Ibrahim Murat Soganci

Monolithically Integrated InP 1

The static and dynamic characteristics of a monolithically integrated InP 1 × 16 optical phased-array switch are presented. The device demonstrates static switching with an average extinction ratio of 18.6 dB, on-chip loss below 7 dB, and wavelength dependence of less than 0.8 dB in the entire C-band. A 40-Gb/s nonreturn-to-zero signal is transmitted through the switch with a power penalty below 0.4 dB. Using a programmable electronic circuit, dynamic switching to all 16 outputs is achieved with response times less than 11 ns.

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Optical buffering has been one of the major technical challenges in realizing optical packet switching (OPS) routers. While fiber-delay-line-based (FDL) buffers are the most practical and realistic solution to offer useful amount of capacity, the bulkiness of long FDLs and optical switches has been the main obstacle to practical implementation. This paper demonstrates a compact optical buffer with up to 750-ns capacity and 50-ns temporal resolution by using an InP integrated 1×16 optical phased-array switch and compact FDL module based on thin-cladding highly nonlinear fiber (HNLF). Owing to the high mode confinement inside HNLF, 15 fibers with the total length of 1.2 km are coiled onto a single bobbin with a coin-sized footprint without increasing the propagation loss. At the interface between the InP switch and FDLs, a pitch-converting silica planar-lightwave circuit chip is employed to achieve 16-port simultaneous uniform interconnection. Using the developed module, variable optical buffering experiment is demonstrated, where the packet intervals are expanded from 20 to 70 ns successfully.

16 Optical Switch With Wavelength-Insensitive Operation

A photonic integrated circuit capable of 1×100 switching is reported. The switch, incorporating more than 250 photonic components along with numerous passive waveguides and bends, demonstrates power penalty < 1 dB at 10 Gbps and extinction ratio > 50 dB.

Large-Capacity Compact Optical Buffer Based on InP Integrated Phased-Array Switch and Coiled Fiber Delay Lines

An InP/InGaAsP integrated 1 times 8 optical phased-array switch is designed, fabricated, and characterized for high-throughput broadband wavelength-division multiplexed (WDM) optical packet switching application. With a single stage of phase shifters utilizing carrier-induced refractive index change, switching to the eight output ports is demonstrated successfully. The polarization-dependent loss is 2.2 dB in the worst case, and the wavelength-dependent loss is less than 2.5 dB across the entire C-band (1520-1580 nm) with the average extinction ratio of 17.7 dB. The measured reconfiguration time is shorter than 6 ns. Low-penalty transmission of a 40-Gb/s non-return-to-zero signal is also demonstrated for the first time. These features make the integrated phased-array switch an attractive candidate to be deployed in the future high-capacity optical packet switching networks.

Monolithic InP 100-port photonic switch

Integrated InP/InGaAsP phased-array 1×16 optical switch is fabricated and characterized for broadband WDM optical packet switching. Wavelength-insensitive operation covering the C-band and penalty-free transmission of 40-Gbps signal are demonstrated.

Integrated 1

1 × 8 and 1 × 16 optical packet switching (OPS) node subsystems are demonstrated. The OPS node consists of a 1 × N monolithically integrated InP optical phased-array switch, an electronic switch controller, and a label extractor/eraser that utilizes cascaded reflective fiber Bragg gratings. In-band parallel labels are employed to encode the address information. 160-Gb/s optical time-domain-multiplexed packets are dynamically switched to 8 and 16 outputs with power penalties of 0.5 and 0.7 dB, respectively.

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We demonstrate large-capacity high-resolution optical buffer, comprising 1 × 16 InP switch and ultra-compact delay lines based on thin-cladding highly nonlinear fibers. Silica-PLC-based pitch converter is employed to realize uniform coupling from all 16 switch ports simultaneously.

8 Optical Phased-Array Switch With Low Polarization Sensitivity for Broadband Optical Packet Switching

An InP/InGaAsP 1×8 optical phased-array switch is designed, fabricated, and demonstrated for the first time. The device demonstrates successful operation in the entire C-band (1520–1580 nm) for both the TE- and TM-polarization states.

Integrated phased-array 1×16 photonic switch for WDM optical packet switching application

We demonstrate a 1}16 optical packet switch sub-system for 160 Gbps RZ-OOK and 12}10 Gbps multi-wavelength DPSK packets. We show error-free operation with maximum penalties of 0.7 dB for 160 Gbps RZ-OOK and 0.6 dB for multi-wavelength DPSK packets.

160-Gb/s Optical Packet Switching Subsystem With a Monolithic Optical Phased-Array Switch

Novel type of wavelength-insensitive monolithically integrated InP 1×N switch is developed using optical phased-array architecture. Low-polarization-dependent 1×8 switch, 1×16 switch, and application to 320-Gbps WDM optical packet switching are demonstrated.