We propose and demonstrate a high performance four-wavelength erbium-doped fiber laser (EDFL), enabled by figure-8 compound-ring-cavity (F8-CRC) filter for single-longitudinal-mode (SLM) selection polarization-managed four-channel (PM-FCF) defining four lasing wavelengths. introduce novel methodology utilizing signal-flow graph combined with Mason's rule to analyze CRC in general apply it obtain the important design parameters F8-CRC used this paper. By combining functions of PM-FCF assisted...

We propose and demonstrate a four-wavelength-switchable erbium-doped fiber laser (4WS-EDFL) with four-channel superimposed high-birefringence Bragg grating (SI-HBFBG) dual-coupler ring based compound-cavity (DCR-CC) filter. Both for the first time, SI-HBFBG as reflective filter is used in multi-wavelength switchable to define wavelength channels DCR-CC select single mode from dense longitudinal-modes laser. present detail how design, fabricate, characterize both theoretical analysis...

Mode-order converters, transforming a given mode into the desired mode, have an important implication for multimode division multiplexing technology. Considerable mode-order conversion schemes been reported on silicon-on-insulator platform. However, most of them can only convert fundamental to one or two specific higher-order modes with low scalability and flexibility, between cannot be achieved unless total redesign cascade is carried out. Here, universal scalable converting scheme proposed...

Bragg-gratings have been frequently used to design compact and high extinction ratio (ER) on-chip polarizers. However, the strong reflection of unwanted polarization may deteriorate performance light source or cause interferences. In this paper, we propose a Bragg-grating-based all-silicon TM-pass polarizer with low reflection, insertion loss (IL) ER. Unlike previously reported polarizers based on single mode waveguides, construct Bragg grating multimode waveguide, which not only acts as...

On-chip silicon polarizers with broad operating bandwidth and compact footprint have recently attracted increasing attention for their applications in large capacity high density integrated optical systems. However, strong waveguide dispersion usually limits the of polarizers, especially TM-pass polarizers. In this paper, we overcome limit TM polarizer by utilizing a novel structure composed two weakly coupled nanowires gratings sandwiched between. Such can effectively enlarge bandgap...

A TM polarizer working for whole optical communication bands with high performance is proposed on a 220-nm-thick silicon-on-insulator (SOI) platform. The device based polarization-dependent band engineering in subwavelength grating waveguide (SWGW). By utilizing an SWGW relatively larger lateral width, ultra-broad bandgap of ∼476 nm (1238 nm-1714nm) obtained the TE mode, while mode well supported this range. Then, novel tapered and chirped design adopted efficient conversion, which results...

We describe a first distributed polarization analysis (DPA) system using binary rotators in an optical frequency domain reflectormeter (OFDR) capable of measuring the variations states along single-mode fiber (SMF). demonstrate such DPA to accurately measure distance-resolved birefringence with 12 loops different radii values length SMF and obtain bending-induced coefficient (BBC) 6.601 × 10-10 m2, agreeing well theoretically estimated value 5.334 m2. To further verify measurement accuracy,...

An ultracompact and highly flexible mode-order conversion scheme by exploiting reciprocal mode transitions is proposed investigated in detail, where an inverse/asymmetric input taper asymmetric output are introduced at both ends of a subwavelength gratings (SWGs) waveguide, respectively, to form two transition configurations. For given TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">p</sub> mode, it gradually transited into single-mode-like...

We present what we believe is the first report on a polarization-insensitive 3 × silicon star-crossing utilizing composite subwavelength metamaterial waveguide structure. Two different types of grating metamaterials (nanohole and fan-shaped bent grating) are respectively used to address diffraction issues in crossing region mode interference caused by compact non-adiabatic design. This approach results device with an ultra-compact footprint 12.68 10.98 µm 2 standard 220 nm...

A compact and broadband polarization rotator (PR) for silicon-based cross-slot waveguides using subwavelength gratings (SWGs) is proposed analyzed. To significantly break the symmetry of waveguide structure, diagonal regular Si wires are replaced with full etching SWGs. Moreover, special properties SWGs-whose effective index adjustable-can effectively enhance modal birefringence between two lowest-order hybrid modes, resulting in a more device. By utilizing interference effect both...

Optical power splitters (OPSs) are essential components in the photonic integrated circuits. Considerable splitting schemes have been reported on silicon-on-insulator platform. However, corresponding device lengths enlarged, and polarization-sensitive operations usually encountered when channels increased from two to five. In this paper, a novel model is proposed overcome these limitations. Here, fan-out bending subwavelength grating (FBSWG) metamaterials instead of classical straight SWGs...

Mode filters are fundamental elements in a mode-division multiplexing (MDM) system for reducing modal cross-talk or realizing routing. However, the previously reported silicon mode can only filter one specific at time and multiple modes filtering usually needs cascade of several filters, which is adverse to highly integrated MDM systems. Here, we propose unique concept realize compact, scalable flexible based on backward conversion gratings elaborately embedded multimode waveguide. Our...