Journal: Optics Express

Article Title: Zero-bias-suppressed angular velocity sensing via a dual-frequency optoelectronic oscillator

doi: 10.1364/oe.567810

Figure Lengend Snippet: Figure 1 illustrates the configuration of the proposed dual-frequency OEO-based angular velocity measurement scheme, which enables a single OEO to simultaneously generate two microwave signals. Two wavelength-tunable laser diodes (LD1, LD2) emit light at two distinct wavelengths. The two optical signals are combined via a 50:50 optical coupler (OC) and injected into a dual-parallel Mach-Zehnder modulator (DPMZM). By adjusting the three bias voltages of the DPMZM, the three internal Mach-Zehnder interferometers (MZIs) are biased at the quadrature point, thereby achieving single-sideband (SSB) modulation. As a result, the modulator outputs two SSB modulated signals at different wavelengths. Since the DPMZM is driven by two microwave signals with distinct frequencies, each optical signal at different wavelengths generates two sidebands on the same spectral side. As illustrated in Fig. 2(a), the single-sideband modulated signal at wavelength λ1 contains only the carrier signal fOC1 and the -1st-order sideband signals: f−1_1 and fother_1. Similarly, the modulated signal at wavelength λ2 comprises solely the carrier signal fOC2 and its corresponding -1st-order sidebands: f−1_2 and fother_2. Regarding the optical signals at wavelengths λ1 and λ2, the sidebands fother_1 and fother_2 constitute spurious components.

Article Snippet: The splitting characteristics of the DI are first characterized by measuring the output optical power at ports 2 and 3 across various input optical wavelengths using LD1 (Keysight, 81606A) and an optical power meter (KEYSIGHT, 81635A).

Techniques: Injection

Journal: PLOS ONE

Article Title: Photobiomodulation as part of multimodal analgesia to improve pain relief and wound healing after elective caesarean section: A protocol for randomized controlled trial

doi: 10.1371/journal.pone.0314010

Figure Lengend Snippet: Photobiomodulation parameters to be used in the study.

Article Snippet: Patients will receive a maximum of 5 post-surgical treatment sessions of active PBMT (intervention: LED therapy: DUO 240 [red at 660nm and near-infrared at 840nm] applied parallel to the abdominal incision scar, followed by BIOFLEX LDR-100 laser probe (660nm red light) and the LD1-200 laser probe (825nm near-infrared light), applied at the incision wound edges) or non-effective doses of LED array and laser therapy (placebo), 4–6 hrs post-CS, and at 8am and 7pm of postoperative days 1 and 2.

Techniques: Produced, Irradiation