Coherent optical receiver using single-ended photodiodes
US10833769B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 18, 2019 |
| Grant date | Nov 10, 2020 |
| Priority date | — |
| Expiry date | Sep 18, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/616
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A PDM-capable coherent optical receiver can be implemented using four high-bandwidth photodiodes connected in a single-ended electrical configuration. The SSBI present in the electrical output of the single-ended photodiodes is effectively canceled in the receiver DSP based on measurements of average optical power of the optical data and local-oscillator signals. In various embodiments, such measurements can be performed using relatively inexpensive circuits/components incorporated into the optical front end of the receiver. For a given signaling interval, the DSP runs an iterative algorithm to compute estimates of the in-phase and quadrature components of the optical data signal and achieve a level of performance comparable to that of a coherent optical receiver having a greater number of high-bandwidth photodiodes connected to form balanced photodetectors. The achieved reduction in the number of high-bandwidth photodiodes can advantageously be used, e.g., to significantly reduce the total cost of a high-speed optical transponder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.