An innovative overlapped-subcarrier multiplexing (O-SCM) technique is proposed for wavelengthdivision multiplexed (WDM) passive optical networks (PONs).Allowing a certain amount of spectral overlap between the uplink and the downlink maximizes the spectrum usage of bandwidth-limited reflective semiconductor optical amplifier (RSOA)-based optical network units (ONUs), while reducing the effect o...

The optical phase conjugation (OPC) process is thoughtfully investigated in a nonlinear bidirectional semiconductor amplifier subsystem (SOA), demonstrating the conversion through two ports of SOA, simultaneously. spectral responses, power curves and quality optimization conjugated are discussed simulation configuration. experimental investigation polarization-insensitive SOA further confirms O...

In this paper, considering optical feedback as an optical injection, and taking in to account round-trip time role in the external cavity, a standard small signal analysis is applied on laser rate equations. By considering the relaxation oscillation (f2) and external cavity frequencies (f) ratio for semiconductor laser, field amplitude response gain, optical phase and carrier number for long ex...

We report a compact light source that incorporates a semiconductor light-emitting diode, nanostructured distributed feedback (DFB) Bragg grating and spin-coated thin conjugated polymer film. With this hybrid structure, we transferred electrically generated 390 nm ultraviolet light to an organic polymer via optical pumping and out-couple green luminescence to air through a second-order DFB grati...

The bandwidth and performance of optical phase-lock loops (OPLLs) using single-section semiconductor lasers (SCLs) are severely limited by the nonuniform frequency modulation response of the lasers. It is demonstrated that this restriction is eliminated by the sideband locking of a single-section distributed-feedback SCL to a master laser in a heterodyne OPLL, thus enabling a delay-limited loop...

We study optical-feedback effects using an integrated laser-modulator/amplifier. Our experiment and theory are agree well and provide interesting results of feedback effects on optical spectrum, spatial-hole burning, the photon density profile, and the microwave modulation. OCIS codes: (140.3430); (230.3120)

In this paper, we present current amplifier based transimpedance (TIA) for biosensor applications. Proposed design has low-noise, high Transimpedance gain that can be used low measurement The TIA is implemented in order to resolve the fabrication issues related value feedback resistor. design, input block a amplitude amplifier. designed 90 nm complementary metal-oxide semiconductor (CMOS) techn...

We demonstrate a generation of three lasing wavelengths with the assistance Rayleigh backscattering as stabilizer peak power variations. The proposed laser consists combination semiconductor optical amplifier (SOA) and erbium-doped fiber (EDFA) amplifying media. Three Bragg gratings are employed selective wavelength selectors at 1544, 15747 1550 nm. At 110 mA SOA current 18 dBm EDFA output powe...