System and method for reducing interferometric distortion and relative intensity noise in directly modulated fiber optic links
US7725043B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 7, 2004 |
| Grant date | May 25, 2010 |
| Priority date | — |
| Expiry date | Mar 27, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/06817
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A laser transmitter with a feedback control loop for minimizing noise. The novel laser transmitter includes a laser, an external reflector adapted to form an extended cavity to the laser, and a feedback control loop adapted to detect noise in the laser and in accordance therewith, adjust the optical phase of the extended cavity such that the noise is at a desired level. The optical phase of the extended cavity is adjusted by adjusting an operating parameter of the laser, such as its bias current. In an illustrative embodiment, the feedback control loop is adapted to compute the rate of change of the noise with respect to bias current and in accordance therewith, adjust the bias current of the laser such that relative intensity noise and interferometric intermodulation distortion are simultaneously minimized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.