International Joint Workshop on OCDMA and OPS 2007
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英文:
NiCT, Koganei HQ
アブストラクト
An optical label switch is expected to overcome present issues of electronic routers such as operation speed, processing latency, and power consumption. Optical label processing is one of the most important functions, and their main concept is to introduce optical passive devices to reduce number of active components and processing step counts. In several schemes demonstrated, we have investigated a label processor using an optical digital-to-analog converter (ODAC). This is one of the bit-serial schemes, and it converts several serial bits to one bit with multi-level amplitude. Amplitude of converted signal is discriminated by comparators with different threshold levels in parallel. Only one bit signal is used for recognition at the label recognition stage, and resultant reduction of processing step counts. In addition, it has the advantage of small number of optical devices by dealing with several bits at one time.
In this presentation, I will report on 40Gbps operation of an ODAC and its application to optical label processing for optical packet switches. The semiconductor ODAC has high mesa structure consisting of InGaAsP core region sandwiched between upper and lower InP cladding layer. It is composed of two 1x2 MMI couplers and one-bit delay line with the length of 2366mm. We successfully observed multi-level analog output signal for 40Gbps two-bit NRZ label.
Moreover, by broadening high-speed output analog signal to low-speed electrical signal with an OE converter and a low pass filter with the bandwidth of 500MHz, discrimination of multi-level output signals could be achieved, and address table signal could be read-out.
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