Method, device, receiver and communication system for monitoring optical signal-to-noise ratio
An optical signal-to-noise ratio and receiver technology, applied in the field of optical communication, can solve problems such as limiting the accuracy of OSNR monitoring, and achieve the effect of improving accuracy
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Embodiment 1
[0039] Embodiment 1 of the present application provides a device for monitoring an optical signal-to-noise ratio, and the device for monitoring an optical signal-to-noise ratio can be used in a receiver of an optical communication system. figure 1 It is a schematic diagram of the device for monitoring optical signal-to-noise ratio in Example 1 of the present application. Such as figure 1 As shown, the apparatus 100 may include: an extraction unit 103 , a correction unit 104 and a calculation unit 105 .
[0040] In this embodiment, the extracting unit 103 is configured to extract a first signal from a signal obtained by the receiver after performing equalization processing on the received optical signal, the optical signal includes a signal with a known frequency, and the first signal is related to the Signals with known frequencies have the same spectral characteristics; the correction unit 104 corrects the first signal extracted by the extraction unit 103 according to the fi...
Embodiment 2
[0082] Embodiment 2 of the present invention also provides a receiver, which includes the apparatus 100 for monitoring optical signal-to-noise ratio described in Embodiment 1, and its composition is as described in Embodiment 2, and will not be repeated here.
[0083] Figure 8 It is a schematic diagram of the structure of the receiver according to Embodiment 2 of the present invention.
[0084] In addition, after the signal sent by the transmitter 1201 is transmitted through the link 1203, the signal received by the receiver 1202 may contain various linear and nonlinear impairments. Therefore, the device 1413 for monitoring the optical signal-to-noise ratio extracts different polarization Before the pilot signal and non-pilot signal, the received signal can also be processed accordingly, such as compensating for the residual dispersion of the received signal, the unbalance effect of the receiver, and the frequency deviation between the receiver and the transmitter and phase ...
Embodiment 3
[0106] The figure is a schematic configuration diagram of a coherent optical communication system according to Embodiment 3 of the present invention. Such as Figure 10 As shown, the coherent optical communication system 1200 includes a transmitter 1201, a receiver 1202, and a link 1203 between the transmitter 1201 and the receiver 1202; wherein, the composition of the receiver 1202 is as shown in Embodiment 2, and its content is incorporated in Therefore, it will not be repeated here.
[0107] In this embodiment, the transmitter 1201 may transmit an optical signal, the optical signal includes a signal carrying data and a signal with a known frequency, wherein the frequency of the signal with a known frequency is different on the two polarization states, the The time domain structure of the optical signal can be as figure 2 As shown, the spectrum of the optical signal can be as Figure 4 shown. The optical signal propagates through the link 1203 and is received by the recei...
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