Injection locking

About: Injection locking is a research topic. Over the lifetime, 4567 publications have been published within this topic receiving 60942 citations.

Carrier generation and data transmission on millimeter-wave bands using two-mode locked Fabry-Perot slave lasers

Abstract: This paper concerns an optical millimeter-wave signal generator for fiber-based millimeter-wave systems. The millimeter-wave signal generator is based on two-mode injection locking of a Fabry-Perot (F-P) laser. The millimeter-wave signal can be induced by self-heterodyne detection of the locked two modes in a high-speed photodetector (PD). The locking characteristics of the F-P slave laser and the tunability for the millimeter-wave carrier frequency are demonstrated. When the F-P laser is directly modulated by data signals, the locked two modes are modulated simultaneously. The data signals can then be up-converted to the millimeter-wave band at the PD output. By this direct modulation method, the effect of fiber chromatic dispersion on the millimeter-wave signal components at the PD output can be moderate according to mixing of amplitude and phase modulation on the locked two modes. In virtue of the wide response of the F-P laser, relatively high-speed data (2.5 Gbit/s nonreturn to zero (NRZ)-ASK or 622 Mbit/s NRZ-BPSK) on the millimeter-wave band (52 or 60 GHz) can be transmitted on a 32-km single-mode fiber without bit error. A wide tunable range (56-63 GHz) for the central frequency of the millimeter-wave signals and a wide optical bandwidth (1530-60 nm) of the F-P slave laser are also confirmed by the bit-error measurements of the transmitted data signals.

A 90µW MICS/ISM band transmitter with 22% global efficiency

Abstract: For fully autonomous implantable or body-worn devices running on harvested energy, the peak and average power dissipation of the radio transmitter must be minimized. We propose a highly integrated 90 µW 400MHz MICS band transmitter with an output power of 20 µW leading to a 22% global efficiency — the highest reported to date for such systems. We introduce a new transmitter architecture based on cascaded multi-phase injection locking and frequency multiplication to enable low power operation and high global efficiency. Our architecture eliminates slow phase/delay-locked loops for frequency synthesis and uses injection locking to achieve a settling time ≪ 250 ns permitting very aggressive duty cycling of the transmitter to conserve energy. At a data-rate of 200 kbps, the transmitter achieves an energy efficiency of 450 pJ/bit. Our 400MHz local oscillator topology demonstrates a figure-of-merit of 204 dB.

Optical control of 14 GHz MMIC oscillators based on InAlAs/InGaAs HBTs with monolithically integrated optical waveguides

Abstract: An In/sub 0.52/Al/sub 0.48/As/In/sub 0.53/Ga/sub 0.47/As heterojunction bipolar transistor (HBT) with a novel integrated optical waveguide for light input has been developed. Detailed modeling is used to validate the design and simulate the coupling of light from the waveguide into the device. Fabricated waveguide-HBT devices exhibited cutoff frequencies of f/sub T/=32 GHz and f/sub max/=48 GHz with 56% of the guided light being converted to photocurrent. Fabricated MMIC oscillators operating at 13.9 GHz exhibited direct optical controllability in the form of optical tuning and injection locking. This is the highest reported frequency for direct optical injection locking in an HBT-based oscillator.

Phase Error Calibration Technique for Rotary Traveling Wave Oscillators

Abstract: Phase error calibration technique that is suitable for an RTWO is presented. By introducing non-uniform capacitors in the distributed resonator, the phase relationships among multiphase outputs available from the RTWO are adjusted to compensate for physical asymmetries. To have a better understanding of the proposed method, we develop a model in which the RTWO is described as injection locked multiple SWOs. The proposed model reveals possible modes of oscillation, their stability, and provides better design insight. The prototype is fabricated in a 110 nm RF-CMOS process, demonstrating more than 10° phase control range at the vicinity of 3 GHz oscillation frequency.

Greatly increased fiber transmission distance with an optically injection-locked vertical-cavity surface-emitting laser

Abstract: We demonstrate single-mode fiber transmission distance enhancement up to 120 km of a directly-modulated injection-locked VCSEL modulated by a 10Gb/s NRZ signal. Injection locking induced data pattern inversion of the VCSEL causes adjustable chirp, which greatly extends reach. Both experiments and simulations are shown to explain this phenomenon.