This letter presents a novel design for 3-D-printed circular waveguide dual-mode (CWDM) filter with modified cavity shape. The modification leads to wide spurious-free stopband, which is highly desirable channel separation in contiguous output multiplexers (OMUXs) satellite communication systems. new resonant result of applying shape deformation basic order move away and suppress parasitic mode...

Monolithically integrated four-channel distributed feedback (DFB) laser array has been fabricated by metal organic vapor phase epitaxy (MOVPE) selective area growth for 1.55μm coarsewavelength division multiplexing (CWDM) systems. Wide-stripe MOVPE selective area growth and electron-beam lithography are used to obtain wide CWDM channel spacing of 20 nm. Optical outputs from the simultaneously b...

AIM  To describe to the new generation of otologists the origins of mastoidectomy as well as the difficulties our predecessors encountered and the solutions they devised to improve otologic surgery. METHOD  Retrospective literature review-based study. RESULTS  Before the mid-19th century, mastoidectomy was performed only sporadically and in most cases as a desperate attempt to save the live...

Introduction  Chronic otitis media can cause multiple middle ear pathogeneses. The surgeon should be aware of relation between ossicular chain erosion and other destructions because of the possibility of complications. Objective  This study aimed to investigate the rates of ossicular erosion in cases of patients with and without facial nerve canal destruction, who had undergone mastoidectomy du...

Abstract Background Granulation tissue (GT) formation is a complication of otologic surgeries. We aimed to assess the rate GT following these procedures and their outcome. Methods This cross-sectional study was performed from 2015 2019. Patients who underwent tympanomastoidectomy (either CWD or ICW) stapedotomy were included. Demographic other related data gathered. Four weeks after surgery, pa...

286 Two patients who had been previously treated with radical mastoidectomy procedure were found to have an abnormal small cavity due to a soft, tumor like tissue obstructing the entrance of mastoidectomy cavity on follow-up examination. These tissues were easily perforated by simple instrumentation and observed to be an epithelium with varying thickness. Histologic examination revealed granula...

Introduction Posterior tympanotomy approach for cochlear implant (CI) surgery, has been the most commonly used worldwide with current 0.7% rate of facial nerve injury. Non-mastoidectomy CI approaches include the suprameatal approach (SMA) and its modifications, the transcanal approach and its modifications and the pericanal approach for electrode insertion. Objectives The objective of this stud...

Abstract Objectives The study's primary objective was to compare the quality of life (QoL) and external auditory canal (EAC) hygiene among patients who underwent bony mastoid obliteration or meatoplasty after wall down (CWD) mastoidectomy. Methods A prospective, observational, controlled cohort study conducted at our tertiary referral university hospital. Twenty‐eight older than 16 years age wi...

-We present modeling and simulation results for an echelle grating for CWDM system. The design incorporate 4 wavelength channels at 1.55 μ m with a spacing of 20nm. The on chip loss is about -3.5dB.

Abstract Background This study was designed to evaluate the effect of mastoid cavity obliteration with bone chips and reconstruction canal wall tragal cartilage after down tympanomastoidectomy ossiculoplasty in same session. Sixty-three patients cholesteatoma underwent technique mentioned above; were followed for 1 year postoperative. Results No problems, median preoperative air gap 32.86 ± 6.2...