System and method for generating analog transmission signals
US7076170B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 14, 2002 |
| Grant date | Jul 11, 2006 |
| Priority date | — |
| Expiry date | Feb 1, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/06226
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An RF-lightwave transmitter performs successive conversions of an information-bearing input signal in order to generate an output signal suitable for transmission in a wireless communications system. The transmitter includes a high-efficiency FM laser connected to a FM discriminator. In operation, the laser converts an RF signal into a frequency-modulated optical signal, and the discriminator converts this signal into an amplitude-modulated optical signal. The discriminator performs its conversion using a high slope-efficiency linear transfer function which ensures that the AM optical signal varies in accordance with a desired operational performance. The transmitter also includes a photodiode which converts the AM signal output from the optical discriminator back into an RF signal for transmission. Experimental results demonstrated that a transmitter of this type is able to realize greater than 10 dB RF insertion gain at less than 0 dBm optical power, with a high spurious-free dynamic range and low noise. A signal processor embodied within the transmitter may be used in a purely optical communication systems or may be used for other types of RF-photonics applications such as those…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.