in the field of adjustable optical attenuation wavelength division multiplexer, can solve the problems of high manufacturing cost and complex structure, and achieve the effect of low price, simple structure and low production cost
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no. 1 example
[0031] see figure 1 , this embodiment has an odd channel input port 11 and an even channel input port 12, which respectively output odd channel signals and even channel signals. After the signal propagating in the optical fiber is demultiplexed by the dense wave decomposition multiplexer, it will be divided into different light beams according to the optical wavelength. The signal of the odd channel and the signal of the even channel are signals of different wavelengths propagated in the optical fiber communication system. For example, in a system with a channel spacing of 50G Hz, the frequency difference between two adjacent channels is 50G Hz, and the channel with an odd channel number in this system is an odd channel, and the frequency of the channel is an odd multiple of 50G Hz. The channel whose channel number is even in the system is an even channel, and its channel frequency is an even multiple of 50G Hz, so the odd channel and the even channel are arranged alternately....
no. 2 example
[0055] see Figure 4 , the present embodiment has an odd channel input port 51, an even channel input port 52, and the output end of the odd channel input port 51 is provided with a circulator 53, and the first port 54 of the circulator 53 receives the light beam L51 emitted from the odd channel input port 51 , the light beam L51 emerges from the second port 55 of the circulator 53 and forms a light beam L52, the light beam L52 is incident on the collimator 57, and the light beam L53 emerging from the collimator 57 is incident on the birefringent crystal 58 and forms a polarization state perpendicular to each other Two light beams L54, L55, the light beam L54 is ordinary light, its polarization state is parallel to the paper, and the light beam L55 is extraordinary light, its polarization state is perpendicular to the paper.
[0056] The beam L61 that emerges from the even channel input port 52 is incident on the first port 64 of the circulator 63, and the beam L62 is incident...
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