Abstract
We have designed an optical separation device called dual-area mirror for the data link of orbital angular momentum (OAM) multiplexing. Experiments show that the OAM multiplexed beams can be switched by using dual-area mirrors, using OOK to modulate four channels separately to form two inputs, channel A and channel B. There are two OAM beams that are multiplexed in each of channel A and channel B, using a spatial light modulator (SLM) to convert the OAM multiplexed beams in each channel. One of the beams is converted into a Gaussian beam, and then separated by a dual-area mirror, so as to realize the switch of a beam carrying different data in the two channels. Then these channels are detected. The waveform indicates that the switch is successful, and the measured optical power indicates that the dual-area mirror can reduce the bit error rate in the communication links. In addition, the device reduces the experimental cost, is easy to implement, is easy to integrate, and increases the angle between the separated beams.
Highlights
Multiplexing multiple data channels as a method to increase system capacity has been widely used in optical networks [1] [2]
When different data streams are modulated to different orbital angular momentum (OAM) modes in the OAM multiplexing system, switching the data information carried between the OAM modes can increase the flexibility of data processing and management in communication links [13]
We propose a new method of beam separation, which realizes the selective combination of OAM beams from input to output
Summary
Multiplexing multiple data channels as a method to increase system capacity has been widely used in optical networks [1] [2]. A new method has emerged, that is, the use of orbital angular momentum (OAM) beams to carry data information for multiplexing [3] [4] [5] [6]. The application of OAM to achieve reconfigurable network functions in a multiuser environment has more advantages. It is an important development trend in the future to selectively manipulate different OAM data channels and realize OAM-based reconfigurable optical networks [14] [15] [16] [17]. Using the reflective spatial light modulators (SLMs) and the designed dual-area mirrors [20], the OAM multiplexed beams are converted, spatially separated, recombined, restored to the initial state, and sent to the output
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