Ntt Electronics Corporation

Nippon Telegraph and Telephone Corporation

Mitsuru Nagano

Masahiro Yanagisawa

Takanori Ishikawa

Tomoyo Shibazaki

Toshio Watanabe

Takayuki Mizuno

Hiroshi Terui

Mikitaka Itoh

Takashi Goh

Masayuki Okuno

Shunichi Soma

Tomoyuki Yamada

Akira Himeno

Akimasa Kaneko

Yasuaki Hashizume

Atsushi Murasawa

Daisuke Ogawa

Mikitaka Ito

Tatsunori Nakahashi

Akihito Doi

Akira Nagai

Tatsuya Yoshii

Masahiko Naito

There is provided a small MCS with the number of leads reduced by half as compared with the conventional configuration. A multicast switch according to the present invention is formed on a substrate, comprising: M input ports, N output ports; M&#xd7;N optical switch units (optical SU); optical waveguides optically connecting the M input ports, M&#xd7;N optical SU, and N output ports; and leads connected to the respective M&#xd7;N optical SU. A multicast switch is configured such that by activating one optical SU, an optical signal input to an input port associated with the activated optical SU is output from an output port associated with the activated optical SU. The M&#xd7;N optical SU include at least a gate switch and a main switch. In each optical SU, the gate switch and the main switch are connected to the common lead.

Multicast switch

In a waveguide device, unnecessary optical power is appropriately terminated. According to an embodiment of the present invention, the waveguide device has a termination structure filled with a light blocking material to terminate light from a waveguide end. In the termination structure, a cladding and a core are removed to form a groove on an optical waveguide. The groove is filled with a material (light blocking material) that attenuates the intensity of light. Thus, light input to the termination structure is attenuated by the light blocking material, suppressing crosstalk which possibly effects on other optical devices. Thus, such a termination structure can restrain crosstalk occurred in optical devices integrated in the same substrate and can also suppress crosstalk which possibly effects on any other optical device connected directly to the substrate.

Optical waveguide device and module

Excess optical power in a waveguide device is appropriately terminated. According to one embodiment of the present invention, the waveguide device comprises a termination structure filled with a light blocking material for terminating light from the end section of a waveguide. This termination structure can be formed by forming a groove on an optical waveguide by removing the clad and core, and filling the inside of that groove with a material attenuating the intensity of the light (light blocking material). In this manner, light that enters into the termination structure is attenuated by the light blocking material, and influence on other optical devices as a crosstalk component can be suppressed. With such termination structure, not only the influence on optical devices integrated on the same substrate, but also the influence on other optical devices directly connected to that substrate can be suppressed.

Waveguide device and module

A planar optical waveguide including a clad layer, an optical waveguide having a core embedded in the clad layer; and a groove formed in the clad layer and having a reflection interface for totally reflecting a leaked light leaked from the optical waveguide to the clad layer. Since the reflection interface for totally reflecting the leaked light is formed in the clad layer, the leaked light is prevented from entering into the tap coupler, and the variation of the branching ratio can be reduced.

Planar optical waveguide

Two AWG circuits are integrated while preventing degradation in quality of a multiplexing/demultiplexing function. An arrayed waveguide grating circuit includes: a first slab waveguide () connected to a first input waveguide () and second output waveguides (); a second slab waveguide () connected to first output waveguides () and a second input waveguide (); and an array waveguide () connecting the first slab waveguide () and the second slab waveguide (), wherein the input waveguides () are connected to the slab waveguides () at an interval of 1.5&#xd7; from the outermost second output waveguide out of the second output waveguides () connected at an interval x depending on a wavelength.

Arrayed waveguide grating circuit

Growing community of inventors

Yokohama, Japan

Mitsuru Nagano