No, not based on this dataset. Filing peaked in 2018 at 14 families and had fallen to just 1 by the 2022 midpoint, indicating a clear multi-year decline rather than continued growth. The most recent years appear lower still, but that is partly an artefact of publication lag, since patent applications typically take around 18 months to publish after filing. The honest read is a field where the core architecture was staked out between roughly 2017 and 2019, with filing activity cooling substantially since.

The dataset's named leaders include NTT, Huawei, Nokia (via its Alcatel-Lucent lineage), Corning, Juniper Networks and Ericsson, but all of them show zero filings in the latest tracked year. Co-assignee data shows NTT paired with its own NTT Electronics subsidiary as the strongest filing link in the corpus, suggesting internal group filing practice more than external partnership. No single company shows a dominant current filing rate; the field looks like several long-established filers holding existing portfolios rather than one clear active leader.

H04B, the general transmission subclass, appears in 77 of the 87 records in this dataset and carries the bulk of the claim language around symbol timing, carrier recovery and channel monitoring. H04J (multiplex communication) and G02B (optical elements and systems) are meaningful secondary classes, while H01S (lasers) and G02F (optical modulation) support the optical hardware side. Narrower classes like H03C and H03K appear in only 2 records each, which points to those being addressed as dependent claims rather than pursued as standalone filing strategy.

US10110320B2, assigned to Juniper Networks and granted in 2018, claims an apparatus that calculates spacing between adjacent optical channels from digital samples taken at a coherent optical receiver, using that calculation to monitor and correct adjacent-channel penalty. It is specific to a monitoring-and-correction function built on digital signal processing of channel spacing, not to coherent detection generally. A new design that avoids per-channel spacing calculation for adjacent-channel penalty correction, or that solves channel monitoring through a materially different signal path, would sit outside its claim scope, but any implementation using this exact spacing-based correction approach should be checked against it carefully.

The clearest gaps sit outside the dense H04B and H04J core: modulation-format auto-identification, pulse-technique synchronization circuits (H03K, only 2 records), and self-homodyne carrier-multiplexed transmission architectures all show comparatively light claim coverage in this dataset. Nonlinear impairment compensation via digital signal processing is referenced in the search criteria but is not saturated with claims the way symbol timing recovery is. Given the overall filing slowdown since 2018, any of these sub-areas would need a genuinely narrow, technically specific first claim rather than a broad architectural one, since the broad architecture space was largely claimed years ago.