The investigation of optical coupling of microlasers with tapered fiber

We present an investigation of optical coupling of injection microdisk and microring lasers with different diameters with a tapered fiber. We studied the dependences of the laser dominant mode intensity on the distance between the tapered fiber and the microlaser’s sidewall. For every studied laser a sharp intensity growth by 2–3 orders of magnitude was observed when the tapered fiber came in contact with the microlaser. We compared lasing spectra received by the tapered fiber and by the microobjective. Though the intensity of the electroluminescence signal received by the tapered fiber was lower than that coupled by the microobjective, the ratio of the dominant (lasing) mode intensity to spontaneous emission was noticeably higher for the case of the tapered fiber.