All-optical analog FM optical receiver
US6359716B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 24, 1999 |
| Grant date | Mar 19, 2002 |
| Priority date | — |
| Expiry date | Feb 24, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/675
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Method and apparatus for an analog FM optical link having a low noise figure and a high spurious-free dynamic range. In one embodiment, the apparatus includes a FM DFB laser and a balanced receiver. The balanced receiver includes an optical splitter to split the received beam into two optical paths. Each of the two paths includes an optical filter and a photodetector. A differentiator coupled to the electrical output of the photodetectors produces a demodulated electrical signal in response to the RF signal used to modulate the DFB laser. This configuration can eliminate the laser relative intensity noise and second order harmonics. In addition, third order distortion is eliminated when there is no intensity modulation or greatly reduced when intensity modulation is present.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.