Optical packet networks have the advantages of high efficiency and transparency. It can take care of a
heterogeneous mix of traffic. We demonstrated bit-rate and signal-format transparent operations of an all-optical
packet-switched network.
An optical fiber loop memory can be used in a packet switched optical network to resolve the contention problems and increase the system flexibility. We report a multi- wavelength optical fiber loop memory with in-loop waveguide grating router. Bit error rate of stored packets is analyzed both experimentally and theoretically. A new refreshable multi-wavelength loop memory configuration is proposed and experimentally demonstrated. With this refreshable optical memory, which works like a DRAM (dynamic random access memory), optical signal can be stored as long as system required.
Jem Fan, Xiangjun Zhao, Jun Zhang, Fow-Sen Choa, Yanjie Chai, Jye-Hong Chen, E. Miller, Howard Motteler, Pao-Lo Liu, Tawee Tanbun-Ek, Patrick Wisk, Won-Tien Tsang, George Zydzik, Charles Burrus
We report a new generation switch, the data-block switch, which can greatly increase the capacity and reduce the complexity of the interconnect network of a parallel computing system. By using WDM techniques, parallel data can be multiplexed and transmitted through a single fiber. By using photonic switching techniques, we can switch a block of parallel data in one switch operation to any site desired. In this work, we demonstrate such an operation with our fabricated 1 X 2 semiconductor optical amplifier (SOA) switch. This integrated device is an active/passive Y- junction waveguide device with a passive waveguide region in the middle and 3 active waveguide regions at each end. The amplified spontaneous emission spectrum of the SOA shows that this broadband switch can easily cover a wavelength range of more than 64 ITU wavelength grids (100 GHz). The switch operation of multiple wavelengths and the switching speed of the device were studied. A switching time of around 400 ps was achieved.
A strongly coupled external cavity semiconductor laser with stable frequency operation is reported in this paper. The typical linewidth, maximum tuning range and side-mode suppression ratio of the device are 100 kHz, 120 nm and 35 dB, respectively. The operation frequency is quite stable because of adopting strong external cavity feedback, temperature compensation cavity structure and double-stage temperature control. With the aid of active frequency control loop the frequency shift can be limited within several MHz over 24 hours. More than twenty tunable narrow-linewidth external-cavity semiconductor lasers have been developed in China.
Frequency of two distributed feedback laser diodes (DFB LD) are relatively stabilized using a scanning Fabry-Perot Interferometer as a frequency reference, with 10 GHz spacing within 50 MHz fluctuation.
Frequencies of three 1.52 micrometers external cavity semiconductor lasers were locked to the peaks of a F-P etalon with 4.8 GHz frequency span. The frequency fluctuation between the adjacent channels was less than 10 MHz for long period of observation with laser linewidth of 60 kHz.
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