-
公开(公告)号：US10955691B2
公开(公告)日：2021-03-23
申请号：US16439825
申请日：2019-06-13
摘要： Within a modulator driver, different blocks are employed, e.g. a buffer, one or more variable gain amplifiers (VGA), and a final driver stage. Each of these blocks has an optimum bias point for best performance; however, interconnecting the blocks requires sharing the DC bias points in their interface, which does not necessarily match the optimum performance bias point of each block. Accordingly, a first offset feedback loop extending from reference points after a selected one of the blocks to an input of one of the blocks. The first offset feedback loop includes current sources capable of delivering a variable current to the input of the selected block in order to compensate any offset in an amplified differential input electrical signal measured at the reference points. A first bias feedback loop is also provided, including a current sinker for subtracting excess current introduced in the first offset compensation feedback loop.
-
公开(公告)号：US20200083855A1
公开(公告)日：2020-03-12
申请号：US16126732
申请日：2018-09-10
摘要： In optical receivers, extending the transimpedance amplifier's (TIA) dynamic range is a key to increasing the receiver's dynamic range, and therefore increase the channel capacity. Ideally, the TIA requires controllable gain, whereby the receiver can modify the characteristics of the TIA and/or the VGA to process high power incoming signals with a defined maximum distortion, and low power incoming signals with a defined maximum noise. A solution to the problem is to provide TIA's and VGA's with reconfigurable sizes, which are adjustable based on the level of power, e.g. current, generated by the photodetector.
-
公开(公告)号：US11086188B2
公开(公告)日：2021-08-10
申请号：US16734539
申请日：2020-01-06
发明人： Christopher Williams , Mostafa Ahmed , Alexander Rylyakov , Richard C. Younce , Yang Liu , Ran Ding , Abdelrahman Ahmed
摘要： A multi-section optical modulator and related method are disclosed wherein two waveguide arms traverse a plurality of successive modulating sections. A differential drive signal is applied separately to each waveguide arm of each modulating sections in synchronism with the transmission of light along the waveguide arms, affecting a dual differential driving of each section. By suitably selecting the number of modulating sections and the section length, a high modulation bandwidth and a high modulation efficiency may be achieved simultaneously for a given peak-to-peak voltage swing of the drive signal.
-
公开(公告)号：US20200092010A1
公开(公告)日：2020-03-19
申请号：US16666796
申请日：2019-10-29
摘要： In optical receivers, cancelling the DC component of the incoming current is a key to increasing the receiver's effectiveness, and therefore increase the channel capacity. Ideally, the receiver includes a DC cancellation circuit for removing the DC component; however, in differential receivers an offset may be created between the output voltage components caused by the various amplifiers. Accordingly, an offset cancellation circuit is required to determine the offset and to modify the DC cancellation circuit accordingly.
-
公开(公告)号：US10558104B2
公开(公告)日：2020-02-11
申请号：US16202818
申请日：2018-11-28
发明人： Christopher Williams , Mostafa Ahmed , Alexander Rylyakov , Richard C. Younce , Yang Liu , Ran Ding , Abdelrahman Ahmed
摘要： A multi-section optical modulator and related method wherein two waveguide arms traverse a plurality of successive modulating sections. A differential drive signal is applied separately to each waveguide arm of each modulating sections in synchronism with the transmission of light along the waveguide arms, effecting a dual differential driving of each section. By suitably selecting the number of modulating sections and the section length, a high modulation bandwidth and a high modulation efficiency may be achieved simultaneously for a given peak-to-peak voltage swing of the drive signal.
-
公开(公告)号：US10461967B1
公开(公告)日：2019-10-29
申请号：US16016158
申请日：2018-06-22
摘要： An optical coherent receiver includes an optical hybrid (OH) configured to mix signal and reference light, and two back-end optical ports. An optical equalizing network interconnects two 180° OH output ports with the two back-end optical ports so that each back-end optical port receives light from each of the two OH output ports. Optical signals from each of the two back-end optical ports are converted to electrical signals that are fed to a differential amplifier. Adjusting coupling ratios and/or optical delays in the optical equalizing network reduces an OSNR penalty of a lower-bandwidth differential amplifier.
-
公开(公告)号：US10958230B2
公开(公告)日：2021-03-23
申请号：US16126732
申请日：2018-09-10
摘要： In optical receivers, extending the transimpedance amplifier's (TIA) dynamic range is a key to increasing the receiver's dynamic range, and therefore increase the channel capacity. Ideally, the TIA requires controllable gain, whereby the receiver can modify the characteristics of the TIA and/or the VGA to process high power incoming signals with a defined maximum distortion, and low power incoming signals with a defined maximum noise. A solution to the problem is to provide TIA's and VGA's with reconfigurable sizes, which are adjustable based on the level of power, e.g. current, generated by the photodetector.
-
公开(公告)号：US10862716B2
公开(公告)日：2020-12-08
申请号：US16576156
申请日：2019-09-19
摘要： An optical coherent receiver includes an optical hybrid (OH) configured to mix signal and reference light, and two back-end optical ports. An optical equalizing network interconnects two 180° OH output ports with the two back-end optical ports so that each back-end optical port receives light from each of the two OH output ports. Optical signals from each of the two back-end optical ports are converted to electrical signals that are fed to a differential amplifier. Adjusting coupling ratios and/or optical delays in the optical equalizing network reduces an OSNR penalty of a lower-bandwidth differential amplifier.
-
公开(公告)号：US20200235820A1
公开(公告)日：2020-07-23
申请号：US16838171
申请日：2020-04-02
摘要： In optical receivers, cancelling the DC component of the incoming current is a key to increasing the receiver's effectiveness, and therefore increase the channel capacity. Ideally, the receiver includes a DC cancellation circuit for removing the DC component; however, in differential receivers an offset may be created between the output voltage components caused by the various amplifiers. Accordingly, an offset cancellation circuit is required to determine the offset and to modify the DC cancellation circuit accordingly.
-
公开(公告)号：US20200083846A1
公开(公告)日：2020-03-12
申请号：US16126797
申请日：2018-09-10
摘要： In optical receivers, extending the transimpedance amplifier's (TIA) dynamic range is a key to increasing the receiver's dynamic range, and therefore increase the channel capacity. Ideally, the TIA requires controllable gain, whereby the receiver can modify the characteristics of the TIA and/or the VGA to process high power incoming signals with a defined maximum distortion, and low power incoming signals with a defined maximum noise. A solution to the problem is to provide TIA's with reconfigurable feedback resistors, which are adjustable based on the level of power, e.g. current, generated by the photodetector, and variable load resistors, which are adjustable based on the change in impedance caused by the change in the feedback resistor.
-
-
-
-
-
-
-
-
-
搜索结果
16 条记录 (耗时 0.139 秒)
