Instead of a 45/spl deg/ mirror generally used as a reflective mirror for multimode applications, we propose a bulk-type curved mirror (BCM) with low loss. The BCM structure is designed and simulated by the ray tracing method. The coupling loss of the BCM fabricated by X-ray lithography is observed to be as low as 0.33 dB.
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Han et al. (2004) studied this question.
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