| 摘要 |
<p>A design of expanded-beam type wavelength multiplexer or channel drop and insert filter using oblique light incidence upon a concatenation of substrate (18,38) mounted dielectric filters (24,44) involves mounting the beam-expanding graded-index lenses (20) in pre-aligned V-grooves (22), and only later securing optical fibres (10 to 15, 30 to 33) to those lenses. This approach simplifies component alignment problems by reducing the number of degrees of freedom and, by virtue of the fact that the mechanical design allows implementation using minimal amounts of adhesive, provides long-term stability of optical performance. <IMAGE></p> |
