Injection locking characteristics of an AlGaAs semiconductor laser

Autonomous self-healing technique utilizing a self-injection-locked Fabry-Perot laser for optical and wireless communication systems

“…The proposed autonomous self-healing technique is based on the detection of the state change of an injection-locked FP-LD [8]. The self-healing operation is simple because it does not require complicated signal processing, and thus, the high reliability of self-healing operation can be ensured.…”

Semiconductor Laser Amplifier for Single Mode Optical Fiber Communications

“…Injection locking of a laser oscillator consists of coupling a weak optical beam from a laser oscillator of very narrow bandwidth ("locking" oscillator) to the single mode of a much more powerful laser oscillator ("locked" oscillator). When the coupled power of the locking oscillator is sufficiently high, the locked oscillator is forced to oscillate on the locking oscillator frequency, provided the following relation is satisfied [45] …”

“…For intensity modulation, a cw locking oscillator of very narrow linewidth could lock the frequency of a powerful laser diode oscillator which current is directly modulated. For frequency modulation, a cw ILL-SCLA could amplify the output of a directly frequency modulated laser diode oscillator [45]. Recently phase modulation was obtained by injecting the light of an AlGaAs cw oscillator into a directly frequency modulated oscillator: phase modulation was obtained up to 800 MHz [46].…”

Understanding injection locking in negative-resistance LC oscillators intuitively using nonlinear feedback analysis

“…For example, in RF design, mutually injection-locked arrays of oscillators have been used to control the aperture phase of phased-array antennas [14]; in high-frequency PLL design, where the power consumption of frequency dividers is of concern, superharmonically injection-locked oscillator dividers can offer low-power alternatives [18]; in analog fiber-optic applications, injection locking is used to increase laser bandwidth, improve frequency stability and reduce noise and chirp [3], [8]; and so on [11], [15], [16], [19]. Given its ubiquity and myriad applications, it is not surprising that there has been great interest in developing analytical and computational methods for understanding the phenomenon [15], [16], [18]- [21].…”