Methods and apparatus for locking the optical phase of single-sideband amplitude-modulation signals
US8879916B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 4, 2011 |
| Grant date | Nov 4, 2014 |
| Priority date | — |
| Expiry date | Feb 5, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/25759
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
This invention provides an approach to lock the optical phase of a single sideband, carrier-suppressed coherent-AM analog optical link, so that for example an RF signal can be transmitted with high fidelity over fibers. In some embodiments, a method comprises providing a RF locking signal; impressing an RF input signal and the RF locking signal onto the optical field of a suppressed carrier; introducing the optical spectrum to a photonic integrated circuit comprising a microresonator filter and a finite impulse response filter; selectively passing the double sideband, associated with the locking frequency, through the finite impulse response filter; and recovering a RF output signal, wherein a feedback loop provides dithering to stabilize the optical phase of the link and thus preserve amplitude/phase integrity for the RF-photonic signal. The disclosed method is especially suited to the filtering of RF-photonic signals via use of the resonance passbands derived from microdisks or micro-rings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.