DZS has been granted a patent for a passive optical network system that includes an optical line terminator (OLT) and multiple optical network units (ONUs). The OLT is able to detect signal strength and phase of burst-mode uplink signals from each ONU, and control the ONUs to equalize signal strengths and adjust signal phases. The ONUs receive control messages from the OLT to adjust signal strength and phase accordingly. GlobalData’s report on DZS gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on DZS, data center optical networking was a key innovation area identified from patents. DZS's grant share as of June 2023 was 1%. Grant share is based on the ratio of number of grants to total number of patents.
Patent granted for controlling signal strength and phase in optical network
A recently granted patent (Publication Number: US11646791B2) describes a passive optical network system that includes an optical line terminator (OLT) and multiple optical network units (ONUs). The OLT is equipped with a power measurer, a phase detector, and a remote transmission signal controller. The power measurer measures the signal strength of an electrical signal converted from a burst-mode uplink optical signal received in each channel allocated to the ONUs in a test mode. The phase detector detects the phase of the electrical signal obtained by conversion for each ONU in the test mode. The remote transmission signal controller determines the reference signal strength based on the measured signal strength for each ONU and creates and transmits a signal strength control message and a phase control message to control the signal strength and synchronization of each ONU, respectively.
The ONUs, on the other hand, are equipped with a control message receiver, a signal strength controller, and a phase controller. The control message receiver receives the signal strength control message and the phase control message from the OLT. The signal strength controller adjusts the signal strength of the burst-mode uplink optical signal based on the received signal strength control message. The phase controller adjusts the delay to align the phase of the burst-mode uplink optical signal based on the received phase control message.
The patent also mentions that the signal strength control message and the phase control message transmitted from the remote transmission signal controller of the OLT include information for signal strength increase/decrease and delay increase/decrease, respectively. The OLT creates and transmits the signal strength control message based on the difference between the reference signal strength and the measured signal strength of the burst-mode uplink optical signal received by an ONU in a data mode. Similarly, the phase control message is created and transmitted based on the difference between the desired phase and the detected phase of the burst-mode uplink optical signal received by an ONU in a data mode.
Additionally, both the OLT and the ONUs can be equipped with a guard time setter to set a burst mode guard time according to user input.
In summary, the granted patent describes a passive optical network system that utilizes an OLT and ONUs to control the signal strength and synchronization of burst-mode uplink optical signals. The system includes a power measurer, a phase detector, and a remote transmission signal controller in the OLT, and a control message receiver, a signal strength controller, and a phase controller in the ONUs. The patent also mentions the inclusion of signal strength control messages, phase control messages, and the ability to set a guard time for burst mode.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
