Compact optical millimetre-wave source using a dual-mode semiconductor laser

Photonic Components for Analog Fiber Links

“…Among all these previously reported methods, a favored technique is to use optical heterodyning between two lasing wavelengths whose frequencies are separated by the desired microwave frequency. Optical heterodyning also has the advantage over other generation techniques of generating high RF power, though optical sources with narrow linewidth or feedback loops are required during operation [13]. The following section includes descriptions of the most common techniques to generate microwave signals using the optical heterodyning method, including optical injection locking (OIL) of laser diodes [14], external modulation technique [15], dual-mode semiconductor laser sources [16] as well as using the optical phase locked loop (OPLL) configuration [17].…”

Tunable dual-mode DFB laser for millimetre-wave signal generation

“…Some require an external microwave source such the implementations using an external MachZehnder modulator biased at its extinction voltage [4] or the use of two separate laser chips combined under master-slave arrangement [5] and others did not such a single laser chip generating two wavelengths [6]. All these configurations allow more or less the tunability of the spacing between the two optical modes and so the millimetre-wave frequency that is generated.…”

“…The active layer is composed of InGaAsP quantum wells (6) and barriers. Figure 2 shows a schematic view of the dual-DFB structure.…”

A new method for microwave generation and data transmission using DFB laser based on fiber Bragg gratings

“…Successful implementations of the technique include using an external RF source for frequency locking [4], injection locking [5], and the optical phase-locked loop [6]. Previously, we have reported optical generation of very narrow linewidth ( 1 kHz at 32.5 GHz) microwave carrier using a two-wavelength fiber-based distributed feedback (DFB) laser [7].…”