We have developed fully non-blocking optical matrix switches using a thermo-optic polymer 1 × 2 total-internal-reflection (TIR) switch as unit switching element. The TIR consists of crossed multimode waveguides and an offset heater electrode at the node. fabricated 4 8 chips show excellent performances. insertion losses are less than 2.5 4.5 dB for switches, respectively, their isolations during turned-off state higher 38 dB. time is about 3 ms, power consumption each element below 30 mW....

Air-suspended membrane-type photonic crystals were fabricated in polystyrene. The two-dimensional crystal slab nanostructures replicated by a thermal nanoimprint process, and then air-suspended membrane structures generated selective sacrificial layer etch process. optical transmission showed clear band gap characteristics at 1550nm wavelength, which is good agreement with the theoretical calculations.

Very compact 4-channel 200-GHz-spacing external cavity lasers (ECLs) were fabricated by hybrid integration of reflection gratings and superluminescent laser diodes on a planar lightwave circuit chip. The fifth-order as formed using conventional contact-mask photo-lithography process to achieve low-cost fabrication. lasing wavelength the ECLs matched ITU grid with an accuracy ×0.1 nm, optical powers more than 0.4 mW at injection current 80 mA for all channels. showed single mode operations 30...

We present a 10-channel polymer thermo-optic digital optical switch (DOS) array with very low crosstalk. The DOS has crosstalk-improved structure in which radiation-type attenuators are integrated series conventional 1 times 2 DOS. It is fabricated using quartz substrate on grid patterns for dispersion of stray light formed to reduce the measured crosstalk values as -45 dB at electrical power 50 mW. Insertion losses less than 1.35 achieved all channels.

We present a cost-effective 25-Gb/s electro-absorption modulator integrated laser (EML) transmitter optical sub-assembly (TOSA) using all-in-one flexible printed circuit board (FPCB) wiring and metal bench (MOB). For low cost high bandwidth TOSA, internal external wirings feed-through of the TOSA to transmit radio-frequency (RF) signal are configured FPCB. The FPCB is extended from an exterior package up EML chip inside through slit formed on rear sidewall die-bonded MOB. shows modulated...

We have fabricated a planar lightwave circuit (PLC) hybrid-integrated optical sub-assembly of triplexer using thin film filter (TFF)-attached wavelength division multiplexer (WDM) and photodiode (PD) carriers. Two types TFFs were attached to diced side silica-terraced PLC platform, the PD carriers with 45° mirror on which pin-PDs bonded assembled platform. A clear transmitter eye-pattern minimum receiver sensitivity -24.5 dBm obtained under 1.25 Gb/s operation for digital applications,...

This letter presents a polymer 1×2 thermo-optic total-internal-reflection digital optical switch (TIR-DOS) with an index contrast of 1.5%-Δ operating at low power consumption. The structure our TIR-DOS was created by adding reflection port to that conventional multimode filtering variable attenuator. To improve the efficiency, heater offset applied crossing region waveguides TIR-DOS. fabricated shows electrical consumption 18 mW for on-off ratio 35 dB.

An optical triplex transceiver (TRx) module, which consists of thin-film filter (TFF)-attached wavelength-division multiplexer (WDM) and photodiode (PD) carriers, has been fabricated using a silica planar lightwave circuit (PLC) hybrid integration technology. Two types TFFs were attached to diced sidewall silica-terraced PLC platform realize the TFF-attached WDM. The PD carriers with 45deg mirror, on receiving surface-illuminated PDs bonded, assembled form receiver (Rx) parts. As main...

We present a novel 2 × polymer thermo-optic digital optical switch (DOS) using the total-internal-reflection (TIR) effect. The consists of four 1 TIR-DOSs cascaded with each other. These have two branched multimode waveguides and an offset heater electrode in region. Our does not any bent waveguides, has tapered single-mode only input-output fiber coupling fabricated exhibit excellent properties, very low insertion losses <; 1.4 dB switching isolations >; 50 both turned-off turned-on states.

We describe a hybrid integration module of 10 × 10-Gb/s distributed feedback laser diode array (DFB-LDA) and planar light-wave circuit-based arrayed waveguide grating (AWG). For fabrication the DFB-LDA, we adopted selective area growth technique to tailor channel gain properly, E-beam lithography accurately control lasing wavelength phase. implementation AWG, introduced 2%-Δ structure reduce coupling loss between AWG designed tapered parabolic waveguides at junctions free propagation regions...

A compact-size and low-cost tunable external cavity laser transmitter optical sub-assembly with butt-coupled superluminescent diode polymer Bragg reflector (PBR) is described. The output wavelength of the widely tuned over 16 nm by a heater PBR finely phase PBR. threshold current power slope are 8 mA 0.117 W/A, respectively, at temperature 25 <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex...

We have developed a polymer-based optical switch with low loss and power consumption for future metro-area networks, considering the cost-effectiveness productivity. For that, low-cost spin-coating process of shallow ridge polymer waveguide flip-chip bonding technology been employed in switch.

In this paper we report the results on optimization of bi-layer lift-off resist (LOR) SiO₂ sputter-deposition technique which is ideal for obtaining damage-free multi-electrode array (MEA).

A 1.5%-/spl Delta/ silica directional coupler-type wavelength-division multiplexer dividing 1310/1550-nm wavelength bands was used to develop a bidirectional optical transceiver module. The active devices such as spot-size converted Fabry-Pe/spl acute/rot laser diode and waveguide photodetectors were hybridly integrated on silica-terraced planar lightwave circuit platform. As main performances of the module, clear eye pattern minimum receiver sensitivity -25.5 dBm obtained under full duplex...

This letter presents a crosstalk-enhanced polymer thermo-optic digital optical switch operating at low power consumption. Modified radiation-type attenuators are integrated in series with conventional 1 × 2 switch. A crosstalk of less than −45 dB is attained applied switching 60 mW, and an insertion loss about 1.1 exhibited.

A practical optical rotary joint and links were prepared for an antenna measurement. The rotational variation loss of the depends on mechanical misalignments. To achieve 0.2 dB or less loss, we proposed a new structure that has noncontact interface using two size-mismatched fibers without lens. are made distributed-feedback laser diode, PIN-photodetector, single-mode fiber jumper cords. very low loss. sufficiently stable to be applied We verified can adopted in RF test applications.

We present a cost-effective dual polarization quadrature phase-shift coherent receiver module using silica planar lightwave circuit (PLC) hybrid assembly. Two beam splitters and two 90° optical hybrids are monolithically integrated in one PLC chip with an index contrast of 2%-Δ. four-channel spot-size converter waveguide-photodetector (PD) arrays bonded on PD carriers for transverse-electric/transverse-magnetic polarization, butt-coupled to polished facet the simple chip-to-chip bonding...

A spot-size converted Fabry-Perot laser diode (LD) was flip-chip bonded to a silica-terraced planar lightwave circuit (PLC) platform examine the effect of silica terrace on heat dissipation LD module. From measurement light-current characteristics, it discovered that itself is not strong thermal barrier, but encapsulation integrated with an index-matching polymer resin more or less deteriorates dissipation.

A high-speed waveguide photodetector has been successfully fabricated for an integrated coherent receiver. Dual laterally tapered structures are introduced a spot-size converter. We optimize the responsivity and polarization-dependent loss of converter-integrated through beam propagation method simulation. The is designed with electrical as well optical optimizations. provides sufficient alignment tolerance, high 0.73 A/W, low 0.27 dB, which in good agreement simulation results. By...

With hybrid integration of SOA and lensed PIN-PD chips on a silica-based AWG platform, we have developed novel compact 100G-ER4 ROSA for QSFP28 transceivers with sensitivities below −27 dBm at BER 1×10−12

A temperature and polarization-insensitive arrayed waveguide grating (AWG) multiplexer was realized by forming a polymer overcladding with negative thermo-optic coefficient on the silica core undercladding without deteriorating loss crosstalk characteristics of original AWG multiplexer.