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US4658224A
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Method and apparatus for increasing the bandwidth of a high speed modulator
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1984-09-21
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Granted: 1987-04-14
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Expires: 2004-09-21
Abstract
Abstract A method of increasing the available bandwidth of a high speed modulator in which an optical signal is modulated by a microwave signal (v) along an interaction distance (L). After passing half the interaction distance (L/2) the modulating signal is pole reversed by a positive (+E) and a negative (-E) bias voltage being connected to two different sections of the interaction distance. An apparatus according the method in an optical directional coupler modulator is described.
Inventors
- 👤 Lars H. Thylen
- 👤 Anders G. Djupsjobacka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:48
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/29; G02F1/31; G02F1/313; G02F1/3132; G02F1/3134; G02F1/01; G02F1/03; G02F1/035; G02F1/0356
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
190 words
Wide-band high-speed modulator of the traveling wave type comprising: a substrate; two parallel planar wave conductor means disposed on said substrate, one of said conductor means being a continuous metallic conductor, the other of said conductor means being two distinct metallic conductors in axially aligned relationship; coupling means for AC coupling but DC isolating said two distinct metallic conductors; means for applying a positive bias voltage to a first of said distinct metallic conductors; means for applying a negative bias voltage to a second of said two distinct metallic conductors; load means for connecting the end of one of said two distinct metallic conductors remote from said coupling means to the end of said continuous metallic conductor adjacent thereto; means for applying a microwave signal across the end of the other of said metallic conductors remote from said coupling means and the end of said continuous metallic conductor adjacent thereto; a first optical conductor disposed adjacent and parallel to one of said conductor means for guiding an optical signal; and a second optical conductor disposed adjacent and parallel to the other of said conductor means for guiding an optical signal.
Claim 2
Dependent Claim
190 words
Wide-band high-speed modulator of the traveling wave type comprising: a substrate; two parallel planar wave conductor means disposed on said substrate, one of said conductor means being a continuous metallic conductor, the other of said conductor means being two distinct metallic conductors in axially aligned relationship; coupling means for AC coupling but DC isolating said two distinct metallic conductors; means for applying a positive bias voltage to a first of said distinct metallic conductors; means for applying a negative bias voltage to a second of said two distinct metallic conductors; load means for connecting the end of one of said two distinct metallic conductors remote from said coupling means to the end of said continuous metallic conductor adjacent thereto; means for applying a microwave signal across the end of the other of said metallic conductors remote from said coupling means and the end of said continuous metallic conductor adjacent thereto; a first optical conductor disposed adjacent and parallel to one of said conductor means for guiding an optical signal; and a second optical conductor disposed adjacent and parallel to the other of said conductor means for guiding an optical signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-13 | 1990-10-13 | 1991-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-13 | 1994-10-13 | 1995-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-13 | 1998-10-13 | 1999-04-14 | $7700.00 | Window Closed / Lapsed |