1988-11-14
1990-12-11
Bovernick, Rodney B.
3501622, G02B 518
Patent
active
049765132
ABSTRACT:
A tunable wavelength filter comprises a plurality of distributed feedback sections and a phase-control section provided between the distributed feedback sections. The bandgap energy of the phase-control section is greater than that of the distributed feedback sections. In the tunable wavelength filter, electric current injected into the phase-control section is controlled to vary the optical length, so that light having a predetermined wavelength is transmitted through the tunable wavelength filter.
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Bovernick Rodney B.
NEC Corporation
Nguyen Thong
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